EP0842292A1 - Procede permettant de mesurer la concentration d'une enzyme par mesure de l'absorption photometrique d'un colorant forme de maniere enzymatique dans une solution de mesure - Google Patents

Procede permettant de mesurer la concentration d'une enzyme par mesure de l'absorption photometrique d'un colorant forme de maniere enzymatique dans une solution de mesure

Info

Publication number
EP0842292A1
EP0842292A1 EP96927021A EP96927021A EP0842292A1 EP 0842292 A1 EP0842292 A1 EP 0842292A1 EP 96927021 A EP96927021 A EP 96927021A EP 96927021 A EP96927021 A EP 96927021A EP 0842292 A1 EP0842292 A1 EP 0842292A1
Authority
EP
European Patent Office
Prior art keywords
solution
enzyme
dye
concentration
stop
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.)
Ceased
Application number
EP96927021A
Other languages
German (de)
English (en)
Inventor
Renate Weckermann
Elke SEIDEL-MÜLLER
Detlef Hintzen
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.)
BRAHMS Diagnostica GmbH
Original Assignee
BRAHMS Diagnostica GmbH
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 BRAHMS Diagnostica GmbH filed Critical BRAHMS Diagnostica GmbH
Publication of EP0842292A1 publication Critical patent/EP0842292A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • C12Q1/34—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving hydrolase
    • C12Q1/42—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving hydrolase involving phosphatase
    • 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
    • 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
    • C12Q2334/00—O-linked chromogens for determinations of hydrolase enzymes, e.g. glycosidases, phosphatases, esterases
    • C12Q2334/10—O-linked chromogens for determinations of hydrolase enzymes, e.g. glycosidases, phosphatases, esterases p-Nitrophenol derivatives

