Properties of glucose sensors prepared by the electropolymerization of a positively charged pyrrole derivative

Amperometric glucose sensors were prepared by electropolymerization of a py rrole derivative having the positively charged group, 3-(1-pyrrolyl)propylt rimethylammonium bromide, in the presence of glucose oxidase on bare and Na fion-coated platinum electrodes. Linear relationships between the glucose c oncentration and the response current for the electrode with and without Na fion inner film were up to 10.0 and 6.0 mmol dm(-3), respectively. The intr oduction of Nafion inner film lowered the influence of electroactive compou nds, such as ascorbic acid, uric acid, and acetoaminophen, on the sensor re sponse, but was not able to eliminate the influence of these compounds suff iciently. However, Nafion inner film was effective in increasing the electr ode stability. The response current of the electrode with Nafion film remai ned stable for more than 50 days, while that without Nafion film was signif icantly reduced after 20 days of use. (C) 1999 Elsevier Science S.A. All ri ghts reserved.