ENHANCED LOADING OF GLUCOSE-OXIDASE ON POLYANILINE FILMS BASED ON ANION-EXCHANGE

The temporal aspects of anion self-exchange in electrochemically prepa red polyaniline films have been experimentally investigated. The excha nge of bulkier tosylate-ferricyanide ion with Cl- ion has been monitor ed by photometry and electrochemical techniques. The relative changes in porosity brought about by self-exchange have been experimentally de termined to be 323 and 2125/k in tosylate-exchanged and ferricyanide-e xchanged polyaniline films, respectively. Scanning electron microscopy has been used to delineate the surface morphology of polyaniline film s. It is seen that the polyaniline films exhibit enhanced loading of g lucose oxidase after a self-ion exchange, and, hence, they can be used for the fabrication of a third-generation glucose biosensor. (C) 1998 John Wiley & Sons, Inc.