✦ LIBER ✦

A Study of the Electrochemistry of Carnosine Based on the Coupling Reaction with Diazo-p-aminoacetophenone

✍ Scribed by Xiao Ping Wu; Jian Ping Duan; Hong Qing Chen; Guo Nan Chen

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 132 KB
Volume: 11
Category: Article
ISSN: 1040-0397
DOI: 10.1002/(sici)1521-4109(199907)11:9<641::aid-elan641>3.0.co;2-a

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✦ Synopsis

Carnosine could be determined in the range between 1.0610 À7 and 5.5610 À6 M by differential pulse adsorptive stripping voltammetry (DPASV) on a static mercury electrode after derivatization with diazo-p-aminoacetophenone (DPAAP) at pH 9.6±9.7. The detection limit was 6.8610 À8 M, the relative standard deviation (n 10) for 5.0610 À6 M of carnosine was 1.8 %. The coupling reaction and electrochemical reaction mechanism of azo-carnosine were investigated by structure analysis, UV spectroscopic, cyclic voltammetry, DPASV and electrocapillary at mercury electrodes. A reversible two-electron via two-proton redox and adsorption-controlled process occurred in four consecutive steps with an intermediate at the mercury electrode.

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