4.7 Article

Electrochemical behavior and voltammetric determination of tryptophan based on 4-aminobenzoic acid polymer film modified glassy carbon electrode

Journal

COLLOIDS AND SURFACES B-BIOINTERFACES
Volume 74, Issue 1, Pages 167-171

Publisher

ELSEVIER
DOI: 10.1016/j.colsurfb.2009.07.013

Keywords

4-Aminobenzoic acid; Tryptophan; Electropolymerization; Voltammetry; Modified electrode

Funding

  1. National Natural Science Foundation of China [20805040]
  2. Natural Science Foundation of He'nan Province of China [082300420140]
  3. Foundation of He'nan Educational Committee [2008A150020]
  4. Program for Science & Technology Innovation Talents in Universities of Henan Province [2010HASTIT025]
  5. Foundation of Xinyang Normal University for Young Excellent Teachers
  6. Research Foundation for Young Teachers of Xinyang Normal University

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Herein, a novel electrochemical method was developed for the determination of tryptophan based on the poly(4-aminobenzoic acid) film modified glassy carbon electrode (GCE). The electrochemical behaviors of tryptophan at the modified electrode were investigated. It was found that the oxidation peak current of tryptophan at the modified GCE was greatly improved compared with that at the bare GCE. The effects of supporting electrolyte, pH value, scan rate, accumulation potential and time were examined. The oxidation peak current of tryptophan was proportional to its concentration over the range from 1.0 x 10(-6) to 1.0 x 10(-4) mol L-1. The limit of detection was evaluated to be 2.0 x 10(-7) mol L-1. The proposed method was sensitive and simple. It was successfully employed to determine tryptophan in pharmaceutical samples. (C) 2009 Elsevier B.V. All rights reserved.

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