Electrochemical Activity of Methionine at Graphite Electrode Modified with Gold Nanoparticles

Abstract:

The “inverse” cathodic peak of gold nanoparticles is observed in the reaction mixture used to obtain gold nanoparticles HAuCl₄:Na₃C₆H₅O₇:NaBH₄=125:8:1 and accumulation time is 90 s. The conditions in which methionine has the greatest electrochemical activity were determined. They are as follows: the molar ratio of reagents HAuCl₄:Na₃C₆H₅O₇:NaBH₄=125:8:1 and accumulation time is 90 s, 0.1 M NaOH. The mechanism of methionine oxidation is proposed to be on the surface of the graphite electrode modified with gold nanoparticles in 0.1 M NaOH. The determination limit of methionine is 0.7 •10^-14 M. The proposed method is simple, sensitive, and does not need toxic substances.

• Periodical: Key Engineering Materials (Volume 685)
• Pages: 563-568
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.685.563
• Online since: February 2016
• Authors: Daria Perevezentseva*, K.V. Skirdin, E.V. Gorchakov, V.I. Bimatov
• Keywords: Cyclic Voltammetry, Gold Nanoparticles, Graphite Electrode, Methionine

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