Journal
IONICS
Volume 19, Issue 6, Pages 933-940Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11581-012-0816-7
Keywords
L-Cysteine; Folic acid; Carbon nanotubes paste electrode; Voltammetry
Funding
- Science and Research Branch, Islamic Azad University, Mazandaran
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This paper reports the selective and sensitive voltammetric determination of l-cysteine in the presence of folic acid using ethynylferrocene modified carbon nanotubes paste electrode in 0.1 M phosphate buffer solution (pH 7.0). Using square wave voltammetry, we could measure l-cysteine and folic acid in one mixture independently from each other by a potential difference of about 410 mV for the first time. Square wave voltammetric peak current of l-cysteine and folic acid increased linearly with their concentrations in the ranges of 0.2-250.0 and 1.0-500.0 mu mol L-1, respectively. The detection limits of 0.07 and 0.6 mu mol L-1 were achieved for l-cysteine and folic acid, respectively. The proposed voltammetric sensor was successfully applied to the determination of l-cysteine and folic acid in real samples.
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