Latin American applied research
versión impresa ISSN 0327-0793
MARTINEZ-HUITLE, C. A.; CARLESI JARA, C.; CERRO-LOPEZ, M. y 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.
Palabras clave : Cysteine; Sensor; Chitosan; Copper.