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Published on: January 30, 2015
Study on electrochemical behavior of tryptophan at a glassy carbon electrode modified with multi-walled carbon
1College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, China; Anhui Key Laboratory of Functional Molecular Solids, Wuhu 241000, China.
Abstract:
Electrochemical behavior of cerium hexacyanoferrate (CeHCF) incorporated on multi-walled carbon nanotubes (MWNTs) modified GC electrode is investigated by scanning electron microscopy (SEM) and electrochemical techniques. The CeHCF/MWNT/GC electrode showed potent electrocatalytic activity toward the electrochemical oxidation of tryptophan in phosphate buffer solution (pH 7.0) with a diminution of the overpotential of 240mV. The anodic peak currents increased linearly with the concentration of tryptophan in the range of 2.0x10(-7) to 1.0x10(-4)M with a detection limit of 2.0x10(-8)M (at a S/N=3). And the determination of tryptophan in pharmaceutical samples was satisfactory.
