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Fabrication of Chitosan‐Multiwall Carbon Nanotube Nanocomposite Containing Ferri/Ferrocyanide: Application for Simultaneous Detection of D ‐Penicillamine and Tryptophan
Author(s) -
Chekin Fereshteh,
Raoof JahanBakhsh,
Bagheri Samira,
Hamid Sharifah Bee Abd
Publication year - 2012
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.201200138
Subject(s) - chitosan , carbon nanotube , nanocomposite , chemistry , cyclic voltammetry , dielectric spectroscopy , electrode , electrochemistry , ferrocyanide , nuclear chemistry , detection limit , analytical chemistry (journal) , glassy carbon , nanotube , chemical engineering , nanotechnology , materials science , organic chemistry , chromatography , engineering
Abstract We report a simple and effective strategy for fabrication of the nanocomposite containing chitosan (CS) and multiwall carbon nanotube (MWNT) coated on a glassy carbon electrode (GCE). The characterization of the modified electrode (CS‐MWNT/GC) was carried out using scanning electron microscopy (SEM) and UV–vis absorption spectroscopy. The electrochemical behavior of CS‐MWNT/GC electrode was investigated and compared with the electrochemical behavior of chitosan modified GC (CS/GC), multiwalled carbon nanotube modified GC (MWNT/GC) and unmodified GC using cyclic voltammetry (CV) and electron impedance spectroscopy (EIS). The chitosan films are electrochemically inactive; similar background charging currents are observed at bare GC. The chitosan films are permeable to anionic Fe(CN) 6 3−/4− (FC) redox couple. Electrochemical parameters, including apparent diffusion coefficient for the Fe(CN) 6 3−/4− redox probe at FC/CS‐MWNT/GC electrode is comparable to values reported for cast chitosan films. This modified electrode also showed electrocatalytic effect for the simultaneous determination of D ‐penicillamine ( D ‐PA) and tryptophan (Trp). The detection limit of 0.9 μM and 4.0 μM for D ‐PA and Trp, respectively, makes this nanocomposite very suitable for determination of them with good sensitivity.

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