WO2013143508A2 - Método para la detección, recuperación, identificación y enumeración simultánea de microorganismos y dispositivos para su ejecución - Google Patents
Método para la detección, recuperación, identificación y enumeración simultánea de microorganismos y dispositivos para su ejecución Download PDFInfo
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- WO2013143508A2 WO2013143508A2 PCT/CU2013/000002 CU2013000002W WO2013143508A2 WO 2013143508 A2 WO2013143508 A2 WO 2013143508A2 CU 2013000002 W CU2013000002 W CU 2013000002W WO 2013143508 A2 WO2013143508 A2 WO 2013143508A2
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
- C12Q1/02—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving viable microorganisms
- C12Q1/04—Determining presence or kind of microorganism; Use of selective media for testing antibiotics or bacteriocides; Compositions containing a chemical indicator therefor
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M25/00—Means for supporting, enclosing or fixing the microorganisms, e.g. immunocoatings
- C12M25/14—Scaffolds; Matrices
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M41/00—Means for regulation, monitoring, measurement or control, e.g. flow regulation
- C12M41/30—Means for regulation, monitoring, measurement or control, e.g. flow regulation of concentration
- C12M41/36—Means for regulation, monitoring, measurement or control, e.g. flow regulation of concentration of biomass, e.g. colony counters or by turbidity measurements
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
- C12Q1/02—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving viable microorganisms
- C12Q1/04—Determining presence or kind of microorganism; Use of selective media for testing antibiotics or bacteriocides; Compositions containing a chemical indicator therefor
- C12Q1/06—Quantitative determination
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
- C12Q1/02—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving viable microorganisms
- C12Q1/04—Determining presence or kind of microorganism; Use of selective media for testing antibiotics or bacteriocides; Compositions containing a chemical indicator therefor
- C12Q1/10—Enterobacteria
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
- C12Q1/02—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving viable microorganisms
- C12Q1/04—Determining presence or kind of microorganism; Use of selective media for testing antibiotics or bacteriocides; Compositions containing a chemical indicator therefor
- C12Q1/14—Streptococcus; Staphylococcus
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2333/00—Assays involving biological materials from specific organisms or of a specific nature
- G01N2333/195—Assays involving biological materials from specific organisms or of a specific nature from bacteria
- G01N2333/21—Assays involving biological materials from specific organisms or of a specific nature from bacteria from Pseudomonadaceae (F)
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2333/00—Assays involving biological materials from specific organisms or of a specific nature
- G01N2333/195—Assays involving biological materials from specific organisms or of a specific nature from bacteria
- G01N2333/24—Assays involving biological materials from specific organisms or of a specific nature from bacteria from Enterobacteriaceae (F), e.g. Citrobacter, Serratia, Proteus, Providencia, Morganella, Yersinia
- G01N2333/245—Escherichia (G)
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2333/00—Assays involving biological materials from specific organisms or of a specific nature
- G01N2333/195—Assays involving biological materials from specific organisms or of a specific nature from bacteria
- G01N2333/315—Assays involving biological materials from specific organisms or of a specific nature from bacteria from Streptococcus (G), e.g. Enterococci
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2333/00—Assays involving biological materials from specific organisms or of a specific nature
- G01N2333/37—Assays involving biological materials from specific organisms or of a specific nature from fungi
- G01N2333/38—Assays involving biological materials from specific organisms or of a specific nature from fungi from Aspergillus
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2333/00—Assays involving biological materials from specific organisms or of a specific nature
- G01N2333/37—Assays involving biological materials from specific organisms or of a specific nature from fungi
- G01N2333/39—Assays involving biological materials from specific organisms or of a specific nature from fungi from yeasts
- G01N2333/40—Assays involving biological materials from specific organisms or of a specific nature from fungi from yeasts from Candida
Definitions
- the present invention relates to the field of microbiology and more specifically to the detection and identification of microorganisms in different environments and samples.
- a significant number of conventional culture media and methods are known for the detection and identification of microorganisms, whose main or disadvantages consist of a prolonged period of incubation of the samples (minimum 18-24 h), cumbersome manipulation by using different means to isolate , enrich and identify bacteria and yeasts.
- silicate nanoparticles have, on the other hand, been used to inhibit microbial growth (Composition comprising aluminum silicates and silver nanoparticles as bactericides. WIPO patent application WO / 20 1/128488).
- the adhesion of the microorganisms depends on their concentration in the sample; at lower concentration, lower adhesion;
- the latter are not specially selected for their ability to rapidly promote their growth, and therefore at low concentrations they are not detected. or its detection is late with respect to the needs of the diagnosis;
- microorganisms such as yeasts, fungi, Gram positive and Gram negative bacteria, microbacteria and nanobacteria are not detected in unison;
- the objective of the present invention is to provide a new method for the simultaneous detection, recovery, identification and enumeration of a plurality of microorganisms in different samples and the devices for their execution.
- the novelty of the present invention is that:
- clays or ceramics that naturally have bactericidal, fungicidal or bacteriostatic activity, such as zeolite, bentonite, kaolinite, among others, without the need for a chemical modification for the promotion of microbial growth, because this inhibitory effect caused by the natural presence in them of "Toxic" ions for microorganisms is eliminated thanks to the absorption or adsorption of nutrient mixtures that are specially designed for each type of sample and each three-dimensional structure. Previous applications of these clays have been aimed at the elimination of bacteria;
- the use of a variety of natural or artificial clays or ceramics is combined in the same and single test method or in an individual or composite device, each providing different ions that selectively act as catalysts for specific enzymatic reactions of a species, genus or group of microorganisms and that, together with the nutrients and growth factors that provide the nutritional formulations chosen especially for promoting a short period of the lag phase and accelerating microbial growth and, unexpectedly made possible the detection, recovery, identification and / or enumeration of a plurality of microorganisms separately or within the same sample in a time as reduced as 60-90 min, previously not reached for the chromogenic or fluorogenic methods of microbial identification;
- some microorganisms such as certain species of Pseudomonas showed characteristics that do not commonly show in certain media, for example, when using siliceous soil with the nutritive composition Pseudomonas developed fluorescence in just 120 min, when in the culture media tested containing this compound, fluorescence appears only after 18 h;
- Ipomoea sweet potatoes tomato extract; papain hydrolyzate of beef heart tissue and bovine blood; enzymatic hydrolysates of whey cheese albumin; enzymatic hydrolysates or buttermilk casein acids and hydrolyzed or autolysed Eudrillus eugeniae with natural or artificial three-dimensional structures that unexpectedly shortened the period of the lag phase of microorganisms;
- contaminants can be removed from the sample, such as suspended solids in waters that interfere with microbial identification and quantification;
- an extremely versatile device is achieved which, in the form of a unit or several units combined, enables the detection, recovery, identification and / or counting of the most dissimilar microorganisms in different types of samples, from gaseous, liquid, solid , gels, zoles, with contamination levels from less than 1 CFU / sample unit to 10 9 CFU / sample unit, without interference from sample contaminants.
- the advantages of the method and the device consist of:
- the proposed method and devices achieve the detection of all microorganisms and / or their recovery, whether or not they adhere to the structure, unlike the solutions prior to the present invention, which do not guarantee that all microorganisms adhere to the Nanostructures nano (as an example E. coli 0157: H7), nor that all that adhere can be recovered in a reasonable time for future identification;
- the present method is not essentially based, nor only, on the adhesion of viable microorganisms to the structures of the device, all microorganisms present in the sample are detected, even at low concentrations or from their spores, hyphae or other propagules , and this is achieved unlike the previous methods, in which the adhesion of the microorganisms depends on their concentration in the sample (at lower concentration, lower adhesion);
- the method provided for in the present invention enables the detection, recovery, identification and / or enumeration, regardless of the original characteristics of the structures, their ions or their pH, unlike some of the patents already described, in which the Adhesion of microorganisms to the structures for concentration and subsequent identification is executed by the activity of the ions on the surfaces of the structures that interact with the microbial cells, so that if the sample carrying the microorganisms contains substances that interfere or trap these ions, or if their pH affects them, the correct detection, identification or timely quantification is not achieved;
- the proposed invention does not require secondary identification steps, or concentration of the sample, or special aseptic conditions, nor necessarily equipment, and thus differs from the previous descriptions, which most of them require the separation of microorganisms from the structures for subsequent identification, which includes additional steps such as centrifugation, requires additional equipment (centrifuges) and exposes the recovered microorganisms to the environmental contamination or using centrifuges under aseptic conditions;
- the new method is simple, low cost, identification is not delayed and does not require additional high-tech techniques, unlike other disclosed inventions that provide for one or more additional phases, require culture media independent of the structures to isolate microorganisms for subsequent identification by different methods, including immunoenzymes or other molecular techniques that delay identification, make it more expensive and technically complex;
- the method is very stable for its execution, allowing each step to be executed with prolonged intervals of time between them in the cases that are required, as already mentioned, the nutritional formulations, when absorbed in the three-dimensional structures with nano- and micro- cavities and after removing the solvent, forming the devices are very stable to changes in temperature and humidity and therefore can be used safely for long periods of time.