Definitions

  • the invention relates to an improved method for measuring the concentration of an enzyme, in which the concentration of the enzyme is determined by photometrically measuring in a measuring solution the concentration of a dye formed enzymatically by the reaction of the enzyme with a substrate solution determined a light absorption measurement.
  • the invention relates to the determination of an enzyme that originates from a biological sample or is present as a label of a reaction partner of an enzyme immunoassay, with the aid of which physiologically important biomolecules in biological samples are determined.
  • the invention relates to the field of enzyme immunoassays, in particular those enzyme immunoassays in which the enzyme label bound to a reaction partner of the detection system is alkaline phosphatase, which, when controlled, acts on a p-nitrophenyl phosphate.
  • Substrate leads to the formation of the yellow dye p-nitrophenol, its presence and amount is measured photometrically at an absorption maximum of 405 nm after the enzymatic dye-forming reaction has ended by adding an aqueous stop solution, usually a 2n or 3n sodium hydroxide solution or an aqueous EDTA solution.
  • an aqueous stop solution usually a 2n or 3n sodium hydroxide solution or an aqueous EDTA solution.
  • the invention relates equally to the determination of enzymes in biological samples, especially if they use comparable dye formation for enzyme measurement.
  • the invention also relates to a stop solution as part of a kit for an enzyme determination in biological samples or a determination of an analyte based on the principle of an enzyme immunoassay if this solution contains the dye amaranth dissolved.
  • Enzyme immunoassays for the purposes of the present description are all immunoassays for the determination of antigens, haptens, antibodies, including autoantibodies, and other biomolecules in which an enzyme label is used to label a test component serving as a tracer, the present application specifically the describes preferred use of alkaline phosphatase as an enzyme label.
  • the component of the test system serving as a tracer can be a labeled antigen which competes with the antigen to be determined, for example, for the binding sites of an antibody immobilized on a solid phase, but the tracer component can also be a labeled specific antibody or universal anti-species.
  • part of the tracer component used which is labeled with the enzyme alkaline phosphatase, is bound to a solid phase.
  • the solid phase can be any solid phase used in the present field, ie it can be particulate or microdisperse or it can be the wall of the test vessel, eg the test tube or the cavity of a microtiter plate. After the immunological reaction has been carried out, this solid phase is separated from the liquid phase of the reaction mixture and washed.
  • a solid solution is added to the solid phase, which is usually a p-nitrophenyl phosphate solution if an enzyme label in the form of alkaline phosphatase is used.
  • the solid phase is incubated with the substrate solution for a predetermined time, and then the dye-forming reaction is stopped by adding a stop solution. After the stop solution has been added, the amount of the enzymatically formed dye is measured photometrically.
  • EDTA ethylenediaminetetraacetic acid
  • BAP bone-specific alkaline phosphatase
  • the enzymatic reaction is stopped by adding a stop solution without the appearance of the measuring solution being changed thereby. It is an object of the present invention to improve the practical implementation of methods for the determination of enzymes, including the determination of enzymes which are label-bound to a reaction partner of an enzyme immunoassay, in such a way that simple and immediate control over the correct stopping is achieved the dye-forming enzymatic reaction is possible without the measuring accuracy of the determination method being impaired.
  • This object is achieved in a method for measuring the concentration of an enzyme, in which the concentration of the enzyme is determined by determining the concentration of a dye formed enzymatically by the reaction of the enzyme with a substrate solution in a measuring solution by means of a light absorption measurement, Solved according to the invention in that the photometric determination is carried out in the presence of a further dye which is added to the measuring solution together with a stop solution to stop the enzymatic dye-forming reaction and whose presence is used to measure the concentration of the enzymatic formed dye does not interfere.
  • the added further dye is added to the measurement solution with a conventional aqueous stop solution to stop dye formation in a p-nitrophenylphosphate substrate under the action of alkaline phosphatase, which is present as a label of a reaction partner of an enzyme immunoassay .
  • the dye used is preferably amaranth.
  • Amaranth also naphthol red S
  • the solution of the dye amaranth in a sodium hy hydroxide solution is deep red.
  • the color change immediately shows whether a stop solution has already been added to a developed substrate solution or not. Without the stop solution, the substrate solution is yellow; after adding the stop solution, it is dark orange to red.
  • the photometric evaluation is usually carried out at a wavelength of 405 nm, which corresponds to a pronounced maximum of the absorption spectrum of p-nitrophenol.
  • a dye such as amaranth
  • the photometric is Measurement of the developed substrate as possible in the case of adding an undyed stop solution, although the measured solution differs significantly from the eye due to a different color from a customary developed and / or stopped substrate solution.
  • amaranth concentrations in 2N NaOH are, for example, between 5 and 50 ⁇ g / ml, a concentration of 20 ⁇ g / ml, as used in the control experiments described below, having proven very suitable.
  • a colored stop solution ensures, in a simple and safe manner, immediate visual control of the correct execution of the assay without the correctness of the results of the determination method being adversely affected.
  • the figure shows in a single diagram the spectra of the dye amaranth in a 2N NaOH stop solution and a typical spectrum of a p-nitrophenylphosphate substrate solution after development by alkaline phosphatase, which is bound to an immobilized tracer component of an enzyme immunoassay .
  • the determination of the neopterin concentration in a biological sample is carried out by allowing the neopterin to be determined from the sample to compete with an enzyme conjugate of neopterin and alkaline phosphatase for the binding sites of anti-neopterin antibodies which are immobilized on a solid phase, usually the walls of the cavities of a microtiter plate.
  • the extent of the binding of the enzyme conjugate of neopterin and alkaline phosphatase to the solid phase is inversely proportional to the neopterin concentration in a patient sample.
  • High neopterin values in the sample thus manifest themselves as low optical density (OD) after the subsequent substrate development in the photometric measurement of the substrate solution obtained.
  • the optical density is measured in a plate photometer with an absorption maximum of 405 nm.
  • the results of the measurement of the optical density of a sample are evaluated with reference to a standard curve (optical density versus concentration of neopterin standards), from which the neopterin concentration of a patient sample can be read directly.
  • the usual stop solution was an aqueous 2N NaOH solution.
  • the inked stop solution was prepared by reacting 0.2 g of a commercially available Amaranth dye (Amaranth SiCO pharm-85 E 123; BASF) in 40 ml of a 2N NaOH solution (stop solution elitest ® neopterin) dissolved. The solution obtained was further diluted 1: 250 with 2N NaOH. It had a concentration of 20 ⁇ g amaranth / ml 2N NaOH.
  • each patient serum was first mixed with 150 ⁇ l of a solution of a conjugate of neopterin and alkaline phosphatase in the cavities of an uncoated microtiter plate according to the work instructions. 150 ⁇ l of the mixture obtained were then transferred to a microtiter plate coated with neopterin antibodies.
  • the mixture was incubated at room temperature for 30 + 5 min and the reaction was then stopped by adding 100 ⁇ l of a 2N NaOH stop solution, either an unstained or a colored stop solution according to the invention.
  • the optical density was then measured in a plate photometer (Titertek Multiscan Plus MKII) at a wavelength of 405 nm, and the measurement results were evaluated on the basis of a standard curve which had been prepared under the same conditions using standards of known neopterin concentration.
  • Pat1 9.7 9.8 9.7 9.8
  • Pat3 7.4 6.7 7.4 6.7
  • Pat 8 13.9 15.3 13.9 15.3
  • Pat 9 6.7 5.7 6.7 5.7
  • Pat 12 13.1 13.9 13.1 .13.9
  • Pat 13 3.7 3.6 3.7 3.6
  • Pat 16 28.5 31.1 28.5 31.1

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Zoology (AREA)
  • Wood Science & Technology (AREA)
  • Proteomics, Peptides & Aminoacids (AREA)
  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Microbiology (AREA)
  • Immunology (AREA)
  • Physics & Mathematics (AREA)
  • Molecular Biology (AREA)
  • Biotechnology (AREA)
  • Biophysics (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • Bioinformatics & Cheminformatics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Health & Medical Sciences (AREA)
  • Genetics & Genomics (AREA)
  • Measuring Or Testing Involving Enzymes Or Micro-Organisms (AREA)

