Method for the colorimetric determination of an analyte with a PQQ-dependent dehydrogenase
First Claim
1. A method for the colorimetric determination of an analyte, comprising,enzymatically oxidizing an analyte with an oxidoreductase in the presence of a direct electron acceptor, wherein said direct electron acceptor is an electron-rich aromatic nitroso compound,wherein the electron-rich aromatic nitroso compound is reduced enzymatically in the presence of a pyrrolo-quinoline quinone (PQQ)-dependent dehydrogenase to an imino compound with concomitant oxidation of the analyte without further enzymatic reduction to an aromatic amine,reacting said imino compound with a non-oxidative chromogenic detection reagent, andmeasuring any color formation.
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Abstract
The invention concerns a method for the colorimetric determination of an analyte by means of enzymatic oxidation with a PQQ-dependent dehydrogenase in the presence of an electron acceptor from the group of the electron-rich aromatic nitroso compounds by enzymatic reduction of the nitroso compound to an imino compound and detection of the imino compound by color formation. In addition the invention concerns a corresponding agent containing a PQQ-dependent dehydrogenase, an electon-rich aromatic nitroso compound as well as, if desired, a detection reagent for imino compounds. The invention in addition concerns novel nitrosoamino compounds which form colored quinone diimines on reduction as well as their use for the colorimetric enzymatic determination of an analyte.
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Citations
32 Claims
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1. A method for the colorimetric determination of an analyte, comprising,
enzymatically oxidizing an analyte with an oxidoreductase in the presence of a direct electron acceptor, wherein said direct electron acceptor is an electron-rich aromatic nitroso compound, wherein the electron-rich aromatic nitroso compound is reduced enzymatically in the presence of a pyrrolo-quinoline quinone (PQQ)-dependent dehydrogenase to an imino compound with concomitant oxidation of the analyte without further enzymatic reduction to an aromatic amine, reacting said imino compound with a non-oxidative chromogenic detection reagent, and measuring any color formation.
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14. A method for the colorimetric determination of an analyte, comprising,
enzymatically oxidizing an analyte with an oxidoreductase in the presence of a direct electron acceptor, wherein said direct electron acceptor is an electron-rich aromatic nitroso compound, wherein the electron-rich aromatic nitroso compound is reduced in the presence of a POO-dependent dehydrogenase to a colored imino compound without further enzymatic reduction to an aromatic amine with concomitant oxidation of the analyte, and measuring any color formation of the imino compound, wherein said electron rich aromatic nitroso compound is a compound of the general formula XIII: - ##STR47## wherein R1 is selected from the group consisting of hydrogen, hydroxy, halogen, alkoxy, alkylthio, aryloxy, arylthiol, an alkyl which is unsubstituted or substituted by hydroxy, carboxy, PO3 H2 or SO3 H, an amino which is unsubstituted or substituted at least once by an alkyl which in turn is unsubstituted or substituted by hydroxy, PO3 H2, dialkylphosphinyl, SO3 H or carboxy,
X-Y is selected from the group consisting of NR5 --CO and N═
CR6,R5 is selected from the group consisting of hydrogen, an alkyl which is unsubstituted or substituted by hydroxy, carboxy, SO3 H, PO3 H2, and dialkylphosphinyl, R6 is selected from the group consisting of hydrogen, alkyl, alkenyl, alkoxy, alkylthio, aryl, arylthio, aralkyl, and an amino which is unsubstituted or substituted by one or two alkyl residues which are in turn unsubstituted or substituted with at least one hydroxy, carboxy, or alkoxycarbonyl residue, wherein said alkyl, alkenyl, alkoxy, alkylthio, aryl, arylthio, and aralkyl are unsubstituted or substituted by hydroxy, carboxy, SO3 H, PO3 H2, a salt of SO3 H, a salt of PO3 H2, or alkoxycarbonyl, A is a saturated or unsaturated chain consisting of three members selected from the group consisting of nitrogen, sulphur and carbon, wherein the carbon atoms are unsubstituted or substituted by alkyl, alkoxy, alkylthio, hydroxy, aralkyl, aryl, carboxy, carboxamido, alkoxycarbonyl, cyano, halogen, an amino which is unsubstituted or substituted by one or two alkyl residues which in turn are substituted or unsubstituted with at least one hydroxy, carboxy or alkoxycarbonyl residue and wherein any nitrogen atoms that are not bound via a double bond are substituted by hydrogen, aralkyl, or an alkyl which is unsubstituted or substituted by SO3 H2, PO3 H2, carboxy or dialkylphosphinyl, as well as corresponding tautomeric forms and their salts, which react enzymatically to form a colored quinone diimine as a measure of the amount of the analyte. - View Dependent Claims (15, 16, 17)
- ##STR47## wherein R1 is selected from the group consisting of hydrogen, hydroxy, halogen, alkoxy, alkylthio, aryloxy, arylthiol, an alkyl which is unsubstituted or substituted by hydroxy, carboxy, PO3 H2 or SO3 H, an amino which is unsubstituted or substituted at least once by an alkyl which in turn is unsubstituted or substituted by hydroxy, PO3 H2, dialkylphosphinyl, SO3 H or carboxy,
- 20. A reagent for the colorimetric determination of an analyte by enzymatic oxidation of said analyte, comprising PQQ-dependent dehydrogenase, an electron-rich aromatic nitroso compound, and a color-forming, non-oxidative detection reagent for imino compounds.
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29. A reagent for the colorimetric determination of an analyte by enzymatic oxidation of the analyte, comprising a PQQ-dependent dehydrogenase and an electron-rich aromatic nitroso compound, wherein the electron-rich aromatic nitroso compound is a nitrosoaniline compound of formula XIII, ##STR54## wherein R1 is selected from the group consisting of hydrogen, hydroxy, halogen, alkoxy, alkylthio, aryloxy, arylthiol, an alkyl which is unsubstituted or substituted by hydroxy, carboxy, PO3 H2 or SO3 H, an amino which is unsubstituted or substituted at least once by an alkyl which in turn is unsubstituted or substituted by hydroxy, PO3 H2, dialkylphosphinyl, SO3 H or carboxy,
X-Y is selected from the group consisting of NR5 --CO and N═ - CR6,
R5 is selected from the group consisting of hydrogen, an alkyl which is unsubstituted or substituted by hydroxy, carboxy, SO3 H, PO3 H2, and dialkylphosphinyl, R6 is selected from the group consisting of hydrogen, alkyl, alkenyl, alkoxy, alkylthio, aryl, arylthio, aralkyl, and an amino which is unsubstituted or substituted by one or two alkyl residues which are in turn unsubstituted or substituted with at least one hydroxy, carboxy, or alkoxycarbonyl residue, wherein said alkyl, alkenyl, alkoxy, alkylthio, aryl, arylthio, and aralkyl are unsubstituted or substituted by hydroxy, carboxy, SO3 H, PO3 H2, a salt of SO3 H, a salt of PO3 H2, or alkoxycarbonyl, A is a saturated or unsaturated chain consisting of three members selected from the group consisting of nitrogen, sulphur and carbon, wherein the carbon atoms are unsubstituted or substituted by alkyl, alkoxy, alkylthio, hydroxy, aralkyl, aryl, carboxy, carboxamido, alkoxycarbonyl, cyano, halogen, an amino which is unsubstituted or substituted by one or two alkyl residues which in turn are substituted or unsubstituted with at least one hydroxy, carboxy or alkoxycarbonyl residue and wherein any nitrogen atoms that are not bound via a double bond are substituted by hydrogen, aralkyl, or an alkyl which is unsubstituted or substituted by SO3 H2, PO3 H2, carboxy or dialkylphosphinyl, as well as corresponding tautomeric forms and their salts. - View Dependent Claims (30, 31)
- CR6,
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32. A reagent for the colorimetric determination of an analyte by enzymatic oxidation of the analyte, comprising a PQQ-dependent dehydrogenase and an electron-rich aromatic nitroso compound, wherein the electron-rich aromatic nitroso compound is a nitrosoaniline compound of formula XIII:
- ##STR55## wherein R1 is selected from the group consisting of hydrogen, hydroxy, halogen, alkoxy, alkylthio, aryloxy, arylthiol, an alkyl which is unsubstituted or substituted by hydroxy, carboxy, PO3 H2 or SO3 H, an amino which is unsubstituted or substituted at least once by an alkyl which in turn is unsubstituted or substituted by hydroxy, PO3 H2, dialkylphosphinyl, SO3 H or carboxy,
X-Y is selected from the group consisting of NR5 --CO and N═
CR6,R5 is selected from the group consisting of hydrogen, an alkyl which is unsubstituted or substituted by hydroxy, carboxy, SO3 H, PO3 H2, and dialkylphosphinyl, R6 is selected from the group consisting of hydrogen, alkyl, alkenyl, alkoxy, alkylthio, aryl, arylthio, aralkyl, and an amino which is unsubstituted or substituted by one or two alkyl residues which are in turn unsubstituted or substituted with at least one hydroxy, carboxy, or alkoxycarbonyl residue;
wherein said alkyl, alkenyl, alkoxy, alkylthio, aryl, arylthio, and aralkyl are unsubstituted or substituted by hydroxy, carboxy, SO3 H, PO3 H2, a salt of SO3 H, a salt of PO3 H2, or alkoxycarbonyl,A is a saturated or unsaturated chain consisting of three members selected from the group consisting of nitrogen, sulphur and carbon, wherein the carbon atoms are unsubstituted or substituted by alkyl, alkoxy, alkylthio, hydroxy, aralkyl, aryl, carboxy, carboxamido, alkoxycarbonyl, cyano, halogen, an amino which is unsubstituted or substituted by one or two alkyl residues which in turn are substituted or unsubstituted with at least one hydroxy, carboxy or alkoxycarbonyl residue and wherein any nitrogen atoms that are not bound via a double bond are substituted by hydrogen, aralkyl, or an alkyl which is unsubstituted or substituted by SO3 H2, PO3 H2, carboxy or dialkylphosphinyl;
wherein two adjacent chain substituents form an alkylene group which is unsubstituted or substituted by aryl or is anellated,as well as corresponding tautomeric forms and their salts.
- ##STR55## wherein R1 is selected from the group consisting of hydrogen, hydroxy, halogen, alkoxy, alkylthio, aryloxy, arylthiol, an alkyl which is unsubstituted or substituted by hydroxy, carboxy, PO3 H2 or SO3 H, an amino which is unsubstituted or substituted at least once by an alkyl which in turn is unsubstituted or substituted by hydroxy, PO3 H2, dialkylphosphinyl, SO3 H or carboxy,
Specification