- This effect is due to the fact that the solids of the nutritional formulation have low humidity and the residual moisture is subjected to adsorption forces on the surfaces of the cavities that make up the device and therefore is not available for degradation reactions biochemical or biological, until the second solvent or sample is added;
- the present invention describes a method with a limit of detection per unit of sample of nutritive compositions that are used very low (less than 1 CFU), which means that they can detect and recover microbial species at very low concentrations and the identification and / or enumeration is facilitated and unlike the procedures disclosed in the state of the art, it does not need large volumes of sample, nor high concentrations of inoculum;
- microorganisms are detected in unison, such as yeasts, filamentous fungi, Gram positive and Gram negative bacteria, microbacteria and nanobacteria, an effect not previously achieved by other procedures;
- natural clays that originally have bactericidal, fungicidal or bacteriostatic activities can be used to execute the method and form the devices, without the additional costs of purification or chemical modification for the promotion of microbial growth, thanks to its combination with other components described in the previous paragraph;
- the method makes it possible to determine the sensitivity or resistance to antimicrobials in unison with their identification in a very short period of time and for any species, genus or group of microorganisms present in the sample, thanks to the combination of different three-dimensional structures, with different nutritional compositions, enzymatic markers and with the selected antimicrobials;
- the new device is simple, low cost, easily prepared for manufacturing.
- the nutritional components of the present invention are selected from mixtures of proteins, carbohydrates, vitamins and minerals degraded by chemical or enzymatic methods.
- One or more of these nutrient mixtures stimulating microbial growth prepared in aqueous solutions or in solutions with salts in concentrations of 0.1 to 3 g / l are inoculated with 0.1 ml of the microorganism (s) possible to detect, recover, identify or enumerate at a concentration of 3 x 10 8 CFU / ml and incubate at temperature and tension of desired oxygen, measuring the microbial growth kinetics by any of the known methods, preferably determining the increase in optical density over time. That or those compositions are selected that guarantee a reduction of the lag phase of growth that does not exceed 60-120 min for the bacteria and 16 h for the yeasts and filamentous fungi.
- Examples of the nutritional components are the enzymatic hydrolysates of algae Spirulina platensis described in the Certificate of Invention Author of Cuba 22310; Saccharomyces cerevisiae extract obtained by enzymatic hydrolysis as described in the Certificate of Invention Author of Cuba 22221 and enzymatic hydrolyzate of Torula forage yeast (Certificate of Invention Author of Cuba 22280); Ipomoea batatas extract, as disclosed in Cuba patent 23507; tomato extract (Certificate of Invention Author of Cuba 22308); Enzymatic hydrolysates of beef heart tissue (Certificate of Invention Author of Cuba 22442), of bovine blood (Certificate of Invention Author of Cuba 22208) and of beef liver (Certificate of Invention Author of Cuba 22220); Enzymatic hydrolysates of lactoalbumin obtained from cheese whey (Certificate of Invention Author of Cuba 22219), enzymatic hydrolysates or casein acids of
- enzymatic hydrolysates such as peptones and triptonas or commercial extracts of algae proteins, microorganisms, plant parts, higher animal tissues and their combinations, as an example obtained from meat from meat beef, brain, potato, among others, in amounts of 1 to 10 g / l.
- one or more chromogenic, fluorogenic or bioluminescent enzyme markers are added thereto in amounts of 0.01 to 2 g / l.
- these markers can be: phenol-derived compounds, such as ortho- and para-nitrophenols, para-nitro-aniline, indolyl derivatives: 5-bromo-4-chloro-3-indolyl, 5-bromo-6-chloro -3-indolyl (magenta), 6-chloro-3-indolyl (salmon), derivatives of methylcoumarin and methylumbelliferil (MUG) to detect activities galactosidase, glucuronidase, decarboxylase, glucosidase, phosphatase, among others.
- phenol-derived compounds such as ortho- and para-nitrophenols, para-nitro-aniline
- indolyl derivatives 5-bromo-4-chloro-3-indolyl, 5-bromo-6-chloro -3-indo
- Other substances such as promoters or inhibitors of microorganisms belonging to certain genera, species or groups, can be added to the mixture of nutritional compositions and enzymatic markers.
- these substances can be vitamins, mineral salts, albumin, antibiotics, dyes, dyes, bile salts, ox bile, sugars, amino acids.
- Other substances that increase the solubility of the enzyme markers or the permeability of the cells of the microorganisms in amounts of 0.01 to 40 g / l can also be added.
- the selected nutritional composition can also be added salts, resins, natural plant extracts, fatty acids, esters, bactericides, bacteriostats, alcohols, surface-active substances or mixtures thereof in amounts of 0.01 to 2 g / l and / or antibiotics or antifungals in amounts of 10 to 100 pg / l.
- the selected nutritional composition, together with the enzyme markers and other components, is dissolved or dispersed in a first solvent in amounts of 1 to 150 g / l.
- the solvent may be distilled or deionized water, aqueous salt solutions (NaCI, phosphate solutions, among others), alcohols and alcoholic solutions (eg 10% w / v basic fuchsin solution in ethyl alcohol), solutions of substances that increase the solubility of enzyme markers [example dimethylsulfoxide (DMSO)] or the permeability of the cells of microorganisms.
- aqueous salt solutions NaCI, phosphate solutions, among others
- alcohols and alcoholic solutions eg 10% w / v basic fuchsin solution in ethyl alcohol
- solutions of substances that increase the solubility of enzyme markers example dimethylsulfoxide (DMSO)] or the permeability of the cells of microorganisms.
- the nutrient mixture is formed and together with the enzymatic markers and other components dissolved or suspended in the first solvent, they can be sterilized by any of the known methods, except for those compositions containing thermolabile substances, which should not be heat sterilized.
- the nutrient mixture is formed and together with the enzymatic markers and dissolved or suspended in the first solvent and other components, they are brought into contact with one or more three-dimensional structures of natural or artificial clays or ceramics or of other ceramics. These three-dimensional structures can be previously sterilized by any of the known methods.
- the contact time of the nutritional composition and other components dissolved or suspended in the first solvent and the three-dimensional clay or ceramic structure varies, generally, from 10 min for smaller sizes of nanometh or submicron size ( ⁇ 1000 nm) to 60 min for larger structures.
- These structures have a specific surface area of 2 x 10 3 to 6 x 0 8 m 2 / m 3 and are made up of a plurality of nano-, micro- and macrocavities or their combinations.
- clays and / or natural or artificial ceramics are selected from kaolinite, halloisite, dickite, nacrite, chrysolite, antigorite, lizardite, vermiculite, mica, hectorite, saponite, hydrotalcite, muscovite, chlorite, diatomaceous earth, bentonites (montmorillonite, sauconite, beidellinite, nontrolite) clinoptilotites, hydroxyapatites, zeolites and calcium phosphates or combinations thereof.
- the calcium phosphate structures mentioned in the previous paragraph are selected from: metaphosphate [Ca (P0 3 ) 2 ], mono-hydrated monocalcium phosphate [Ca (H 2 P0 4 ) 2 H 2 0], di-hydrogen tetracalcium phosphate ( Ca 4 H 2 P 6 0 2 o), heptacalcium phosphate [Ca 7 (P 5 0i 6 ) 2 ], calcium pyrophosphate (Ca 2 P 2 0 7 and Ca 2 P 2 0 7 2H 2 0), dicalcium phosphate [ CaHP0 4 , CaHP0 4 2H 2 0 and Ca (H 2 P0) 2 ], tricalcium [Ca 3 (P0) 2 ], octacalcium phosphate [Ca 8 H 2 (P0 4 ) 6 5H 2 0], calcium deficient hydroxyapatite [ Ca 10 - x (HP0 4 ) x (P0 4 ) 6-x (OH) 2 -x], hydroxy
- Natural or artificial clays and / or ceramics and calcium phosphates may have isomorphic substitutions of ions for cations or previously functionalized with different ions, preferably monovalent, divalent, trivalent or tetravalent, which act as enzymatic catalysts, such as Na, K , Ca, Mg, P, Fe, Zn, forming surface layers or distributed throughout its structure.
