Catalytic Oxidation of Glucose with Hydrogen Peroxide and Colloidal Gold as Pseudo-Homogenous Catalyst: A Combined Experimental and Theoretical Investigation

Jitrayut Jitonnom [a] and Christoph Sontag *[a]
* Author for corresponding; e-mail address: c.sontag@web.de
Volume: Vol.43 No.4 (JULY 2016)
Research Article
DOI:
Received: 10 July 2013, Revised: -, Accepted: 25 April 2014, Published: -

Citation: Jitonnom J. and Sontag C., Catalytic Oxidation of Glucose with Hydrogen Peroxide and Colloidal Gold as Pseudo-Homogenous Catalyst: A Combined Experimental and Theoretical Investigation, Chiang Mai Journal of Science, 2016; 43(4): 825-833.

Abstract

Gold nanoparticles have been proved to act as oxidation catalyst for glucose oxidation, offering a “chemical” synthetic route to gluconic acid and gluconates - nowadays commercially produced by an enzyme catalyzed oxidation. Our investigations of the gold catalyzed oxidation route showed that gold nanoparticles produced by a modified Turkevich method have a high activity for this pseudo-homogenous catalytic reaction. Under mild reaction conditions, glucose could be oxidized in good yields (~70%) and the resulting gluconate could be isolated by column chromatography and precipitation as calcium salt. The catalytic oxidation reaction was found to follow the first-order kinetic with a rate constant of 4.95 h-1, in good agreement with previous finding. The underlying reaction mechanism is discussed, assuming that the formation of a gold-glucose cluster intermediate is a key catalytic step. Several structures of the gold-glucose intermediates were examined using density functional theory methods. The molecular behavior of glucose adsorption in gold colloid solution is present.

Keywords: colloidal gold catalyst, glucose oxidation, gold nanoparticle, gluconic acid, DFT

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