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A Voltammetric Sensor Based on Modified Multiwall Carbon Nanotubes for Cysteamine Determination in the Presence of Tryptophan Using p ‐Aminophenol as a Mediator
Author(s) -
Ensafi Ali A.,
KarimiMaleh Hassan
Publication year - 2010
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201000270
Subject(s) - cysteamine , tryptophan , electrochemistry , chemistry , carbon nanotube , electrochemical gas sensor , electrode , nuclear chemistry , chromatography , inorganic chemistry , materials science , organic chemistry , nanotechnology , biochemistry , amino acid
Abstract 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 µmol L −1 and 10.0–650 µmol L −1 , respectively. The detection limits for cysteamine and tryptophan are found to be 0.14 and 5.9 µmol L −1 , respectively. The proposed method is successfully employed for the determination of cysteamine in both capsule and urine samples.