- the three-dimensional structures mentioned are selected from those whose cavity dimensions respond to:
- nano-cavities or particles preferably of rough surfaces, with diameters or clearances of up to 200 nm for nano- and micro-bacteria; - nano- and submicrocavities with diameters or clearances from 5 nm to 1000 nm for bacteria of different sizes;
- micro- and macro-cavities with diameters or clearances of more than 1 pm and up to 2 mm for bacteria, yeasts and filamentous fungi;
- the cavities in the structure can be presented in the form of pores, channels, tubes, regular or irregular bags, of different geometric shapes or combinations thereof; or are arranged in the form of layers or sheets.
- the three-dimensional structures can form a film or layer 5 nm to 1 mm thick especially when used for the detection, identification or enumeration of microorganisms by the membrane filtration technique or for the detection of microorganisms on surfaces; or a column up to 10 cm high, especially when it is required to filter large volumes of liquid or suspension of microorganisms that can be found at low concentrations, or when several areas of the structure with different enzymatic markers or with different nutritive mixtures are used .
- the structures can also be used in the form of beads or beads with a diameter of 5 nm to 10 mm; hexagons or cubes in particular, forming part of a set of tests with different compositions, or they can be added to the liquid sample or suspension that contains the microorganisms.
- the height of the structures varies according to the presentation format to be used in the method and ranges from 5 nm for nanoaliquots, or microaliquots, or for joining several structures in a set of sandwich layers, up to 10 cm high.
- Three-dimensional structures can be presented in forms of fibers or networks that retain microorganisms and allow their detection. When it is desired that the structures detect and identify the microorganisms in the entire volume of a sample, those clays of great swelling capacity are used, until, naturally or by the addition of gelling agents, they take the form of the container containing it. .
- the three-dimensional structures of the present invention may have different zones with different porosities and different diameters or gaps of the nano-, micro- and macro-cavities through their volume, or their length, or their diameter, distributing said zones in gradient shape or in differentiated areas.
- compositions and enzymatic markers can be added in each zone, both through their structure, length or diameter, being distributed in this case in concentric areas.
- the distribution of the compositions, or the concentration of one, or several of its components can be guaranteed in the form of a continuous or discontinuous gradient.
- alginates such as sodium
- natural polysaccharides such as pectin and chitin derivatives
- gum arabic and other gums such as corn and sweet potato, or pre-gelatinized starches
- dextran and carboxymethyl cellulose and other polymers derived therefrom carrageenan or sodium carrageenan
- carrageenan or sodium carrageenan the agar
- agarose and derived artificial polymers derivatives of vinyl alcohol, polybutylene, polyethylene and polypropylene
- polyvinylpyrrolidone of different molecular weights in amounts of 0.01 to 0.5 g / g of three-dimensional structure.
- substances that increase its absorption capacity such as activated carbon and cellulose in amounts of 2 to 4 mg / can be added g, for example in the form of sheets.
- the first solvent is removed.
- the most recommended procedure is at room temperature and atmospheric pressure with forced air circulation to preserve nutrients and prevent their degradation, as in the case of thermolabile vitamins.
- the removal of the first solvent can also be carried out by subjecting the three-dimensional structure to drying at a temperature of 25 to 1 10 ° C at atmospheric pressure or at a pressure lower than atmospheric, for example in a vacuum oven, for a period of 30 min to 3 hours. eliminating it by sublimation, or by spray drying at a temperature of 90 to 180 ° C.
- the structure After the removal of the first solvent, the structure can be preserved until testing for periods of up to 5 years. It is recommended to sterilize the structures with the embedded compositions, preferably, but not exclusively by irradiation of different nature. Other methods can be used, such as autoclaving, for those structures that do not contain thermolabile components.
- the ability to recover the target microorganisms is checked by selecting those structures that have a detection limit of less than 1 CFU / 10 I for liquid samples, less than 1 CFU / 250 g for solid samples or less than 1 CFU / 10 m 3 air and a maximum limit of up to 10 9 CFU / ml or 10 9 CFU / g or 10 3 CFU / m 3 .
- the three-dimensional structure can be placed on supports in the form of sheets, layers or cylinders permeable to gases or liquids or impervious to them; or surrounded by waterproof materials on at least 90% of its surface.
- microbial cells that may be made up of a plurality of the microorganisms to be detected, recovered, identified and / or enumerated belonging to a species, a genus, a group or combinations thereof are contacted, and includes nanobacteria , bacteria, molds and yeasts and spores, hyphae or other propagules, with three-dimensional structures in the presence of a second solvent.
- This second solvent can be water, a hypotonic, sotonic or hypertonic solution of salts, such as sodium chloride, or the sample itself depending on the nature of the microorganisms to be identified.
- Examples may be biological samples such as blood or food, such as milk, or sample suspensions.
- Another variant of the method consists in contacting a suspension of microorganisms in gaseous carriers, such as air or aerosols.
- the sample is applied to the structure in the following proportions: 0.05 to 3 ml / g, or 0.1 to 10 m 3 / g of three-dimensional structure.
- the second solvent or the samples containing them can be contacted with the surface of the three-dimensional structure or passing through it, or to a certain depth; the cells or samples containing it being in the form of a suspension in the gas phase or in the liquid phase, or in the form of a gel or with a semi-solid or solid consistency, applying it directly on the structure, or by means of an application device such as, for example , a swab, handle, needle, among others.
- the samples or the second solvent that contains the microorganisms can be applied to several structures at the same time.
- the three-dimensional structure is then maintained at temperatures of 20 to 50 ° C for a period coinciding with the longer duration of the lag phase or the end of the growth acceleration phase of the slower developing microorganism, with oxygen tension that can vary, from aerobic conditions, to the total absence of this element depending on the target microorganisms to be detected.
- nanoparticles or cavities growth is appreciated by the activity of nanobacteria, and other bacteria indirectly by the products of the cleavage of enzymatic markers that can accumulate under the action of microbial enzymes.
- microcavities smaller bacteria develop, in macrocavities larger bacteria, yeasts and filamentous fungi, and all microorganisms on the surface.
- the detection and identification of the plurality of cells is executed primarily, but not exclusively by the visual or automatic detection of fluorescence or bioluminescence.
- other methods can be used, such as: by changing the color of the three-dimensional structure or its consistency, texture, brilliance, opacity, hue, homogeneity, or transparency; or by changes in color, brilliance, hue, transparency, or fluorescence of the second solvent or sample; or by the appearance of bioluminescence, both inside the cavities, and on the surface of the structure; or by the observation of other morphological structures; or metabolic reactions in the three-dimensional structure, in the second solvent or in the sample; or by a combination of several, or all forms of identification.
- the determination of the concentration of cells in the sample is carried out on the surface of sheets or layers of the structure, or it can be executed by visual enumeration, or by automatic methods on the surface, or by measuring the intensity of the signal Fluorogenic, colorimetric or bioluminescent, under light in the range of the ultraviolet, visible or infrared spectrum, of electrical, thermal, magnetic signals, by changing the pH, or by quantifying the emission or consumption of gases derived from the activity of the microorganisms during the lag phase or the growth acceleration period, such as carbon dioxide, oxygen, hydrogen sulfide, ammonium, hydrogen.
- the method can be executed with the help of devices formed by a nutritious mixture stimulating microbial growth, selected from the enzymatic hydrolysates of algae Spirulina platensis; enzymatic hydrolyzate of Saccharomyces cerevis ⁇ ae and Torula; Ipomoea batatas extract; tomato extract; enzymatic hydrolyzate of heart and liver liver tissue and bovine blood; enzymatic hydrolysates of lactoalbumin obtained from cheese whey, enzymatic hydrolysates or casein acids from butter whey and hydrolyzed or autolysed from Eudrillus eugeniae and their combinations and one or more chromogenic, fluorogenic or bioluminescent enzyme markers absorbed and / or adsorbed in a three-dimensional structure of clays or natural or artificial ceramics, selected from kaolinite, halloisite, dickite, nacrite, chrysolite, antigorite, lizardite, vermiculite, mica,
- the devices of the present invention contain all the components necessary for the execution of the method and said components are in dehydrated form in amounts that guarantee the concentrations of each of them as described in the original method.
