Journal
ELECTROANALYSIS
Volume 22, Issue 21, Pages 2558-2568Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/elan.201000270
Keywords
Cysteamine; Tryptophan; Carbon nanotubes; p-Aminophenol; Electrocatalytic effect; Voltammetry
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Funding
- Isfahan University of Technology (IUT) Research Council
- Center of Excellence in Sensor and Green Chemistry
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Determination of cysteamine and tryptophan is described by electrochemical methods using p-aminophenol-multiwall carbon nanotubes paste electrode. Cysteamine and tryptophan in mixture can each be measured independently from each other with a potential difference of 600 mV. The results showed that the electrocatalytic currents increased linearly with cysteamine and tryptophan concentrations over the ranges 0.5-300 mu mol L-1 and 10.0-650 mu mol L-1, respectively. The detection limits for cysteamine and tryptophan are found to be 0.14 and 5.9 mu mol L-1, respectively. The proposed method is successfully employed for the determination of cysteamine in both capsule and urine samples.
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