Chemical code system using bio-sniffer with enzyme immobilized membrane

Abstract

A novel chemical code system was constructed with gas-phase biosensors (bio-sniffer) and a commercial inkjet printer. Two volatile chemicals, hydrogen peroxide (H₂O₂) and ethanol, were used for chemical code and printed by the inkjet printer. Each chemicals could be recognized by bio-sniffer fabricated with catalase and alcohol oxidase (AOD), respectively. Each bio-sniffer shoswed high selectivity due to the substrate specificity of the enzyme. Thus the combination of the sniffers was able to discriminate the inkjet printed 2-bit chemical code (4 patterns).