Abstract

L'invention concerne un procédé permettant de mesurer la concentration d'une enzyme. A cette fin, la concentration d'un colorant formé de manière enzymatique par réaction de l'enzyme avec une solution substrat est déterminée de manière photométrique dans une solution de mesure, par mesure de l'absorption de la lumière. La détermination photométrique s'effectue en présence d'un autre colorant ajouté à la solution de mesure, et dont la présence n'affecte pas la mesure de la concentration du colorant formé de manière enzymatique. Lorsque la mesure met en évidence la présence de phosphatase alcaline, sur la base d'un échantillon biologique ou d'un immuno-essai enzymatique, on utilise de préférence pour colorant de l'amarante qui est ajouté à la solution de mesure de préférence conjointement avec une solution d'arrêt, afin d'arrêter la réaction produisant le colorant de manière enzymatique.
EP96927021A 1995-07-25 1996-07-16 Procede permettant de mesurer la concentration d'une enzyme par mesure de l'absorption photometrique d'un colorant forme de maniere enzymatique dans une solution de mesure Ceased EP0842292A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19527160 1995-07-25
DE1995127160 DE19527160C1 (de) 1995-07-25 1995-07-25 Verfahren zur Messung der Konzentration eines Enzyms durch photometrische Absorptionsmessung eines enzymatisch gebildeten Farbstoffs in einer Meßlösung
PCT/EP1996/003126 WO1997005273A1 (fr) 1995-07-25 1996-07-16 Procede permettant de mesurer la concentration d'une enzyme par mesure de l'absorption photometrique d'un colorant forme de maniere enzymatique dans une solution de mesure

Publications (1)

Publication Number Publication Date
EP0842292A1 true EP0842292A1 (fr) 1998-05-20

Family

ID=7767749

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96927021A Ceased EP0842292A1 (fr) 1995-07-25 1996-07-16 Procede permettant de mesurer la concentration d'une enzyme par mesure de l'absorption photometrique d'un colorant forme de maniere enzymatique dans une solution de mesure

Country Status (3)

Country Link
EP (1) EP0842292A1 (fr)
DE (1) DE19527160C1 (fr)
WO (1) WO1997005273A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU8334698A (en) * 1997-07-15 1999-02-10 Kem-En-Tec A/S Pre-stained 3,3',5,5'-tetramethylbenzidine substrates for the detection of enzyme activity
DE19919539C5 (de) * 1999-04-29 2004-12-09 Gerhard Lewandovski Verfahren zur Messung der Aktivität einer biologisch wirksamen Substanz in einem histologischen Präparat
US6942964B1 (en) 1999-07-09 2005-09-13 Sigma-Aldrich Co. Tracer reagents that enhance reaction-product analysis
AU2000272733A1 (en) * 2000-08-08 2002-02-18 Gerhard Lewandovski Method and device for measuring the activity of a biologically active substance in a histological preparation

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3438683A1 (de) * 1984-10-22 1986-04-24 Boehringer Mannheim Gmbh, 6800 Mannheim Verfahren zur bestimmung von peroxidase
US4822746A (en) * 1986-06-25 1989-04-18 Trustees Of Tufts College Radiative and non-radiative energy transfer and absorbance modulated fluorescence detection methods and sensors
DE3639279C3 (de) * 1986-10-24 1996-06-20 Behringwerke Ag Verfahren zur quantitativen Bestimmung von Antikörpern oder Antigenen nach der ELISA-Methode durch photometrische Auswertung
DE4216002C2 (de) * 1991-05-13 1994-11-17 Fzb Biotechnik Gmbh Verfahren zur Bestimmung des Dextrangehaltes in Zucker, in zuckerhaltigen Lösungen, Säften und Sirupen sowie Test-Kit zur Dextranbestimmung
DE4120412C1 (fr) * 1991-06-20 1993-01-07 Henning Berlin Gmbh Chemie- Und Pharmawerk, 1000 Berlin, De
DE4243375C2 (de) * 1992-12-21 1998-04-23 Brahms Diagnostica Gmbh Bestimmungsverfahren zur Bestimmung von Antikörpern in biologischen Flüssigkeiten
DE4442460C1 (de) * 1994-11-29 1996-03-07 Brahms Diagnostica Gmbh Verfahren zur selektiven Bestimmung des Gehalts eines Enzyms in einer biologischen Probe, insbesondere zur selektiven Bestimmung von knochenspezifischer alkalischer Phosphatase

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9705273A1 *

Also Published As

Publication number Publication date
DE19527160C1 (de) 1997-01-23
WO1997005273A1 (fr) 1997-02-13

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