期刊
JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
卷 28, 期 5, 页码 909-915出版社
ELSEVIER
DOI: 10.1016/S0731-7085(01)00711-7
关键词
tryptophan; differential pulse voltammetry; carbon paste electrode
A simple, fast and sensitive method is proposed for Tryptophan (Trp) determination in pharmaceutical formulations containing other non-electroative aminoacids, vitamins and hydroxycobalamines. Optimized conditions for differential pulse voltammetry allowed the determination of Trp with detection limit of 1.7 muM in 2-30 mM linear dynamic range (n = 7; r = 0.999), at a bare, non-treated carbon paste electrode. Ascorbic acid interference was evaluated and eliminated by choosing a suitable baseline for determination of peak currents for Trp. (C) 2002 Elsevier Science B.V. All rights reserved.
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