- These devices may consist of calcium phosphates selected from metaphosphate [Ca (P03) 2], monohydric monocalcium phosphate [Ca (H 2 P0 4 ) 2 H 2 0], di-hydrogen tetracalcium phosphate (Ca 4 H 2 P60 2 o), heptacalcium phosphate [Ca 7 (P 5 0 16 ) 2 ], calcium pyrophosphate (Ca 2 P 2 07 and Ca 2 P 2 0 7 2H 2 0), dicalcium phosphate [CaHP0 4 , CaHP0 4 -2H 2 0 and Ca (H 2 P0 4 ) 2 ], tricalcium [Ca 3 (P0 4 ) 2 ], octacalcium phosphate [Ca 8 H 2 (P0 4 ) 6 5H 2 0], calcium deficient hydroxyapatite [Ca 10 -x (HPO 4 ) x (PO 4 ) 6 -x (OH) 2 -x], hydroxyapatit
- Some devices may consist of natural or artificial clays, ceramics and other calcium phosphates with isomorphic ion substitutions or be functionalized by ions or monovalent, divalent, trivalent or tetravalent cations, forming surface layers or distributed throughout their structure. These cations can be Na, K, Ca, Mg, P, Fe, Zn and essentially play a role as catalysts for the enzymatic reaction of marker degradation.
- the three-dimensional structures of these devices have cavities in the form of pores, channels, tubes, regular or irregular bags, of different geometric shapes or combinations thereof; or they are arranged in the form of layers or sheets, depending on the type of clay or ceramic used and their obtaining technology, these cavities are classified to direct their use in the method as: - nano-cavities or particles, preferably of rough surfaces, with diameters or clearances of up to 200 nm for nano- and micro-bacteria;
- micro- and macro-cavities with diameters or clearances of more than 1 pm and up to 2 mm for bacteria, yeasts and filamentous fungi;
- These devices contain one or several nutritional compositions, whose components are selected from mixtures of proteins, carbohydrates, vitamins and minerals degraded by chemical or enzymatic methods that ensure that the lag phase period does not exceed 60-120 min for bacteria and 16 h for yeasts and filamentous fungi in amounts of 0.33 to 20 mg / g of three-dimensional structure.
- the devices also contain one or more chromogenic, fluorogenic or bioluminescent enzyme markers within the cavities or on the surface of the structures in amounts of 0.0033 to 0.66 mg / g of three-dimensional structure.
- the devices may contain pH and redox potential indicators.
- enzymatic hydrolysates chemical hydrolysates or algae protein extracts, microorganisms, plant parts, higher animal tissues and their combinations in amounts of 0.33 to 4
- enzymatic hydrolysates chemical hydrolysates or algae protein extracts, microorganisms, plant parts, higher animal tissues and their combinations in amounts of 0.33 to 4
- bacteriological peptone, tryptone, meat extract, brain extract, heart extract, potato extract, corn extract, rice extract, soy peptone, yeast extract can be mentioned.
- the devices may contain other substances such as growth promoters, inhibitors, salts, buffers, carbohydrates and other components to promote the growth of microorganisms belonging to certain genera, species or groups in amounts of 0.003 to 14 mg / g.
- growth promoters such as growth promoters, inhibitors, salts, buffers, carbohydrates and other components to promote the growth of microorganisms belonging to certain genera, species or groups in amounts of 0.003 to 14 mg / g.
- the components that are inside the cavities or on the surface of the devices are found in amounts of 0.33 to 60 mg / g of the three-dimensional structure.
- the devices of the present invention have detection limits of less than 1 CFU / 10 I for liquid samples, less than 1 CFU / 250 g for solid samples or less than 1 CFU / 10 m 3 and a maximum limit of up to 10 9 CFU / ml or 10 9 CFU / g or 10 3 CFU / m 3 .
- Those devices that are used to selectively detect, recover, identify or enumerate certain microorganisms within a sample contain selective agents of microbial growth, selected from the salts (eg bile salts, sodium deoxycholate), others such as resins, natural plant extracts , fatty acids, esters, bactericides, bacteriostatics, alcohols, substances with surface activity or mixtures thereof in amounts of 0.0033 to 0.8 mg / g of the three-dimensional structures of clays or ceramics and antibiotics (eg vancomycin, nalidixic acid ), antifungals (eg nystatin, ketoconazole, amphotericin B), in amounts of 0.033 to 0.33 pg / g.
- antibiotics eg vancomycin, nalidixic acid
- antifungals eg nystatin, ketoconazole, amphotericin B
- Those devices that are used by passing aqueous samples through their three-dimensional structure, and that have very water-soluble components, may contain substances that help fix the nutritive composition and enzymatic markers to the three-dimensional structures, including alginates (for example sodium or calcium), natural polysaccharides; pectin, chitin, gum arabic and other gums, starches such as pregelatinized corn, dextran and carboxymethyl cellulose and other polymers derived therefrom; carrageenan, agar, agarose and artificial polymers derived from vinyl alcohol, polybutylene, polyethylene and polypropylene, polyvinyl pyrrolidone in amounts of 0.01 to 0.5 g / g three-dimensional structure.
- alginates for example sodium or calcium
- natural polysaccharides for example sodium or calcium
- pectin, chitin, gum arabic and other gums starches such as pregelatinized corn, dextran and carboxymethyl cellulose and other polymers derived therefrom
- Other compounds may be part of the devices, such as substances that increase their absorption capacity, such as activated carbon and cellulose in the amount of 2 to 4 mg / g that is used to form devices whose structures have specific surfaces. of less than 3 x 10 m 2 / m 3 .
- a device can be formed by a three-dimensional structure or by a set of structures.
- Each three-dimensional structure can form a film or layer 5 nm to 1 mm thick; or a column up to 10 cm high; or particles of different geometric shapes, such as spheres, pearls, hexagons, cubes, with a diameter of 5 nm to 10 mm; or cylinders or tubes 5 nm to 10 cm in diameter and 5 nm to 10 cm in height; or fibers, nets, or take the shape of the container that contains it.
- the structure of the device may increase in size and volume due to the "swelling" by absorbing the sample containing the microorganisms, or the second solvent containing the microorganisms and occupying the entire volume of the container containing them.
- They can be devices made from hydroxyapatite, agar and pre-gelatinized corn starch.
- a device may have a three-dimensional structure that has different zones with different porosities and different diameters or gaps of the nano-, micro- and macro-cavities through its volume, or its length, or its diameter, said zones being distributed in gradient shape or in differentiated areas.
- Each device in its unique three-dimensional structure contains one or several different nutritive compositions and enzymatic markers through its volume, length or diameter, distributing said compositions in the form of a gradient or in differentiated areas.
- the devices can maintain the three-dimensional structure on supports in the form of sheets, layers or cylinders permeable to gases or liquids or impervious to them; or surrounded by waterproof materials on at least 90% of its surface.
- a mixture of them was also formed in the following amounts: papainic hydrolyzate of heart muscle in the amount of 1 g / l deionized water, Saccharomyces cerevisiae yeast extract in the amount of 1 g / l, Enzymatic casein hydrolyzate in the amount of 2 g / l and 1 g / l of pancreatic heart hydrolyzate.
- the products to be tested were inoculated with 0.1 ml of a suspension of the target microorganisms at a concentration of 3 x 10 8 CFU / ml.
- the bases were incubated separately and the mixture for 8 h at 37 ° C in an aerobic atmosphere and the increase in optical density was monitored in a 680 nm spectrophotometer.
- the nutritive mixture showed a reduction of the lag phase of E. coli growth in 30 min, while the individual bases showed a duration of that variable phase, including: papainic hydrolyzate of heart muscle - 45 min , Saccharomyces cerevisiae yeast extract - 80 min, enzymatic casein hydrolyzate 60 min and pancreatic heart hydrolyzate - 50 min.
- the mixture of nutritional components was selected, which will be identified hereinafter as CCL, and dissolved in 1 I of deionized water as the first solvent in the amount of 5 g / l (variant 1) and in the amount of 10 g / l (variant 2)
- pancreatic hydrolyzate of heart muscle was incorporated in the amount of 1 g / l (variant 1) and 2 g / l (variant 2), resulting in nutrient concentrations, as expressed in 5 g / l and 10 g / l, respectively.
