Resumo

MARTINEZ-HUITLE, C. A.; CARLESI JARA, C.; CERRO-LOPEZ, M.  e  QUIROZ, M. A.. Cu-doped polymeric-modified electrode for determination of cysteine. Lat. Am. appl. res. [online]. 2010, vol.40, n.1, pp.47-51. ISSN 0327-0793.

A simple differential pulse voltammetric method based on chitosan modified glassy carbon was used to pre-concentrate copper ions in the chitosan film. After, this electrode was employed for the quantitative determination of cysteine. The modified electrode exhibits a clear improvement of the current response. The method allowed quantifying the analyte in the range in buffer solution and a limit of detection range from 1.0×10^-6 to 1.4×10^-6 M was achieved. This value seems quite higher than those previously published by other authors. The results are described and discussed in the light of the existing literature.

Palavras-chave : Cysteine; Sensor; Chitosan; Copper.

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