EP0515623A1 - Procede et dispositif pour la mesure continue et reversible de la concentration d'une espece chimique - Google Patents

Procede et dispositif pour la mesure continue et reversible de la concentration d'une espece chimique

Info

Publication number
EP0515623A1
EP0515623A1 EP92900934A EP92900934A EP0515623A1 EP 0515623 A1 EP0515623 A1 EP 0515623A1 EP 92900934 A EP92900934 A EP 92900934A EP 92900934 A EP92900934 A EP 92900934A EP 0515623 A1 EP0515623 A1 EP 0515623A1
Authority
EP
European Patent Office
Prior art keywords
concentration
fluorescence
indicator
chemical species
radiation
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Withdrawn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
EP92900934A
Other languages
German (de)
English (en)
Inventor
Max Lippitsch
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.)
AVL Medical Instruments AG
Original Assignee
AVL Medical Instruments 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 AVL Medical Instruments AG filed Critical AVL Medical Instruments AG
Publication of EP0515623A1 publication Critical patent/EP0515623A1/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Withdrawn legal-status Critical Current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
    • G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
    • G01N31/22—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using chemical indicators
    • G01N31/221—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using chemical indicators for investigating pH value
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
    • G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
    • G01N21/64—Fluorescence; Phosphorescence
    • G01N21/6408—Fluorescence; Phosphorescence with measurement of decay time, time resolved fluorescence
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
    • G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
    • G01N21/64—Fluorescence; Phosphorescence
    • G01N21/6428—Measuring fluorescence of fluorescent products of reactions or of fluorochrome labelled reactive substances, e.g. measuring quenching effects, using measuring "optrodes"
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
    • G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
    • G01N21/64—Fluorescence; Phosphorescence
    • G01N21/6445—Measuring fluorescence polarisation

