Enzyme electrode and a method of determining concentration of an analyte in a sample solution
First Claim
Patent Images
1. An enzyme electrode comprising:
- (a) an electrochemical transducer device for detecting variation of a phase boundary potential,(b) an enzyme-immobilized membrane wherein an enzyme and carboxyl groups are immobilized, said carboxyl groups acting as a buffering agent against an acid produced by an enzyme reaction, and(c) a permeation-restricted membrane having a restricted permeability to an analyte but having a good permeability to oxygen and being formed by material comprising an albumin crosslinked by glutaraldehyde;
said enzyme-immobilized membrane (b) and permeation-restricted membrane (c) being formed on the surface of said electrochemical transducer device (a) in the named order.
0 Assignments
0 Petitions
Accused Products
Abstract
An enzyme electrode usable for determining high concentration of analyte in a sample solution is provided, by providing an enzyme-immobilized membrane in the electrode with pH buffer capacity. Durability of the electrode can be improved by using albumin crosslinked by glutaraldehyde as a permeation-restricted membrane in the electrode. Method of using the electrode can be simplified by introducing a stirring step, measuring outputs before and after the stirring step and utilizing difference of measured outputs.
39 Citations
5 Claims
-
1. An enzyme electrode comprising:
-
(a) an electrochemical transducer device for detecting variation of a phase boundary potential, (b) an enzyme-immobilized membrane wherein an enzyme and carboxyl groups are immobilized, said carboxyl groups acting as a buffering agent against an acid produced by an enzyme reaction, and (c) a permeation-restricted membrane having a restricted permeability to an analyte but having a good permeability to oxygen and being formed by material comprising an albumin crosslinked by glutaraldehyde; said enzyme-immobilized membrane (b) and permeation-restricted membrane (c) being formed on the surface of said electrochemical transducer device (a) in the named order. - View Dependent Claims (3)
-
-
2. An enzyme electrode comprising:
-
(a) an electrochemical transducer device for detecting variation of a phase boundary potential, (b) an enzyme-immobilized membrane formed by a layer (b1) of a material for immobilizing and containing carboxyl groups, said carboxyl groups acting as an agent for buffering against an acid produced by an enzyme reaction, and a layer (b2) of an immobilized enzyme, said layers (b1) and (b2) being formed on the surface of the electrochemical transducer device (a) in the named order, and (c) a permeation-restriction membrane having a permeability restricted to an analyte but having a good permeability relative to oxygen and being formed by material comprising an albumin crosslinked by glutaraldehyde; said enzyme-immobilized membrane (b) and permeation-restricted membrane (c) being formed on the surface of said electrochemical transducer device (a) in the named order. - View Dependent Claims (4)
-
-
5. A method of determining a concentration of an analyte in a sample solution by means of an enzyme electrode comprising:
- (a) an electrochemical transducer device for detecting a variation of a phase boundary potential, (b) an enzyme-immobilized membrane wherein an enzyme and carboxyl groups are immobilized, said carboxyl groups acting as a buffering agent against an acid produced by an enzyme reaction, and (c) a permeation-restriction membrane having a restricted permeability to an analyte but having a good permeability relative to oxygen;
said enzyme-immobilized membrane (b) and permeation-restricted membrane (c) being formed on the surface of said electrochemical transducer device (a) in the named order, which method comprises the steps of;(i) immersing said enzyme electrode in the sample solution for a predetermined time period, (ii) stirring the sample solution, and (iii) measuring a difference of electrode outputs between before the stirring and after the stirring, to determine a concentration of the analyte in the sample solution.
- (a) an electrochemical transducer device for detecting a variation of a phase boundary potential, (b) an enzyme-immobilized membrane wherein an enzyme and carboxyl groups are immobilized, said carboxyl groups acting as a buffering agent against an acid produced by an enzyme reaction, and (c) a permeation-restriction membrane having a restricted permeability to an analyte but having a good permeability relative to oxygen;
Specification