Electrochemical determination of ascorbic acid using the poly-cysteine film-modified electrode View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2009-10

AUTHORS

Xiaojiang Zheng, Dazhai Zhou, Dongshan Xiang, Wensheng Huang, Shaofang Lu

ABSTRACT

A poly(L-cysteine) thin film was prepared onto electrode surface via electropolymerization. In pH 7.0 phosphate buffer, L-cysteine was oxidized during the cyclic potential sweep between −0.60 and 2.00 V, forming a thin film at the glassy carbon electrode (GCE) surface. The electrochemical behaviors of ascorbic acid at the bare GCE and the poly(L-cysteine) film-coated GCE were investigated. The oxidation peak potential of ascorbic acid shifts to more negative potential at the poly(L-cysteine) film-modified GCE. Moreover, the oxidation peak current significantly increases at the poly(L-cysteine) film-modified GCE. These phenomena indicate that poly(L-cysteine) film shows highly-efficient catalytic activity to the oxidation of ascorbic acid. Based on this, a sensitive and simple electrochemical method was proposed for the determination of ascorbic acid. The oxidation peak current of ascorbic acid is proportional to its concentration over the range from 1.0 × 10−6 to 5.0 × 10−4 mol l−1. The limit of detection is evaluated to be 4.0 × 10−7 mol l−1. More... »

PAGES

1183

Identifiers

URI

http://scigraph.springernature.com/pub.10.1134/s1023193509100115

DOI

http://dx.doi.org/10.1134/s1023193509100115

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1005270372


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