EP1407040A2 - Dispositif et procede pour mettre en evidence une inhibition de la photosynthese - Google Patents

Dispositif et procede pour mettre en evidence une inhibition de la photosynthese

Info

Publication number
EP1407040A2
EP1407040A2 EP02743243A EP02743243A EP1407040A2 EP 1407040 A2 EP1407040 A2 EP 1407040A2 EP 02743243 A EP02743243 A EP 02743243A EP 02743243 A EP02743243 A EP 02743243A EP 1407040 A2 EP1407040 A2 EP 1407040A2
Authority
EP
European Patent Office
Prior art keywords
planar layer
cells
cell parts
layer
photosynthesis
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP02743243A
Other languages
German (de)
English (en)
Inventor
Wolfgang Kreiss
Mark Wilhelm Drewes
Günther EBERZ
Norbert Caspers
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bayer Innovation GmbH
Original Assignee
Bayer CropScience AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bayer CropScience AG filed Critical Bayer CropScience AG
Publication of EP1407040A2 publication Critical patent/EP1407040A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/5097—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving plant cells
    • 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
    • C12Q1/025—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving viable microorganisms for testing or evaluating the effect of chemical or biological compounds, e.g. drugs, cosmetics

Definitions

  • the geometry of the test device is an obstacle to massive parallelization and miniaturization. Again, mixtures of substances can only be assessed summarily.
  • EP 588 139 AI describes a test for mixtures of substances. The biological
  • the effect of the substances in a mixture of substances is checked by a combination of chromatographic separation of the mixture of substances into the substances to be tested into chromatographic zones and a subsequent test of the biological effect (toxicity) of the individual separated fractions.
  • the individual fractions are in contact with
  • Luminous microorganisms brought by a local change in their bio luminescence on the individual fractions indicate the biological effect of this fraction.
  • EP 1 043 582 A2 The possibility of parallelizing and miniaturizing effect tests is described in EP 1 043 582 A2.
  • a sensor layer which consists of a diffusion-controlling matrix and effect sensors suspended therein. When this sensor layer comes into contact with samples, the biological activity of the test substances is indicated by optical signals.
  • the object of the invention is to provide a device and a method for the detection of photosynthesis-inhibiting substances, which enables a significantly higher sample throughput and a miniaturization compared to the prior art.
  • the object of the invention is achieved by a method for detecting the photosynthesis-inhibiting action of substances comprising the steps
  • test substance to the planar layer or in the planar
  • the cells can be made from algae, microalgae, bacteria, in particular cyanobacteria with a photosynthesis system, plant cell cultures or plant homogenates come.
  • the procedure also works with cells that are damaged in their vitality as long as an intact Photosystem II (PS II) is present.
  • PS II Photosystem II
  • the cells can also come from selected mutants or from genetically modified organisms.
  • the planar layer is preferably a gel layer.
  • the planar layer preferably has a thickness in the range from 0.1 mm to 10 mm.
  • the introduction of the cells or the cell parts into a planar layer can be done by embedding e.g. of green algae in agarose or acrylate gels or other gel formers or viscous media.
  • test substance is applied to the planar layer or into the planar layer, for example by means of syringe techniques or by pin tools or suitable printing techniques (jet systems etc.), preferably in the form of spots.
  • Luminescence is fluorescence and / or phosphorescence (time-delayed luminescence).
  • the measurement of the phosphorescence offers advantages compared to the fluorescence measurement, since there is no effort for the discrimination of excitation and emission.
  • fluorescence measurement has the advantage of greater sensitivity to detection.