- composition was prepared, two enzymatic markers, one chromogenic [2-nitrophenyl-pD-galactopyranoside (Ci 2 H 15 N0 6 )], were added in amounts of 0.5 g / l (variant 1) and 1 g / l (vanant 2) and other fluorogenic [4-methylumbelliferyl- -D-glucuronide (Ci 6 H 16 0 9 -2H 2 0)] in amounts of 0.075 g / l (variant 1) and 0.15 g / l (variant 2).
- the nutritional compositions and enzymatic markers were added other substances, such as growth promoters, specifically lactose (5 and 10 g / l), sorbitol (0.5 and 1 g / l), L-tryptophan (1 and 2 g / l); inorganic salts, specifically monobasic potassium phosphate (2.75 and 5.5 g / l), dibasic potassium phosphate (2.75 and 5.5 g / l) and sodium chloride (5 and 10 g / l); Finally, bile salts were incorporated in a concentration of 1.3 to 2.6 g / l.
- growth promoters specifically lactose (5 and 10 g / l), sorbitol (0.5 and 1 g / l), L-tryptophan (1 and 2 g / l); inorganic salts, specifically monobasic potassium phosphate (2.75 and 5.5 g / l), dibasic potassium phosphate (2.75 and 5.5 g /
- the selected nutritional composition, together with the enzymatic markers and other components were dissolved in the first solvent in amounts of 23.9 g / l for variant 1 and 47.8 g / l for vanant 2. Once the nutrient mixture was formed and together with the enzyme markers and other components dissolved in the first solvent, they were sterilized by filtration.
- the nutritive mixtures together with the enzyme markers and other components dissolved in the first solvent were contacted with two three-dimensional ceramic structures specifically the previously sterilized hydroxyapatite at 180 ° C for 60 min.
- the contact time of the compositions of variant 1 (V1) and variant 2 (V2) was 60 min.
- the three-dimensional structures mentioned had dimensions of the cavities corresponding to combinations of all the diameters or clearances of the cavities corresponding to nano-microcavities with diameters or clearances of 5 nm to 600 pm in the form of pores. These structures had a cylinder shape of 0.5 cm in diameter and 0.5 cm in height.
- the first solvent was removed by subjecting the three-dimensional structures to drying at a temperature of 60 ° C in a vacuum oven, for a period of 3 h.
- a suspension of E. coli in isotonic saline solution was contacted in a concentration of 3 x 10 6 CFU / ml with 0.1 g of the three-dimensional structures in amounts of 0.2 ml (2 ml / g ratio).
- the three-dimensional structures were then maintained at temperatures of 35 ⁇ 2 ° C, under aerobic conditions for a period of 2 h coinciding with the duration of the lag phase of E. coli growth.
- V3 - Hydroxyapatite beads with a total weight of 0.2 g, with a specific surface area of 2 x 10 3 m 2 / m 3 , impregnated with the nutritional composition according to V2 of example 1.
- V4 - Hydroxyapatite beads with a total weight of 0.2 g, with a specific surface area of 3000 m 2 / m 3 , impregnated with the nutritional composition according to V2 of example 1.
- the structures were absorbed for 2 h with the nutritional compositions and dried under vacuum for 2 h at 60 ° C.
- V7 Cellulose discs without clays with 6 mm diameter, 0.94 cm 2 of surface and 0.014 g, impregnated with the nutritional composition according to V1 of example 1.
- the ceramics were embedded in the nutritional composition for 3 h and the first solvent was removed at a temperature of 70 ° C.
- the papainic hydrolyzate of heart muscle was taken for the bacterial growth promotion test, according to Cuban Invention Author Certificate No. 22442 in an amount of 0.2 g / l deionized water.
- the base was incubated for 8 h at 37 ° C in an aerobic atmosphere and the increase in optical density was monitored in a 680 nm spectrophotometer.
- the nutritional base showed a reduction of the lag phase of Enterococcus growth in 120 min.
- this hydrolyzate was selected and dissolved in 1 I of deionized water as the first solvent in the amount of (10 g / l equivalent to 10 mg / g of structure) and it was added salts to regulate the possible change of pH caused by the three-dimensional structure in specific dipotassium phosphate (3.5 g / l, equivalent to 8.75 mg / g structure), monopotassium phosphate (1.5 g / l, equivalent to 3.75 mg / g structure) and sodium chloride (5 g / l, equivalent to 12.5 mg / g structure), which makes a total nutrient mixture of 50 mg / g). To the structure was added as fluorogenic marker methylumbelliferyl ⁇ -glucoside in the amount of 0.075 g / l, equivalent to 0.1875 mg / g of three-dimensional clay structure.
- the components were previously sterilized in autoclave at 121 ° C for 15 min.
- the presence of Enterococcus was observed by blue fluorescence at 120 min.
- the papain hydrolyzate of heart muscle was taken for the bacterial growth promotion test (Enterococcus faecalis ATCC 29212, Enterococcus avium ATCC 19434, Enterococcus avium ATCC 14025), according to Cuban Invention Author Certificate No. 22442 in quantity of 0.2 g / l desion / zada water.
- the bases were incubated for 8 h at 37 ° C in an aerobic atmosphere and the increase in optical density was monitored in a spectrophotometer at 680 nm.
- the nutritional bases showed a reduction of the lag phase of growth of 2 h.
- concentrations of each component to be embedded in the structures were doubled.
- a color change was observed in the second solvent, slightly blue, with respect to the original that was greenish for both devices with three-dimensional clay structures for E. avium.
- variant 1 1 (V 1 1) with the specific surface area of 2 x 10 3 m 2 / m 3
- variant 12 (V12) with the specific surface area of 3.3 x 10 3 m 2 / m 3
- variant 13 with the specific surface area of 1.5 x 10 3 m 2 / m 3 .
- the contact time of the compositions of the variants was 180 min.
- the first solvent was removed by subjecting the three-dimensional structures to drying at a temperature of 60 ° C in a vacuum oven, for a period of 60 min.
- a suspension of E. coli in isotonic saline solution was contacted in a concentration of 1 colony in 5 ml and from it 0.1 ml was taken and applied on the surface of the device.
- V14 - Compacted caolinite in conglomerates with a total weight of 0.2 g, impregnated with the nutritional composition according to V2 of example 1.
- the spaces between the kaolinite particles form cavities of different shapes, corresponding in size to microcavities.
- the structures are absorbed for 4 h with the nutritional compositions and dried under vacuum for 3 h at 60 ° C.
- a suspension of E. coli in isotonic sodium phosphate solution is contacted in a concentration of 10 6 CFU / ml with 0.1 g of the three-dimensional structures in amounts of 0.2 ml (2 ml / g ratio).
- E. coli strain ATCC 25922 is tested as described in example 1, and is formed according to the V2 of that example, and a nutritional composition is made as described in that variant 2 of example 1, except that it is only add the 4-methylumbelliferyl-pD-glucuronide (MUG) fluorogenic substrate in an amount of 0.2 g / l.
- MUG 4-methylumbelliferyl-pD-glucuronide
- the nutrient mixture together with the enzyme marker and other components dissolved in the first solvent are brought into contact with three three-dimensional structures.
- the first structure of an artificial ceramic nature is composed of a nano-layer of hydroxyapatite with nanoporosity, a specific surface area of 50 x 10 6 m 2 / m 3 and with nanocavities, 20 nm in height that, rests on a lower layer of Agaropectin in the amount of 0.5 g / g.
- the structure rests on the entire surface of an impermeable disk of cellulose derivatives, specifically 6 cm diameter cellulose nitrate to form a first device (variant 16).
- the second structure but of siliceous earth with a specific surface area of 3 x 10 5 m 2 / m 3 at 1 x 10 6 m 2 / m 3 and porosity in the range of nano- and microcavities is mixed with the ingredients of the nutritional composition and with the addition of agar (0.3 g / g) dissolved in the first solvent.
- the second device It is prepared by placing the siliceous earth structure described in a cylinder 3 mm high by 90 mm in diameter (variant 17).
- the third three-dimensional structure composed of hydroxyapatite with a specific surface area of at least 1.25 x 10 3 m 2 / m 3 with irregular macro- and microcavities, followed by a three-dimensional zeolite structure with a specific surface area greater than 5 x 0 3 m 2 / m 3 .
- the nutritive compositions of example 1, variant 2 and the fluorogenic substrate described in that variant are absorbed in the first and second structures.
- the height of the set of three-dimensional structures reaches 10 cm and the diameter of 4 cm.
- a suspension of E. coli in isotonic saline solution is contacted in a concentration of 10 2 CFU / ml with the entire surface of the first device (V16) with the help of a sodium alginate swab.
