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In glucose electrode, glucose oxidase has been coupled to an electrode by which of the following materials?

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In glucose electrode, glucose oxidase has been coupled to an electrode by which of the following materials?

(a) Ferrocene derivatives

(b) Urease

(c) Polyacrylamide

(d) Biochips

I have been asked this question in an interview for job.

The query is from Biosensors in section pH Meters and Ion Analysers of Analytical Instrumentation

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The correct choice is (a) Ferrocene derivatives

The best I can explain: In glucose electrode, glucose oxidase has been coupled to an electrode by using ferrocene derivatives. It is used to measure blood glucose in diabetic patients.

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