  • Both white light sources are suitable as excitation light sources, e.g. Halogen light or fluorescent tubes as well as light sources that emit in a narrow spectral range, e.g. LEDs.
  • Daylight can also serve as the excitation light source.
  • the excitation can take place continuously or in a pulsed mode (pulse modulation technique).
  • the detection is carried out with instruments which are capable of imaging the emitted luminescence in the wavelength range of> 680 nm with sufficient sensitivity (eg Vidicon system, CCD camera, scanner, phosphor imager, photographic film). Time-resolved light measurements can also be carried out, if necessary, together with pulsed excitation and correlation of excitation and measurement.
  • instruments which are capable of imaging the emitted luminescence in the wavelength range of> 680 nm with sufficient sensitivity (eg Vidicon system, CCD camera, scanner, phosphor imager, photographic film).
  • Time-resolved light measurements can also be carried out, if necessary, together with pulsed excitation and correlation of excitation and measurement.
  • an additional exposure or a dark phase can be used to control the photosynthetic activity.
  • Photosynthesis-inhibiting test substances which are applied to or in the planar layer according to the invention influence the luminescence behavior of the photosynthesis pigment complex. Spots of
  • Photosynthesis inhibitors such as atrazine can be e.g. by significantly weakening the time-delayed luminescence (phosphorescence) with video imaging methods, simply and simultaneously prove its effect for a large number of spots.
  • the increased fluorescence of the photopigments when the photosynthesis system II is inhibited can also serve to image the PS II-active substance spots.
  • the invention further relates to a system for the detection of the photosynthesis-inhibiting action of substances according to the method according to the invention, containing
  • Excitation light source for excitation of the luminescence of the cells or of the cell parts in the planar layer
  • Detector for measuring the luminescence of the cells or cell parts in the planar layer - evaluation means for assigning the detector signal to the degree of photosynthesis inhibition.
  • the means for applying the test substance to the planar layer or into the planar layer can be, for example, syringe systems, steel needles (pin tools) or suitable pressure stamps and jet systems.
  • the evaluation can be done visually or by means of suitable image processing techniques.
  • the invention further relates to a test strip or sensor chip for detecting the photosynthesis-inhibiting effect of substances according to the inventive method containing a planar layer with cells or cell parts with an intact photosystem, after the application of the test substance to the planar layer or in the planar layer, and subsequent excitation of the luminescence of the cells or cell parts in the planar layer by an excitation light source, and measurement of the luminescence of the cells or cell parts in the planar layer with a detector from which the degree of photosynthesis inhibition can be determined from the detector signal.
  • the planar layer of the test strip or sensor chip preferably consists of green algae in agarose or acrylate gels. In this way, stable detection layers can be produced, which retain their function as a test system for the photosynthesis-inhibiting effect even when stored for longer periods.
  • An advantage of the method according to the invention is a high level of miniaturization and parallelization of the detection method for photosynthesis-inhibiting substances.
  • a high sample throughput can be achieved by the parallelization.
  • the spatially resolving action detection enables photosynthesis-inhibiting substances as components of mixtures of substances to be identified without interference in thin-layer chromatograms or electropherograms by first subjecting the mixture of substances to a chromatographic or electrophoretic separation on a thin-layer chromatography plate or an electrophoresis layer and then using the process according to the invention Claim 15 the photosynthesis-inhibiting effect of the fractions is examined.
