Gas-sensors with high selectivity using a biological catalytic system

Abstract

Gas-phase biosensors were constructed using a unique reaction cell with both gas and liquid phase compartments separated by a diaphragm membrane and an immobilized enzyme electrode with alcohol oxidase, aldehyde dehydrogenase and flavin-containing monooxygenase for measurement of ethanol, acetaldehyde and trimethylamine, respectively. The gas sensors possessed high selectivity for their analyte vapor in the presence of other gas phase chemicals and gave a negligible response to these chemicals.