Study on electrochemical behavior of tryptophan at a glassy carbon electrode modified with multi-walled carbon nanotubes embedded cerium hexacyanoferrate |
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Authors: | Bin Fang Yan Wei Maoguo Li Guangfeng Wang Wei Zhang |
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Institution: | a College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, China b Department of Chemistry, Wannan Medical College, Wuhu 241000, PR China c Anhui Key Laboratory of Functional Molecular Solids, Wuhu 241000, China |
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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 240 mV. The anodic peak currents increased linearly with the concentration of tryptophan in the range of 2.0 × 10−7 to 1.0 × 10−4 M with a detection limit of 2.0 × 10−8 M (at a S/N = 3). And the determination of tryptophan in pharmaceutical samples was satisfactory. |
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Keywords: | Cerium hexacyanoferrate Multi-walled carbon nanotubes Modified electrode Tryptophan Electroanalysis |
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