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Voltammetric Determination of Tryptophan at a Single-Wall Carbon Nanotubes Modified Electrode

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Abstract:

A single-wall carbon nanotubes (SWNT)-film coated glassy carbon electrode (GCE) was described for the determination of tryptophan. In pH 2.5 Na2HPO4-citric acid buffer, tryptophan yields a well-defined and very sensitive oxidation peak at about 1.08 V at the SWNT-film coated GCE. The oxidation peak current increases greatly and the peak potential shifts toward more negative direction at the SWNT-modified GCE in contrast to that at the bare GCE. Under optimized conditions, the oxidation peak current is proportional to the concentration of tryptophan over the range from 4 × 10-8 to 1 × 10-5 mol/L. The detection limit is 1 × 10-8 mol/L at 3 min of accumulation. Using the proposed method, tryptophan in the human's blood serum samples was determined.

Keywords: CARBON NANOTUBES; DETERMINATION; MODIFIED ELECTRODE; TRYPTOPHAN; VOLTAMMETRY

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2004.122

Publication date: April 1, 2004

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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