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Performance evaluation of glucose oxidation reaction using biocatalysts adopting different quinone derivatives and their utilization in enzymatic biofuel cells

机译:使用不同醌衍生物的生物催化剂进行葡萄糖氧化反应的性能评估及其在酶促生物燃料电池中的利用

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摘要

Glucose oxidase (GOx) and four different quinone derivatives (p-benzoquinone (BQ), naphthoquinone (NQ), anthraquinone (AQ) and 1,5-Dihydroxyanthraquinone (15DHAQ)) based biocomposites were embedded in polyethyleneimine (PEI) and then immobilized on carbon nanotube (CNT) substrate (CNT/PEI/Quinone/GOx). These catalysts were then used as the anodic biocatalysts for the enzymatic biofuel cell (EBC). According to the performance investigations of catalysts, the catalytic activity for glucose oxidation reaction (GOR) representing the electron transfer rate between GOx and glucose fuel is mostly enhanced in CNT/PEI/NQ/GOx. It is because two benzene rings of NQ play a role in attracting and releasing electrons effectively, increasing the catalytic activity for GOR, while other quinones have problems about attracting electrons (AQ and 15DHAQ) and wrong position of the reactive site for electron transfer (BQ). Excellent electron transfer rate constant (1.1 s(-1)) and Michaelis-Menten constant (0.99mM) are outstanding evidence for that. Furthermore, when the catalyst is utilized for EBC, high power density (57.4 Wcm(-2)) and high open circuit voltage (0.64 V) are accomplished.
机译:葡萄糖氧化酶(GOx)和四种不同的醌衍生物(对苯醌(BQ),萘醌(NQ),蒽醌(AQ)和1,5-二羟基蒽醌(15DHAQ))的生物复合材料嵌入聚乙烯亚胺(PEI)中,然后固定在碳纳米管(CNT)基板(CNT / PEI / Quinone / GOx)。然后将这些催化剂用作酶促生物燃料电池(EBC)的阳极生物催化剂。根据催化剂的性能研究,在CNT / PEI / NQ / GOx中,代表GOx和葡萄糖燃料之间电子转移速率的葡萄糖氧化反应(GOR)的催化活性大大提高。这是因为NQ的两个苯环有效地吸引和释放电子,从而增加了对GOR的催化活性,而其他醌存在吸引电子(AQ和15DHAQ)以及电子转移反应位错位置(BQ)的问题。 )。出色的电子传输速率常数(1.1 s(-1))和迈克尔斯-门腾常数(0.99mM)是这一点的出色证据。此外,当将催化剂用于EBC时,可实现高功率密度(57.4 Wcm(-2))和高开路电压(0.64 V)。

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