- the three-dimensional structure is then maintained at temperatures of 35 ⁇ 2 ° C, under aerobic conditions for a period of 120 min and the growth is detected by the emission of fluorescence under light at 366 nm with the help of a sensor and is identified by the glucuronidase activity
- the E. coli suspension in isotonic saline solution is contacted at a concentration of 10 CFU / ml with the entire surface of the second device (V17) with the help of an automatic pipette and distributed with a Drigalski spatula.
- the three-dimensional structure is then maintained at temperatures of 35 ⁇ 2 ° C, under aerobic conditions for a period of 240 min and the growth is detected by the emission of fluorescence under light at 366 nm with the help of a sensor and is identified by the glucuronidase activity
- the supports selected were HAP-S ceramics (specific surface area of 7.5 x 10 3 m 2 / m 3 ) and HAP-56 (specific surface area of 3 x 10 5 m 2 / m 3 ), in addition to calcined siliceous earth and purified (TSC) (specific surface area of 5.3 x 10 4 m 2 / m 3 ).
- a nutrient mixture was prepared, with fluorogenic and chromogenic markers and other components according to V1 of Example 1.
- Another mixture of a fluorogenic compound was prepared in parallel with salts and other components according to the following composition: ammonium sulfate [(NH 4 ) 2 S0 4 ] 5.0 g / l of the first solvent; potassium hydrogen phosphate [K 2 HP0 4 ] 0.45 g / l; potassium di-hydrogen phosphate [KH 2 P0] 0.31 g / l; sodium hydrogen phosphate [Na 2 HP0] 0.92 g / l; sodium chloride [NaCI] 0.1 g / l; calcium chloride [CaCI 2 ] 0.05 g / l; magnesium sulfate heptahydrate [MgS0 4 .7H 2 0] 0.2 g / l; L-histidine monohydrochloride 0.005 g / l; L-tryptophan 0.02
- compositions were adjusted to 6.8 pH and sterilized by filtration through Nalgene disposable filtration units (0.2 ⁇ , pore size) (Nalge Co., Rochester, N.Y.).
- microbial suspensions of approximately 10 8 CFU / ml were prepared in 9 ml of a 0.85% sterile saline solution (w / w), from pure cultures of Escherichia coli ATCC 25922 incubated up to 24 h.
- the inoculum volume was 0.2 ml for each test variant, guaranteeing an inoculum concentration of 2 x 10 7 .
- the inoculated devices were incubated at 35 ⁇ 2 ° C under aerobic conditions.
- the reading was done visually using a 366 nm UV lamp every 30 min.
- This indicator demonstrates that the microbial species possesses an enzymatic activity in correspondence with the enzymatic marker used in the compositions.
- each nutritional composition combined with a three-dimensional clay structure responds in a shorter or longer period to the detection or identification of microorganisms.
- the selection of the nutritional components was also carried out according to the methodology of example 1, but with a strain of Pseudomonas aeruginosa (ATCC 27853).
- Individual and mixed enzyme hydrolysates were evaluated, including papainic hydrolyzate of beef heart tissue, according to Certificate of Invention Author of Cuba 22442, and pancreatic hydrolyzate of heart muscle and mixtures thereof.
- the results showed that for the 3 cases the lag phase had a maximum duration of 120 min, so both were selected to form the nutritional composition.
- the first mixture (M1) contained: Saccharomyces cerevisiae extract - 3.24 g / l; enzymatic hydrolyzate of bovine blood - 6.37 g / l; enzymatic casein hydrolyzate - 9.97 g / l; commercial soy peptone - 3.24 g / l and commercial meat extract - 2.43 g / l.
- the second mixture (M2) contained: Saccharomyces cerevisiae extract - 5.0 g / l; enzymatic hydrolyzate of bovine blood - 5.0 g / l; enzymatic casein hydrolyzate - 5.0 g / l; commercial soy peptone - 6.0 g / l and commercial meat extract - 3.0 g / l.
- the third mixture (M3) contained: Saccharomyces cerevisiae extract - 6.0 g / l; enzymatic bovine blood hydrolyzate - 6.0 g / l; enzymatic hydrolyzate of casein - 3.0 g / l; commercial soy peptone - 6.0 g / l and commercial meat extract - 4.0 g / l.
- the products to be tested were inoculated with 0.1 ml of a suspension of the target microorganisms at a concentration of 3 x 10 8 CFU / ml.
- the bases were incubated separately and the mixture for 8 h at 37 ° C in an aerobic atmosphere and the increase in optical density was monitored in a 680 nm spectrophotometer.
- STR-STAP - nutritional composition
- STR-STAP enzymatic casein hydrolyzate according to the Certificate of Invention Author of Cuba 22166 (3.0 g / l), Saccharomyces cerevisiae yeast extract according to
- thallium acetate 0.014 g / l
- nalidixic acid sodium salt 0.008 g / l
- DL-phenylalanine 1.0 g / l
- ammonium ferric citrate 0.5 g / l
- sodium chloride 0.2 g /
- dextrose 0.1 g / l
- 0.2 g / l MU-fos was added as a fluorogenic marker
- compositions were dissolved in proportion with a first solvent (deionized water) and their pH adjusted to 7.3. They were sterilized by filtration through 0.2 pm disposable filtration units.
- a first solvent deionized water
- the target species Staphylococcus aureus ATCC 25923 and Streptococcus pyogenes ATCC 19615 were selected.
- the preparation of the dilutions, their inoculation and incubation was carried out as in example 10.
- Variant 25 allowed the detection of microorganisms of very high nutritional requirement, such as S. aureus in only 5 h and for S. pyogenes it was achieved in 24 h.
- the inoculum used was 0.2 ml of the sample for each variant.
- sample was evaluated by the traditional procedure using the CromoCen CC agarized media and bromothymol lactose blue agar (ABL).
- the CCL combination with HAP-56 was the variant that responded most quickly 2 h with 30 min, followed by the combination with the HAP-S structure that was in 3 h.
- This result indicates that E. coli is the germ that causes the infection, taking into account the selectivity of the nutritional composition and the device and that in the majority of cases registered in this type of samples it responds to this species.
- a pure culture of E. coli was used, from which a suspension of the order of 10 8 CFU / ml was prepared.
- a volume of 0.2 and 0.4 ml was taken, achieving inoculums to be applied in structures of the order of up to 0 7 and inoculated in parallel in both devices: CCL with HAP-S (V35) and MUG with HAP-S (V36).
- the variants were incubated at 35 ° C and the fluorescence response was observed every 30 min using 366 nm UV.
- the following table shows the results of the positive fluorescence response time (h: min), as an indicator of the microbial enzymatic activity on the marker used.
- the results show that there is no significant influence of the pH of the composition on the detection of the enzymatic activity of the microorganism (E. coli) with the selected enzyme marker (MUG).
- the positive response was detected in the period between 1 h and 30 min at 2 h of culture.
- the reduction of the duration of the lag phase was studied with the vegetable extract of Ipomoea sweet potatoes previously developed by the authors of the present invention, the enzymatic hydrolyzate of casein, soy peptone, a mixture of peptones and enzymatic yeast hydrolyzate, all in amounts of 0.2 g / l.
- the optical density was monitored every 1 h in a 380 nm spectrophotometer. As a result, it was observed that for C. albicans, the extract of Ipomoea batatas shortened the lag phase by at least 1 h with respect to the other components, soaking only at 16 h.
- the first experimental variants were prepared using the MU-fos fluorogenic substrate as the first enzyme marker.
- the substrate was added in an amount of 0.2 g to the CND composition consisting of: Ipomoea batatas extract 20.0 g; yeast extract Saccharomyces cerevisiae 10.0 g; 1.0 g monopotassium phosphate; magnesium sulfate 0.5 g; 0.5 g sodium deoxycholate and 0.03 g nalidixic acid, for one liter of deionized water.
- the other composition used was the MCS medium, to which MU-fos was added in the same amount (0.2 g / l).
- the nutritional compositions prepared with the enzyme markers and other ingredients prepared for each experimental variant were dissolved in proportion with a liter of deionized water as the first solvent and the pH was adjusted to 6.6. They were sterilized by filtration through 0.2 pm disposable filtration units.
- the microbiological evaluation was performed with the reference strains: Candida albicans ATCC 10231, Candida parapsilosis ATCC 22019 and Candida giabrata ATCC 15126, freshly grown on Sabouraud dextrose agar for 36 h. From these cultures, suspensions were prepared in 9 ml tubes of a 0.85% sterile saline solution (w / w), until reaching a microbial density of the order of 10 8 CFU / ml.