  • the spatially resolving action detection also makes it possible to apply photosynthesis-inhibiting substances to different locations on a support and to investigate the photosynthesis-inhibiting action of these spots using the method according to the invention.
  • the method according to the invention can be used in drug discovery to optimize photosynthesis inhibitors.
  • Another area of application is, for example, the specific measurement of herbicidal activity in wastewater and environmental samples due to pollutants.
  • a thin agarose layer (approx. 4 mm layer height) in which green algae (Scenedesmus subspicatus) had been suspended was used to detect the photosynthesis-inhibiting effect.
  • the green algae were grown as follows:
  • the algae are inoculated from a preserve of Scenedesmus subspicatus into a sterile 100 ml Erlenmeyer flask containing 50 ml of culture medium.
  • the solution is then incubated at 23 ° C. and at 125 rpm in a climatic cabinet equipped with fluorescent tubes under the action of light for 7 days.
  • the growth medium contains: 58 mg / 1 sodium carbonate
  • 25 ml of the algae suspension (optical density approx. 2 mAU) are homogeneously mixed with 15 ml of 1% agarose MP solution (Boehringer Mannheim GmbH Art. No. 1388983) at temperatures below 40 ° C. Before cooling, this suspension is placed in a single well plate (Nalge Nunc, Omni Tray Single Well 86 x 128 mm).
  • a gel layer with uniformly suspended algae forms there on cooling.
  • This detection layer can be used immediately or after several weeks of storage to measure the photosynthesis inhibitory effect.
  • test substances from a microtiter plate were stamped onto the algal layer using a 96-fold pin tool (Nalge Nunc 96 pin replicator).
  • the sample assignment of the microtiter plate (see Table 1) also defines the position of the respective substance on the algal layer.
  • the test substances were in the microtiter plate as a DMSO solution (100 ⁇ mol
  • Table 1 Parallel detection of the effect of substances by fluorescence imaging on a 96-well microtiter plate with an algae layer
  • a video imaging system (Molecular Light Imager NightOWL from PerkinElmer Life Sciences) was used to record the fluorescence image.
  • the single well plate was placed on a light table, the white light source of which was limited to a wavelength below 475 nm using a filter (Omega 475 RDF 40).
  • the camera lens was equipped with a filter that allows light above 680 nm to pass (Andover P / N: 680FS 10-50). The fluorescence excitation and the camera recording took place simultaneously for a period of 1 second. The evaluation of the
  • the fluorescence image shows 22 bright spots (see Figure 1).
  • the substances deposited there cause an increase in fluorescence due to their interaction with the photosystem.
  • Metamitron a known photosynthesis inhibitor, with the amounts 50 ng, 125 ng and 250 ng was applied to positions F12, G12, H12 as reference substance. All noticed in this parallel assay
  • the algae layer was produced as in Example 1.
  • the same test substances as in Example 1 and in identical positioning were applied to the algal layer.
  • the incubation was also carried out for 15 minutes.
  • a video imaging system (Molecular Light Imager NightOWL from PerkinElmer Life Sciences) was used to record the phosphorescence image.
  • the NUNC plate was placed on a light table that was equipped with a white light source. No filters were used in front of the camera lens to record the phosphorescent light.
  • the algae layer was exposed for 90 seconds to stimulate phosphorescence. After a waiting time of 15 seconds, the camera was recorded with a recording time of 30 seconds.
  • the phosphorescence image was evaluated visually on the screen of the video imaging system.
  • TIFF files were formatted and labeled with suitable graphics programs (Adobe Photoshop 5.0, MS Powerpoint
  • the phosphorescence image shows 22 dark spots (see Figure 2).
  • the substances deposited there cause a faster decay of the phosphorescence due to their interaction with the photosystem.
  • Metamitron a known photosynthesis inhibitor, with the amounts 50 ng, 125 ng and 250 ng was applied to positions F12, G12, H12 as reference substance. The results are in good agreement with the results of fluorescence imaging (see also Example 1). All substances found in this parallel assay are inhibitors of the

