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Which of the following biosensor is a formaldehyde biosensor?

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Which of the following biosensor is a formaldehyde biosensor?

(a) Calorimetric biosensor

(b) Potentiometric biosensor

(c) Optical biosensor

(d) Piezo-electric biosensor

This question was posed to me during an online interview.

This key question is from Optical Biosensors and Piezoelectric Biosensors in chapter Biosensors of Enzyme Technology

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Correct answer is (d) Piezo-electric biosensor

Explanation: Formaldehyde biosensor is a piezo-electric biosensor that utilizes a formaldehyde dehydrogenase coating immobilised to a quartz crystal and sensitive to gaseous formaldehyde. Calorimetric biosensor involves measuring the heat generated during a reaction using thermistors. Potentiometric biosensors make use of ion-selective electrodes in order to transduce the biological reaction into an electrical signal. Optical biosensors involve determining changes in light absorption between the reactants and products of a reaction or measuring the light output.

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