✦ LIBER ✦

Cholesterol sensor based on electrodeposition of catalytic palladium particles

✍ Scribed by Shaojun Dong; Qing Deng; Guangjin Cheng

Publisher: Elsevier Science
Year: 1993
Tongue: English
Weight: 455 KB
Volume: 279
Category: Article
ISSN: 0003-2670
DOI: 10.1016/0003-2670(93)80322-c

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✦ Synopsis

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A layer of palladium particles was electrodeposited on a glassy carbon electrode. The dispersed Pd particles resulted in a large decrease in overvoltage for the electrochemical oxidation of HzOz down to + 0.4 V vs. Ag/AgCl, based on which a new hind of cholesterol sensor was fabricated. Cholesterol oxidase was immobilized on the Pd-dispersed electrode by cross-linking with glutaraldehyde and a layer of poly<o-phenylenediamine) (PPD) film was electropolymerized on the enzyme layer. The sensor shows a linear response in the concentration range 0.05-4.50 mm01 1-r with a rapid response of less than 20 s. The polymer film can prevent interference from uric acid and ascorbic acid and also increases the thermal stability of the sensor. The sensor can be used for 200 assays without an obvious decrease in activity.

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We thank Enichem for financial support and The Dow Chemical Company for the permission to publish these results. We also thank Dr. C. Querci (Polimeri Europa, Istituto Donegani) for helpful discussions.