Microtubule Sensors and Sensor Array Based on Polyaniline Synthesized in the Presence of Poly(styrene sulfonate)
- 12 September 2003
- journal article
- Published by American Chemical Society (ACS) in Analytical Chemistry
- Vol. 75 (21), 5673-5679
- https://doi.org/10.1021/ac034537h
Abstract
Microtubule sensors for glucose, urea, and triglyceride were fabricated based on poly(styrene sulfonate)−polyaniline (PSS−PANI) composites synthesized within the pores of track-etched polycarbonate membranes. The synthesis of a sufficiently thick and conducting PSS−PANI film at pH 5 provided the advantage of immobilizing enzymes during polymerization. This resulted in the improvement of sensor response for urea and triglyceride by a factor of ∼102 with a significant increase in the linear region of response compared to polyaniline-based sensors, where the enzymes were immobilized by physical adsorption after the polymerization. The sensors based on urea and triglyceride were found to have a higher linear range of response, better sensitivity, improved multiple use capability, and faster response time compared to the potentiometric and amperometric sensors based on polyaniline. A microtubule sensor array for glucose, urea, and triglyceride based on PSS−PANI was fabricated by immobilization of three different sets of enzymes on three closely spaced devices and its response was found to be free from cross-interference when a sample containing a mixture of the above analytes was analyzed in a single measurement.Keywords
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