Definitions

  • the invention relates to a device and a method for the continuous and reversible measurement of the concentration of a chemical species with the aid of a fluorescence-optical indicator substance.
  • the object of the invention is to avoid the disadvantages mentioned and to provide a measuring device or a measuring method. propose, which combines the advantages of the decay time measurement with the technical advantages of the intensity measurement when using fluorescence-optical indicator substances.
  • the indicator substance is excited with polarized excitation radiation of a wavelength corresponding to the absorption of the indicator substance, that the intensity of the fluorescent radiation of the indicator substance is measured in two mutually normal polarization directions, that from the ratio of the intensities obtained the fluorescence anisotropy of the radiation is measured and the concentration of the chemical species is determined therefrom with the aid of a previously determined calibration curve.
  • the depolarization of the fluorescent radiation of an indicator which is dependent on the concentration of the chemical species, is used for the measurement.
  • Fluorescence depolarization is to be understood as the fact that after excitation of a molecule with radiation of a certain polarization direction, the. emitted fluorescence also contains radiation of the normal polarization component. The reason for this is the thermal movement of the molecules, which leads to the spatial direction of the excited molecular dipole changing during the decay time ⁇ of the excited state.
  • the fluorescence anisotropy r is defined as
  • the fluorescence anisotropy r has the following dependence on the decay time r of the excited state:
  • a prerequisite for the use of this measurement method is the use of media with low light scatter as a matrix for the indicator, since light scatter falsifies the anisotropy values.
  • a variant of the measuring method according to the invention therefore provides that a fluorescence indicator is used to measure the concentration of the chemical species, the fluorescence of which is quenched dynamically by the species to be measured, which shortens the fluorescence decay time T of the dye and the fluorescence anisotropy r according to equation (4 ) is reduced.
  • Efficient dynamic quenching of the fluorescence of organic fluorophores occurs when their fluorescence decay time is long (to> 100 ns). In order to achieve anisotropy sensitivity that is sufficient for sensor purposes, the time required for the rotation of the molecule must not be shorter.
  • V volume of the indicator molecules (cultivation of large side groups) or by a high microviscosity in the environment of the indicator.
  • Dynamic quenching takes place, for example, through oxygen, various anesthetic gases (eg halothane), halogenated hydrocarbons, halide and pseudohalide ions, sulfur dioxide, etc.
  • f (pH) means a function to be determined empirically. With this relationship there is a pH dependence of the anisotropy
  • a further embodiment of the invention therefore provides that a fluorescence indicator is used to measure the concentration of hydronium ions (pH measurement), the fluorescence decay time T of which is influenced by the concentration of the hydronium ions (by the pH value), as a result of which the luminescence anisotropy r changes according to equation (6).
  • a fluorescent dye with a pH-dependent fluorescence decay time serves as an indicator, for example acridine, salicylic aldehyde, indole-3-acetic acid, 9 (10H) -acridinone, 2-naphthol, etc.
  • a matrix material of low viscosity for example a hydrogel.
  • the measuring method according to the invention is also suitable for determining the concentration of, for example, potassium, sodium, lithium.
  • Indicator molecules to which the ions in question bind with high selectivity for example crown ether derivatives
  • the hydrodynamic volume of the indicator molecule changes as a result of the binding. Depending on the prevailing ion concentration, different proportions of the total number of indicator molecules present are present. If the hydrodynamic volume of the unbound indicator is designated as V 0 and that of the bound indicator as V j -, then the effective hydrodynamic volume applies
  • Another embodiment of the invention provides that a fluorescence indicator is used to measure the concentration of cations, the hydrodynamic volume V of which changes with the binding of the cations to be measured, as a result of which the fluorescence anisotropy r changes in accordance with equation (8).
  • the anisotropy depends not only on the properties of the indicator (fluorescence decay time, hydrodynamic molecular volume), but also on the microviscosity n of the surrounding matrix. This fact can be used e.g. to measure the viscosity of cell membranes. The microviscosity of a given matrix can in turn depend on the concentration of a certain chemical species S. Then it applies
  • n Q is the microviscosity in the absence of species S and f [S] is an empirically determined function. This then results for an indicator with a constant fluorescence decay time ⁇ 0
  • a fluorescence indicator present in a matrix substance can be used to measure the concentration of a chemical species in a sample, the fluorescence decay time of which is not influenced by the chemical species, but whose matrix substance depends on the concentration of the chemical species Micro viscosity n changes, whereby the fluorescence anisotropy r changes according to equation (10).
  • One process that can change the viscosity n of a matrix is e.g. swelling by including e.g. a liquid.
  • the specified measurement method is thus also usable for sensors of the kind which are of particular importance in environmental measurement technology.
  • the chemical species can also be water.
  • the indicator serves e.g. a hydrophobic dye molecule which does not interact with water to change the photophysical properties, e.g. a rhodamine.
  • the matrix used is e.g. PVC with plasticizer, which is known to have a state of swelling that depends on the water content.
  • a device for the continuous and reversible measurement of the concentration of a chemical species, with a fluorescent optical indicator substance that is at least indirectly in contact with the chemical species, which is possibly dissolved or immobilized in a matrix substance, with a radiation source for providing the excitation radiation, a measuring device for Detection of the fluorescence radiation as well as an evaluation device are provided for carrying out the measuring method according to the invention, in its simplest execution it is distinguished by the fact that a polarization filter is arranged between the radiation source and the indicator substance.
  • the measuring device for detecting the fluorescence radiation has two detectors, which are connected upstream of normal polarization filters, and that the signal outputs of the two detectors are connected to the evaluation unit in which the calibration functions required for determining the concentration are stored.
  • the measuring device prefferably has only one detector with an upstream polarization filter which can be switched into two positions which are normal to one another, the signal output of the detector being connected to the evaluation unit.
  • Fig. 1 shows a device according to the invention
  • Fig. 2 shows an embodiment of this.
  • An advantageous embodiment of the invention is to be illustrated using the example of an oxygen sensor in FIG. 1.
  • An indicator known per se for example an organic rudenium complex, pyrenebutyric acid or a polycyclic aromatic, is used.
  • the indicator I is dissolved or immobilized in a transparent, non-scattering carrier material or matrix substance T of high viscosity (for example a polymer).
  • the excitation takes place with a light source L of a suitable wavelength (for example light-emitting diode, laser or lamp with narrow-band filter).
  • the excitation light is linearly polarized by a polarization filter P ⁇ .
  • the fluorescence radiation is registered by two detectors D 1 # D (photodiodes) of the measuring device M, in front of which there are polarization filters P, P3, one of which is oriented in parallel P and the other normal P 3 to the direction of polarization of the excitation light.
  • the oxygen concentration is determined by comparison with a stored calibration curve and displayed digitally. Any filters in the beam path for separating excitation and fluorescent radiation are designated F ⁇ to F 3 .
  • the measuring device M has only one detector O j ⁇ with a polarization filter P 2 which can be switched to two positions that are normal to each other.

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Immunology (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Pathology (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Molecular Biology (AREA)
  • Biophysics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Optics & Photonics (AREA)
  • Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)
  • Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
  • Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)

Abstract

Pour la mesure continue et réversible de la concentration d'une espèce chimique au moyen d'un indicateur à fluorescence optique, il est proposé que l'indicateur soit excité avec un rayonnement d'excitation polarisé de longueur d'onde correspondant à l'absorption de l'indicateur, que l'intensité du rayonnement fluorescent de l'indicateur soit mesurée dans deux directions de polarisation normales l'une par rapport à l'autre, qu'on détermine l'anisotropie de la fluorescence du rayonnement à partir du rapport des intensités obtenues et qu'on calcule sur cette base, au moyen d'une courbe d'étalonnage préalablement déterminée, la concentration de l'espèce chimique.
EP92900934A 1990-12-12 1991-12-12 Procede et dispositif pour la mesure continue et reversible de la concentration d'une espece chimique Withdrawn EP0515623A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT251290 1990-12-12
AT2512/90 1990-12-12

Publications (1)

