Journal
BIORESOURCE TECHNOLOGY
Volume 167, Issue -, Pages 490-494Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2014.05.093
Keywords
Microbial fuel cell (MFC); Sophorolipid; Pyocyanin; Pseudomonas aeruginosa; Permeability
Funding
- National Basic Research Program of China (973 Program) [2013CB733904, 2013CB733502]
- National High-tech R&D Program of China (863 Program) [2012AA022106]
- National Natural Science Foundation of China (NSFC) [21206073, 21306069]
- Specialized Research Fund for the Doctoral Program of Higher Education (Ministry of Education) [20133227120014]
- Natural Science Foundation of Jiangsu Province [BK20130932, BK20130492]
- Natural Science Foundation of the Jiangsu Higher Education Institutions of China [13KJB530009]
- 'Six Talent Peaks' program (Jiangsu Province, China) [2012-NY-029]
- Start-up grant from Jiangsu University - Priority Academic Program Development of Jiangsu Higher Education Institutions [12JDG072]
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Improvement on electron shuttle-mediated extracellular electron transfer (EET) is of great potential to enhance the power output of MFCs. In this study, sophorolipid was added to enhance the performance of Pseudomonas aeruginosa-inoculated MFC by improving the electron shuttle-mediated EET. Upon sophorolipid addition, the current density and power density increased similar to 1.7 times and similar to 2.6 times, respectively. In accordance, significant enhancement on pyocyanin production (the electron shuttle) and membrane permeability were observed. Furthermore, the conditions for sophorolipid addition were optimized to achieve maximum pyocyanin production (14.47 +/- 0.23 mu g/mL), and 4 times higher power output was obtained compared to the control. The results substantiated that enhanced membrane permeability and pyocyanin production by sophorolipid, which promoted the electron shuttle-mediated EET, underlies the improvement of the energy output in the P. aeruginosa-inoculated MFC. It suggested that addition of biosurfactant could be a promising way to enhance the energy generation in MFCs. (C) 2014 Elsevier Ltd. All rights reserved.
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