- a volume of 0.2 ml was inoculated to each variant of the devices according to the method and incubated at 35 ° C. Using the 366 nm UV lamp, the fluorescent response was read every 30 min.
- the TSC clay somehow blocks the response of either the enzymatic activity of the test microorganisms or that of the specific fluorogenic substrate, since the biological functionality of the nano- is not appreciated during the entire culture period. compound.
- the response obtained by using this enzymatic marker (MU-fos) as part of the nutritional compositions is closely linked to the structure used as a nanostructured support, with Z being the most convenient among all variants.
- V52 - zeolite cubes with a total weight of 0.2 g, with a specific surface area of 7.0 x 10 3 m 2 / m 3 , impregnated with the nutritional composition according to V44 of example 15.
- the structures were absorbed for 1 h with the nutritional compositions and dried under vacuum for 3 h at 60 ° C.
- the fluorescence of E. coli is observed at 180 min at V50 and 210 min at V51 and that of C. albicans at V52 at 18 h.
- the bases are incubated separately and the mixture for 8 h at 37 ° C in an aerobic atmosphere and the increase in optical density is monitored in a spectrophotometer at 680 nm.
- the nutritive mixture shows a reduction of the lag phase of growth of all microorganisms of 90 min, with the exception of Aspergillus while the individual bases show a duration of that variable phase, and in some cases greater than 2 h, so the mixture is selected for the experiments.
- This mixture is dissolved in a saline solution (NaCI at 9.5 g / l) in an amount of 10 g / l.
- the nutritional composition is prepared, several enzymatic markers are added to it, one chromogenic [2-nitrophenyl- -D-galactopyranoside (C12H-15NO6)], in amounts of 1 g / l and three fluorogenic (4-methambelliferyl ⁇ -D- glucuronide, 4-methylmbelliferyl-pD-galactoside and 4-methylumbelliferyl-pD-glucoside) in amounts of 0.2 g / l each.
- C12H-15NO6 2-nitrophenyl- -D-galactopyranoside
- fluorogenic 4-methambelliferyl ⁇ -D-galactoside
- 4-methylmbelliferyl-pD-galactoside 4-methylumbelliferyl-pD-glucoside
- Other substances such as growth promoters, specifically glucose (10 g / l) were added to the mixtures of the nutritive compositions and enzymatic markers; inorganic salts, specifically monobasic potassium phosphate (5.5 g / l) and dibasic potassium phosphate (5.5 g / l).
- the selected nutritional composition, together with the enzymatic markers and other components are dissolved in the first solvent in amounts of 32.6 g / l.
- the nutritive mixtures together with the enzyme markers and other components dissolved in the first solvent are brought into contact with one and several three-dimensional structures of artificial ceramics, specifically the calcined hydroxyapatite and previously sterilized at 180 ° C for 60 min.
- the contact time of the composition is 30 min.
- This structure has a specific surface area of 5 x 10 3 m 2 / m 3 and is made up of a plurality of nano, micro- and macrocavities.
- the three-dimensional structure presents dimensions of the cavities corresponding to combinations of all the diameters or clearances of the cavities corresponding to nano-semimicro- and microcavities with diameters or clearances of 5 nm to 10 pm in the form of pores.
- These structures have a cylinder shape 100 cm in diameter and 2 cm high.
- the first solvent is removed by subjecting the three-dimensional structures to drying at a temperature of 60 ° C in a vacuum oven, for a period of 3 h.
- the ability to recover the target microorganisms is checked, demonstrating that the structures have detection limits of less than 1 CFU / 100 ml by filtering 1 I of an artificially inoculated E. coli suspension to a concentration of 6 CFU, that is per 100 milliliters. They have 0.6 CFU and can be detected by fluorescence and yellowing of the structure.
- the suspensions of the target microorganisms in isotonic saline solution in contact concentration of 3 x 10 6 CFU / ml are contacted with the three-dimensional structures in amounts of 1 ml and distributed on the surface.
- the three-dimensional structures are then maintained at temperatures of 35 ⁇ 2 ° C, under aerobic conditions for a period of up to 4 h, coinciding with the duration of the lag phase of E. coli growth.
- the presence of the target microorganisms in all variants is detected, in one case individually inoculated with each microorganism and in another case with the mixture of them.
- E. coli fluorescence and color change in the structure to yellowish are observed;
- E. coli 0157: H7 and Aeromonas hydrophila only the structure color change is observed.
- the detection is executed in 2 h.
- Enterococcus avium blue fluorescence is observed without a color change in the structure at 3 h and filamentous fungus grows as a black structure on the surface of the device, but yellow coloration can be seen in the growth zone.
- all reactions are appreciated.
- the S. aureus strain is tested as described in example 11, and according to V26 of that example, a nutritional composition and device is formed with the difference that the three-dimensional structure is shaped in the form of a 0.1 disc mm high and 60 cm in diameter.
- a volume of air of 3 m 3 is passed through the entire volume with the help of an air filtration device that sucks it by negative pressure.
- Contamination is simulated with the test strain at a concentration of 10 5 CFU / m 3 before filtering the air, to check if its flow influences the desiccation of the structure or its operation.
- the device When the device is exposed to air, it is moistened with the second solvent, consisting of distilled water and placed to incubate at the temperature and conditions described in Example 1 1.
- S. aureus can be identified after 240 min.
- One device is added ciprofloxacin in the amount of 0.003 pg and in another gentamicin in the amount of 0.2 pg. 0.2 ml of the microbial suspension of an E. coli strain isolated from urine culture with a concentration of 3 x 10 8 CFU / ml is inoculated and incubated for 4 h. The absence of E. coli growth is observed at 4 h in the device containing ciprofloxacin and fluorescence in the device containing gentamicin.
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- Proteomics, Peptides & Aminoacids (AREA)
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Abstract
Description
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Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP13767434.7A EP2837690B1 (en) | 2012-03-30 | 2013-03-27 | Method for simultaneous detection, recovery, identification and counting of microorganisms and three dimentioanl structure for the implementation of said method |
| CA2883197A CA2883197C (en) | 2012-03-30 | 2013-03-27 | Method for simultaneous detection, recovery, identification and counting of microorganisms and devices for the implementation of said method |
| ES13767434.7T ES2650453T3 (es) | 2012-03-30 | 2013-03-27 | Método para la detección, recuperación, identificación y conteo simultáneos de bacterias y hongos, y disposición de estructura tridimensional para la implementación de dicho método |
| MX2014011804A MX2014011804A (es) | 2012-03-30 | 2013-03-27 | Metodo para la deteccion, recuperacion, identificacion y enumeracion simultanea de microorganismos y dispositivos para su ejecucion. |
| BR112014024361-1A BR112014024361B1 (pt) | 2012-03-30 | 2013-03-27 | Método para a detecção, a recuperação, a identificação e a contagem simultâneas de micro-organismos e dispositivos para a sua implementação |
| RU2014143767A RU2644683C2 (ru) | 2012-03-30 | 2013-03-27 | Способ получения трехмерных структур, используемых для детекции, выделения или подсчета микроорганизмов |
| US14/389,568 US20150148258A1 (en) | 2012-03-30 | 2013-03-27 | Method for simultaneous detection, recovery, identification and counting of microorganisms and devices for the implementation of said method |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CU20120055A CU24137B1 (es) | 2012-03-30 | 2012-03-30 | Método para la detección, recuperación, identificación y enumeración simultánea de microorganismos |
