期刊
BIOSENSORS & BIOELECTRONICS
卷 20, 期 10, 页码 2145-2150出版社
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2004.08.017
关键词
enzyme fuel cell; PQQ glucose dehydrogenase; protein engineering; bilirubin oxidase; stability
Glucose dehydrogenase harboring pyrroloquinoline quinone as the prosthetic group (PQQGDH) from Acinetobacter calcoaceticus is an ideal enzyme for the anode of biofuel cell, because of its oxygen insensitivity and high catalytic efficiency. However, the application of PQQGDH for the bioanode is inherently limited because of its instability. Using Ser415Cys mutant whose stability was greatly improved, we constructed the biofuel cell system employing the engineered PQQGDH as the bioanode enzyme and bilirubin oxidase (BOD) as the biocathode, and compared the stability of the biofuel cell with that employing wild-type PQQGDH. The maximum power density was 17.6 mu W/cm(2) at an external optimal load of 200 k Omega. Using Ser415Cys mutant, the lifetime of the biofuel cell system was greatly extended to 152 h, more than six times as that of the biofuel cell employing the wild-type. (c) 2004 Elsevier B.V. All rights reserved.
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