Publication Number Publication Date
EP0515623A1 true EP0515623A1 (fr) 1992-12-02

Family

ID=3535619

Family Applications (2)

Application Number Title Priority Date Filing Date
EP92901022A Expired - Lifetime EP0515625B1 (fr) 1990-12-12 1991-12-12 INDICATEUR D'UNE INSTALLATION DE MESURE A FLUORESCENCE OPTIQUE POUR LA MESURE DU pH D'UN ECHANTILLON ET DETECTEUR OPTIQUE COMPORTANT CET INDICATEUR
EP92900934A Withdrawn EP0515623A1 (fr) 1990-12-12 1991-12-12 Procede et dispositif pour la mesure continue et reversible de la concentration d'une espece chimique

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP92901022A Expired - Lifetime EP0515625B1 (fr) 1990-12-12 1991-12-12 INDICATEUR D'UNE INSTALLATION DE MESURE A FLUORESCENCE OPTIQUE POUR LA MESURE DU pH D'UN ECHANTILLON ET DETECTEUR OPTIQUE COMPORTANT CET INDICATEUR

Country Status (6)

Country Link
US (1) US5308581A (fr)
EP (2) EP0515625B1 (fr)
JP (2) JP2524460B2 (fr)
AT (1) ATE123572T1 (fr)
DE (1) DE59105671D1 (fr)
WO (2) WO1992010739A1 (fr)

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AT399595B (de) * 1993-06-09 1995-06-26 Avl Verbrennungskraft Messtech Lumineszenzoptischer indikator zur bestimmung der aktivität von alkalimetallionen in einer probenlösung
US5462879A (en) * 1993-10-14 1995-10-31 Minnesota Mining And Manufacturing Company Method of sensing with emission quenching sensors
NZ281315A (en) * 1994-03-25 1997-10-24 Novartis Ag Substituted From C Sensor for the optical determination of ions
US5577137A (en) * 1995-02-22 1996-11-19 American Research Corporation Of Virginia Optical chemical sensor and method using same employing a multiplicity of fluorophores contained in the free volume of a polymeric optical waveguide or in pores of a ceramic waveguide
US5567624A (en) * 1995-04-27 1996-10-22 Utah Medical Products, Inc. Carbazine dyes and derivatives for pH measurement
US7253557B2 (en) * 1996-02-08 2007-08-07 Bright Solutions, Inc. Light source provided with a housing enclosing voltage regulator means and method of manufacturing thereof
US6590220B1 (en) * 1996-02-08 2003-07-08 Bright Solutions, Inc. Leak detection lamp
US7335164B2 (en) 1996-07-15 2008-02-26 Ntc Technology, Inc. Multiple function airway adapter
US6815211B1 (en) 1998-08-04 2004-11-09 Ntc Technology Oxygen monitoring methods and apparatus (I)
US20070225612A1 (en) * 1996-07-15 2007-09-27 Mace Leslie E Metabolic measurements system including a multiple function airway adapter
US6325978B1 (en) 1998-08-04 2001-12-04 Ntc Technology Inc. Oxygen monitoring and apparatus
AU5079698A (en) * 1996-10-08 1998-05-05 Photonics Biosystems Microbiological assessment method and device utilizing oxygen gradient sensing
US20050101032A1 (en) * 1997-02-10 2005-05-12 Metrika, Inc. Assay device, composition, and method of optimizing assay sensitivity
WO1999001737A2 (fr) * 1997-06-10 1999-01-14 Calspan Corporation Detection des matieres d'un agent chimique par utilisation d'un polymere sorbant et sonde a fluorescence
US20060019404A1 (en) * 1998-05-06 2006-01-26 Blatt Joel M Quantitative assay with extended dynamic range
US6300638B1 (en) 1998-11-12 2001-10-09 Calspan Srl Corporation Modular probe for total internal reflection fluorescence spectroscopy
DE19919091C2 (de) * 1999-04-27 2002-01-17 Zeiss Carl Jena Gmbh Anordnung zur Einstellung der Laserleistung und/oder der Pulslänge eines Kurzpulslasers in einem Mikroskop
US20030211011A1 (en) * 2001-06-08 2003-11-13 Phillips Terry E. Ph sensor system and method for using same
US7198756B2 (en) * 2002-07-11 2007-04-03 Optical Sensors Incorporated Non-invasive measurement of pH
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US20050227370A1 (en) * 2004-03-08 2005-10-13 Ramel Urs A Body fluid analyte meter & cartridge system for performing combined general chemical and specific binding assays

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Also Published As

Publication number Publication date
EP0515625B1 (fr) 1995-06-07
JPH05503368A (ja) 1993-06-03
US5308581A (en) 1994-05-03
JPH05503367A (ja) 1993-06-03
WO1992010740A1 (fr) 1992-06-25
EP0515625A1 (fr) 1992-12-02
JP2524460B2 (ja) 1996-08-14
DE59105671D1 (de) 1995-07-13
WO1992010739A1 (fr) 1992-06-25
ATE123572T1 (de) 1995-06-15

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