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Immunology (AREA)
  • Organic Chemistry (AREA)
  • Molecular Biology (AREA)
  • Wood Science & Technology (AREA)
  • Urology & Nephrology (AREA)
  • Analytical Chemistry (AREA)
  • Proteomics, Peptides & Aminoacids (AREA)
  • Biotechnology (AREA)
  • Physics & Mathematics (AREA)
  • Microbiology (AREA)
  • Hematology (AREA)
  • Medicinal Chemistry (AREA)
  • Bioinformatics & Cheminformatics (AREA)
  • Zoology (AREA)
  • Biochemistry (AREA)
  • Biomedical Technology (AREA)
  • General Health & Medical Sciences (AREA)
  • Food Science & Technology (AREA)
  • Genetics & Genomics (AREA)
  • General Engineering & Computer Science (AREA)
  • Cell Biology (AREA)
  • Toxicology (AREA)
  • Biophysics (AREA)
  • Pathology (AREA)
  • General Physics & Mathematics (AREA)
  • Botany (AREA)
  • Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
  • Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)
  • Measuring Or Testing Involving Enzymes Or Micro-Organisms (AREA)
  • Apparatus Associated With Microorganisms And Enzymes (AREA)
  • Investigating Or Analysing Biological Materials (AREA)

Abstract

L'invention concerne un procédé, un système et une bande test permettant de détecter des substances ayant une action inhibitrice de la photosynthèse. Selon l'invention, on prépare des cellules ou des parties de cellules présentant un photosystème intact, on introduit ces cellules ou parties de cellules dans une couche plane, on applique la substance d'essai sur ou dans cette couche plane, on active la luminescence des cellules ou des parties de cellules dans la couche plane au moyen d'une source de lumière d'excitation, on mesure la luminescence des cellules ou des parties de cellules dans la couche plane au moyen d'un détecteur et on associe le signal du détecteur à un degré d'inhibition de la photosynthèse.
EP02743243A 2001-07-09 2002-06-26 Dispositif et procede pour mettre en evidence une inhibition de la photosynthese Withdrawn EP1407040A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10133273A DE10133273A1 (de) 2001-07-09 2001-07-09 Vorrichtung und Verfahren zum Nachweis der Photosynthese-Hemmung
DE10133273 2001-07-09
PCT/EP2002/007057 WO2003006684A2 (fr) 2001-07-09 2002-06-26 Dispositif et procede pour mettre en evidence une inhibition de la photosynthese

Publications (1)

Publication Number Publication Date
EP1407040A2 true EP1407040A2 (fr) 2004-04-14

Family

ID=7691152

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02743243A Withdrawn EP1407040A2 (fr) 2001-07-09 2002-06-26 Dispositif et procede pour mettre en evidence une inhibition de la photosynthese

Country Status (5)

Country Link
US (2) US7333195B2 (fr)
EP (1) EP1407040A2 (fr)
JP (1) JP2004533853A (fr)
DE (1) DE10133273A1 (fr)
WO (1) WO2003006684A2 (fr)

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DE102004027118B4 (de) * 2004-06-03 2006-05-11 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren zum Nachweis des photokatalytischen Abbaus organischer Farbstoffe mittels Fluoreszenzanalyse
US8821431B2 (en) * 2007-09-07 2014-09-02 Beta O2 Technologies Ltd. Air gap for supporting cells
US20100022393A1 (en) * 2008-07-24 2010-01-28 Bertrand Vick Glyphosate applications in aquaculture
US9446168B2 (en) 2010-06-07 2016-09-20 Beta-O2 Technologies Ltd. Multiple-layer immune barrier for donor cells
US9540630B2 (en) * 2008-09-17 2017-01-10 Beta O2 Technologies Ltd. Optimization of alginate encapsulation of islets for transplantation
US8940340B2 (en) * 2009-01-22 2015-01-27 Aurora Algae, Inc. Systems and methods for maintaining the dominance of Nannochloropsis in an algae cultivation system
US9187778B2 (en) 2009-05-04 2015-11-17 Aurora Algae, Inc. Efficient light harvesting
US9029137B2 (en) 2009-06-08 2015-05-12 Aurora Algae, Inc. ACP promoter
US20100325948A1 (en) * 2009-06-29 2010-12-30 Mehran Parsheh Systems, methods, and media for circulating and carbonating fluid in an algae cultivation pond
RU2426779C1 (ru) * 2009-11-13 2011-08-20 Российская Федерация, От Имени Которой Выступает Министерство Образования И Науки Российской Федерации Биосенсор на основе клеток микроводорослей для определения тяжелых металлов и гербицидов в водных системах
US8940520B2 (en) 2010-05-20 2015-01-27 Pond Biofuels Inc. Process for growing biomass by modulating inputs to reaction zone based on changes to exhaust supply
US8969067B2 (en) 2010-05-20 2015-03-03 Pond Biofuels Inc. Process for growing biomass by modulating supply of gas to reaction zone
US8889400B2 (en) 2010-05-20 2014-11-18 Pond Biofuels Inc. Diluting exhaust gas being supplied to bioreactor
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US9534261B2 (en) 2012-10-24 2017-01-03 Pond Biofuels Inc. Recovering off-gas from photobioreactor
JP7193087B2 (ja) * 2019-02-15 2022-12-20 国立研究開発法人国立環境研究所 光合成阻害物質混入検出装置及び光合成阻害物質混入検出方法

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Also Published As

Publication number Publication date
US20040178358A1 (en) 2004-09-16
WO2003006684A3 (fr) 2003-05-01
JP2004533853A (ja) 2004-11-11
US20080169431A1 (en) 2008-07-17
DE10133273A1 (de) 2003-01-30
US7333195B2 (en) 2008-02-19
WO2003006684A2 (fr) 2003-01-23

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