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Which of these biosensors use the principle of heat released or absorbed by a reaction?

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Which of these biosensors use the principle of heat released or absorbed by a reaction?

(a) Potentiometric biosensor

(b) Optical biosensors

(c) Piezo-electric biosensors

(d) Calorimetric biosensors

The question was asked in a national level competition.

This intriguing question originated from Biosensors in portion pH Meters and Ion Analysers of Analytical Instrumentation

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Correct answer is (d) Calorimetric biosensors

To explain: Calorimetric biosensors use the principle of heat released or absorbed by a reaction. The heat is measured to determine the concentration.

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