Perfluorosulfonic acid polymer-coated indicator electrodes
First Claim
1. A flow-through enzyme reactor for the amperometric determination of a constituent of interest contained in a liquid sample, comprising:
- a first and a second end member, each having an internal chamber communicable with a source and a sink, respectively, of said liquid sample, said first and second chambers each having disposed therein a noble metal wire having coated thereon a thin film of a perfluorosulfonic acid polymer, said wires being externally connectable to electronic circuitry, said end members being made from an insulating material; and
a central member having an internal chamber adapted to contain an immobilized oxidase enzyme, said chamber in communication with said internal chambers of said end members, said central chamber being separated from each of said end chambers by a foraminous septum, said septum being capable of containing the immobilized enzyme within the central chamber, said central chamber being made from an inert, electrically conductive material.
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Abstract
A method is described for the amperometric determination of the concentration in a biological sample of a constituent which is a substrate for an oxidase enzyme by (1) catalyzing the substrate with the enzyme, thereby consuming O2 and producing H2 O2 and (2) measuring the O2 consumption or H2 O2 production by means of an inert metal indicator electrode intimately coated with a thin film of a perfluorosulfonic acid polymer.
A reaction chamber is described which provides means for contacting the sample with the enzyme and means for making amperometric measurements utilizing inert metal indicator electrodes coated with a thin film of a perfluorosulfonic acid polymer.
26 Citations
11 Claims
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1. A flow-through enzyme reactor for the amperometric determination of a constituent of interest contained in a liquid sample, comprising:
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a first and a second end member, each having an internal chamber communicable with a source and a sink, respectively, of said liquid sample, said first and second chambers each having disposed therein a noble metal wire having coated thereon a thin film of a perfluorosulfonic acid polymer, said wires being externally connectable to electronic circuitry, said end members being made from an insulating material; and a central member having an internal chamber adapted to contain an immobilized oxidase enzyme, said chamber in communication with said internal chambers of said end members, said central chamber being separated from each of said end chambers by a foraminous septum, said septum being capable of containing the immobilized enzyme within the central chamber, said central chamber being made from an inert, electrically conductive material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification