Issue 15, 2015

One-pot synthesis of graphene oxide coated with sol–gel for electrochemical determination of tryptophan

Abstract

Graphene oxide coated with sol–gel was prepared by a one-pot synthesis from phenyltriethoxysilane and tetramethoxysilane. The electrochemical behavior of tryptophan on the graphene/silicon oxide modified electrode was evaluated by differential pulse voltammetry (DPV). The oxidation peak current of tryptophan in phosphate buffer solution (pH = 7.0) at the modified electrode was linear in the range of 5.0 × 10−5 to 2.0 × 10−4 mol L−1 (r2 = 0.998) and 5.0 × 10−7 to 5.0 × 10−5 mol L−1 (r2 = 0.985) with a detection limit of 4.95 × 10−7 mol L−1 (S/N = 3). The modified electrodes showed good stability and reproducibility. The interference of glucose, ascorbic acid, tyrosine, glycine and cysteine was also studied.

Graphical abstract: One-pot synthesis of graphene oxide coated with sol–gel for electrochemical determination of tryptophan

Article information

Article type
Paper
Submitted
07 May 2015
Accepted
30 Jun 2015
First published
01 Jul 2015

Anal. Methods, 2015,7, 6352-6359

One-pot synthesis of graphene oxide coated with sol–gel for electrochemical determination of tryptophan

S. Kim, S. Sun, Y. Li and X. He, Anal. Methods, 2015, 7, 6352 DOI: 10.1039/C5AY01190F

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