Which of the following biosensor is a formaldehyde biosensor?

Which of the following biosensor is a formaldehyde biosensor? Correct Answer Piezo-electric biosensor

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.