Reprint of 鈥淪ynergetic combination of an enzyme and gold catalysts for glucose oxidation in neutral aqueous solution鈥?/span>

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• 作者：Ayako Taketoshi^a ; ^b ; Sho Takenouchi^a ; ^b ; Takashi Takei^a ; ^b ; Masatake Haruta^a ; ^b ; ^{haruta-masatake@tmu.ac.jp" class="auth_mail}
• 关键词：Gold nanoparticles ; Glucose oxidase ; Glucose ; Aerobic oxidation ; Gluconic acid
• 刊名：Applied Catalysis A: General
• 出版年：22 March, 2014
• 年：2014
• 卷：474
• 期：Complete
• 页码：257-262
• 全文大小：1146 K

文摘

Glucose oxidation by enzyme takes place in neutral aqueous solution at room temperature, producing gluconic acid in equilibrium with gluconate, while gold catalysts exhibit much higher catalytic activity but in alkali solution to produce sodium gluconate. The combination of glucose oxidase with selected gold catalysts such as Au/ZrO₂ and Au/NanoDiamond led to improved catalytic performance in neutral solution at room temperature. Gold nanoparticles supported on ZrO₂ decomposed hydrogen peroxide (H₂O₂) formed by the oxidation of glucose and depressed the damage of glucose oxidase by H₂O₂. In addition, Au/ZrO₂ utilized H₂O₂ produced by the enzyme to oxidize glucose to gluconic acid. In contrast, gold nanoparticles supported on NanoDiamond were active only for the decomposition of H₂O₂, while the presence of NanoDiamond itself could encourage glucose oxidase for the selective oxidation.