Influence of substrate on electricity generation of Shewanella loihica PV-4 in microbial fuel cells

Microbial Cell Factories

Research

Linling Bai¹  Xing Liu¹  Wenguo Wu²  Fei Yang³ 

[1] Biological science and medical engineering department, State Key Laboratory of Bioelectronics, Southeast University, 210096, Nanjing, P. R., China;College of Chemical Engineering, Huaqiao University, 361021, Xiamen, P. R., China;Biological science and medical engineering department, State Key Laboratory of Bioelectronics, Southeast University, 210096, Nanjing, P. R., China;Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, 210096, Nanjing, P. R., China;

关键词: Galactose;    Cyclodextrin;    Arabinose;    Microbial Fuel Cell;    Shewanella;   

DOI  :  10.1186/1475-2859-13-69

 received in 2013-11-23, accepted in 2014-05-07,  发布年份 2014

来源: Springer

【 摘 要 】

BackgroundThe substrate, serving as carbon and energy source, is one of the major factors affecting the performance of microbial fuel cells (MFCs). We utilized BIOLOG system to rapidly screen substrates for electricigens, and further evaluated influence of these substrates on electricity generation of Shewanella loihica PV-4 in MFCs.ResultsThree of most favorable substrates (lactate acid, formic acid and cyclodextrin) with OD590/750 of 0.952, 0.880 and 0.849 as well as three of most unfavorable substrates (galactose, arabinose and glucose) with OD590/750 of 0.248, 0.137 and 0.119 were selected by BIOLOG system under aerobic conditions. The chronoamperometry results showed that MFCs fed with these substrates exhibited different current behaviors. Cyclic voltammograms results showed that arabinose, galactose and glucose promoted electron transfer from outer membrane c-Cyts of cells to the electrode surface. Lactic acid, formic acid and cyclodextrin produced lower quantity of electric charge of 10.13 C, 9.83 C and 10.10 C, the corresponding OD600 value was 0.180, 0.286 and 0.152 in BES; while galactose, arabinose and glucose generated higher quantity of electric charge of 12.34 C, 13.42 C and 17.45 C, and increased OD600 values were 0.338, 0.558 and 0.409 in BES. SEMs results showed that plenty of plump and stretched cells as well as appendages were observed when lactic acid, formic acid, and cyclodextrin were utilized as substrates, while sparse cells in short shape were obtained when galactose, arabinose and glucose were used as substrates.ConclusionsThese results suggest that substrate not only has important role in electrochemical performances of MFCs but also in biological properties of electricigens. Lactic acid, formic acid, and cyclodextrin beneficial for cell growth under aerobic conditions are unfavourable for planktonic cell growth and current generation under anaerobic conditions, while consumptions of galactose, arabinose and glucose adverse to cell growth under aerobic conditions are favourable for planktonic cell growth and current generation under anaerobic conditions due to the increase of cell numbers with more outer membrane c-Cyts transferring electrons between the electrode surface and cells.

【 授权许可】

CC BY   
© Wu et al.; licensee BioMed Central Ltd. 2014