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What is represented in the following diagram? (a)Amperometric biosensor

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What is represented in the following diagram?

(a) Amperometric biosensor

(b) Piezo-electric biosensor

(c) Potentiometric biosensor

(d) Calorimetric biosensor

I got this question in an online interview.

I'm obligated to ask this question of Potentiometric Biosensors topic in chapter Biosensors of Enzyme Technology

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The correct option is (c) Potentiometric biosensor

To explain I would say: The diagram below represents a simple potentiometric biosensor with its parts.

A simple potentiometric biosensor has a semi-permeable membrane surrounding the biocatalyst which is entrapped next to the active glass membrane of a pH probe. The electrical potential generated between the internal Ag/AgCl electrode bathed in dilute HCl and an external reference electrode is given by ‘e’.

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