| CUCU/P/2012/0055 | 2012-03-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2013143508A2 true WO2013143508A2 (es) | 2013-10-03 |
| WO2013143508A3 WO2013143508A3 (es) | 2014-05-08 |
Family
ID=49261336
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/CU2013/000002 Ceased WO2013143508A2 (es) | 2012-03-30 | 2013-03-27 | Método para la detección, recuperación, identificación y enumeración simultánea de microorganismos y dispositivos para su ejecución |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US20150148258A1 (es) |
| EP (1) | EP2837690B1 (es) |
| BR (1) | BR112014024361B1 (es) |
| CA (1) | CA2883197C (es) |
| CU (1) | CU24137B1 (es) |
| ES (1) | ES2650453T3 (es) |
| MX (1) | MX2014011804A (es) |
| RU (1) | RU2644683C2 (es) |
| WO (1) | WO2013143508A2 (es) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016085688A1 (en) * | 2014-11-25 | 2016-06-02 | 3M Innovative Properties Company | Devices and kits for the propagation or storage of microorganisms, and methods of making and using |
| RU2636620C1 (ru) * | 2016-10-25 | 2017-11-24 | Федеральное государственное бюджетное учреждение науки "Тюменский научный центр Сибирского отделения РАН" (ТюмНЦ СО РАН) | Способ оптической оценки концентрации микробных клеток в суспензии |
| US20190032001A1 (en) * | 2014-11-10 | 2019-01-31 | Charm Sciences,Inc. | Culture peel plate |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109182445B (zh) * | 2018-09-20 | 2021-10-22 | 吉林农业大学 | 一种霉菌和酵母计数测试片、制备方法及其应用 |
| JP7426725B2 (ja) * | 2018-10-30 | 2024-02-02 | Craif株式会社 | 細胞外小胞を捕捉するために用いられるデバイス、細胞外小胞の保存方法および移送方法 |
| CN110257468B (zh) * | 2019-06-03 | 2022-05-27 | 北京鑫骥金诺医疗器械有限公司 | 一种用于细菌计数的质控的组合物、制备方法及其应用 |
| CN112795486B (zh) * | 2020-12-30 | 2023-09-19 | 兴源环境科技股份有限公司 | 一种畜禽粪污微藻养殖同步产乙醇的方法 |
| CN114563396A (zh) * | 2022-01-26 | 2022-05-31 | 湖南农业大学 | 一种水中原核细胞型微生物总数现场快速检测试剂盒和检测方法 |
Citations (4)
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| US6596505B2 (en) | 2000-04-17 | 2003-07-22 | University Technologies International, Inc. | Apparatus and methods for testing effects of materials and surface coatings on the formation of biofilms |
| US20080095820A1 (en) | 2002-04-18 | 2008-04-24 | Kumta Prashant N | Method of manufacturing hydroxyapatite and uses therefor in delivery of nucleic acids |
| WO2009067012A2 (en) | 2007-11-23 | 2009-05-28 | Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tn0 | System for detecting microbial contamination |
| WO2011128488A1 (es) | 2010-04-16 | 2011-10-20 | Consejo Superior De Investigaciones Científicas (Csic) | Composición de silicatos de aluminio y nanopartículas de plata como bactericidas |
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| GB1520217A (en) * | 1977-01-11 | 1978-08-02 | Wyo Ben Products Inc | Inorganic support for culture media |
| US5009898A (en) * | 1988-09-29 | 1991-04-23 | Kabushiki Kaisha Sangi | Antimicrobial hydroxyapatite powders and methods for preparing them |
| US5705332A (en) * | 1994-04-25 | 1998-01-06 | University Of Hawaii | Detection and identification of Salmonella and Shigella |
| RU2139344C1 (ru) * | 1997-12-23 | 1999-10-10 | Научно-исследовательский институт эпидемиологии и микробиологии СО РАМН | Способ приготовления питательной среды для культивирования сальмонелл |
| CU22808A1 (es) * | 2000-04-18 | 2005-06-24 | Ct Nac Biopreparados | Composición y método para la detección y recuento diferenciado y temprano de organismos microscópicos gram-negativos |
| CU22844A1 (es) * | 2000-09-07 | 2004-02-20 | Ct Nac Biopreparados | Medio de cultivo y método para la identificación de microorgnismos gram-negativos |
| RU2260046C2 (ru) * | 2001-10-19 | 2005-09-10 | Институт Молекулярной Биологии Им. В.А. Энгельгардта Российской Академии Наук | Клеточный микрочип и его применение в способе исследования живых клеток |
| US20030138874A1 (en) * | 2001-11-09 | 2003-07-24 | Taintor Read Robert | Method and kit for rapid concurrent identification and antimicrobial susceptibility testing of microorganisms from broth culture |
| CA2634325A1 (en) * | 2005-12-19 | 2007-06-28 | Centro Nacional De Biopreparados | Nutrient medium for yeast culture |
| US8043845B2 (en) * | 2006-09-20 | 2011-10-25 | American Sterilizer Company | Sterilization indicator |
| US9212384B2 (en) * | 2006-09-28 | 2015-12-15 | Tsumara & Co. | Microbial culture medium and microbial culture method using acid/activated clay |
| US7745169B2 (en) * | 2006-11-10 | 2010-06-29 | Biolumix Inc. | Device and method for the detection and enumeration of multiple groups of microorganisms |
| US20110045470A1 (en) * | 2007-08-01 | 2011-02-24 | Hitachi Chemical Co., Ltd. | Pathogen detection in large-volume particulate samples |
| WO2012134724A1 (en) * | 2011-03-30 | 2012-10-04 | 3M Innovative Properties Company | Fluorogenic or fluorophoric compounds and uses thereof |
-
2012
- 2012-03-30 CU CU20120055A patent/CU24137B1/es unknown
-
2013
- 2013-03-27 EP EP13767434.7A patent/EP2837690B1/en active Active
- 2013-03-27 CA CA2883197A patent/CA2883197C/en active Active
- 2013-03-27 US US14/389,568 patent/US20150148258A1/en not_active Abandoned
- 2013-03-27 RU RU2014143767A patent/RU2644683C2/ru active IP Right Revival
- 2013-03-27 MX MX2014011804A patent/MX2014011804A/es unknown
- 2013-03-27 WO PCT/CU2013/000002 patent/WO2013143508A2/es not_active Ceased
- 2013-03-27 BR BR112014024361-1A patent/BR112014024361B1/pt active IP Right Grant
- 2013-03-27 ES ES13767434.7T patent/ES2650453T3/es active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6596505B2 (en) | 2000-04-17 | 2003-07-22 | University Technologies International, Inc. | Apparatus and methods for testing effects of materials and surface coatings on the formation of biofilms |
| US20080095820A1 (en) | 2002-04-18 | 2008-04-24 | Kumta Prashant N | Method of manufacturing hydroxyapatite and uses therefor in delivery of nucleic acids |
| WO2009067012A2 (en) | 2007-11-23 | 2009-05-28 | Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tn0 | System for detecting microbial contamination |
| WO2011128488A1 (es) | 2010-04-16 | 2011-10-20 | Consejo Superior De Investigaciones Científicas (Csic) | Composición de silicatos de aluminio y nanopartículas de plata como bactericidas |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20190032001A1 (en) * | 2014-11-10 | 2019-01-31 | Charm Sciences,Inc. | Culture peel plate |
| WO2016085688A1 (en) * | 2014-11-25 | 2016-06-02 | 3M Innovative Properties Company | Devices and kits for the propagation or storage of microorganisms, and methods of making and using |
| CN107002008A (zh) * | 2014-11-25 | 2017-08-01 | 3M创新有限公司 | 用于增殖或储存微生物的装置和套件及其制备和使用方法 |
| US10344253B2 (en) | 2014-11-25 | 2019-07-09 | 3M Innovative Properties Company | Devices and kits for the propagation or storage of microorganisms, and methods of making and using |
| CN107002008B (zh) * | 2014-11-25 | 2021-04-02 | 3M创新有限公司 | 用于增殖或储存微生物的装置和套件及其制备和使用方法 |
| RU2636620C1 (ru) * | 2016-10-25 | 2017-11-24 | Федеральное государственное бюджетное учреждение науки "Тюменский научный центр Сибирского отделения РАН" (ТюмНЦ СО РАН) | Способ оптической оценки концентрации микробных клеток в суспензии |
Also Published As
| Publication number | Publication date |
|---|---|
| US20150148258A1 (en) | 2015-05-28 |
| BR112014024361B1 (pt) | 2022-06-07 |
| CA2883197C (en) | 2020-03-31 |
| CA2883197A1 (en) | 2013-10-03 |
| CU20120055A7 (es) | 2013-12-27 |
| BR112014024361A2 (pt) | 2017-07-25 |
| RU2644683C2 (ru) | 2018-02-13 |
| EP2837690A2 (en) | 2015-02-18 |
| MX2014011804A (es) | 2015-03-19 |
| EP2837690B1 (en) | 2017-09-13 |
| CU24137B1 (es) | 2015-12-23 |
| RU2014143767A (ru) | 2016-05-27 |
| WO2013143508A3 (es) | 2014-05-08 |
| EP2837690A4 (en) | 2015-11-25 |
| BR112014024361A8 (pt) | 2022-03-08 |
| ES2650453T3 (es) | 2018-01-18 |
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