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N ‐(3,4‐Dihydroxyphenethyl)‐3,5‐dinitrobenzamide‐Modified Multiwall Carbon Nanotubes Paste Electrode as a Novel Sensor for Simultaneous Determination of Penicillamine, Uric acid, and Tryptophan
Author(s) -
Ensafi Ali A.,
KarimiMaleh Hassan,
Mallakpour Shadpour
Publication year - 2011
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.201000741
Subject(s) - carbon nanotube , electrode , carbon paste electrode , tryptophan , uric acid , electrochemical gas sensor , nuclear chemistry , chemistry , detection limit , materials science , inorganic chemistry , electrochemistry , cyclic voltammetry , chromatography , nanotechnology , biochemistry , amino acid
N ‐(3,4‐dihydroxyphenethyl)‐3,5‐dinitrobenzamide modified multiwall carbon nanotubes paste electrode was used as a voltammetric sensor for oxidation of penicillamine (PA), uric acid (UA) and tryptophan (TP). In a mixture of PA, UA and TP, those voltammograms were well separated from each other with potential differences of 300, 610, and 310 mV, respectively. The peak currents were linearly dependent on PA, UA and TP concentrations in the range of 0.05–300, 5–420, and 1.0–400 µmol L −1 , with detection limits of 0.021, 2.0, and 0.82 µmol L −1 , respectively. The modified electrode was used for the determination of those compounds in real samples.