Xing Defeng, Zuo Yi, Cheng Shaoan, Regan John M, Logan Bruce E
Engineering Environmental Institute, 212 Sackett Building, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.
Environ Sci Technol. 2008 Jun 1;42(11):4146-51. doi: 10.1021/es800312v.
Bacteria able to generate electricity in microbial fuel cells (MFCs) are of great interest, but there are few strains capable of high power production in these systems. Here we report that the phototrophic purple nonsulfur bacterium Rhodopseudomonas palustris DX-1, isolated from an MFC, produced electricity at higher power densities (2720 +/- 60 mW/m2) than mixed cultures in the same device. While Rhodopseudomonas species are known for their ability to generate hydrogen, they have not previously been shown to generate power in an MFC, and current was generated without the need for light or hydrogen production. Strain DX-1 utilizes a wide variety of substrates (volatile acids, yeast extract, and thiosulfate) for power production in different metabolic modes, making it highly useful for studying power generation in MFCs and generating power from a range of simple and complex sources of organic matter. These results demonstrate that a phototrophic purple nonsulfur bacterium can efficiently generate electricity by direct electron transfer in MFCs, providing another model microorganism for MFC investigations.
能够在微生物燃料电池（MFC）中发电的细菌备受关注，但在这些系统中能够进行高功率发电的菌株却很少。在此，我们报告从一个MFC中分离出的光合紫色非硫细菌沼泽红假单胞菌DX-1，在同一装置中产生电能的功率密度（2720±60 mW/m2）高于混合培养物。虽然红假单胞菌属以其产生氢气的能力而闻名，但此前尚未证明它们能在MFC中发电，而且发电过程无需光照或产氢。菌株DX-1在不同代谢模式下利用多种底物（挥发性酸、酵母提取物和硫代硫酸盐）进行发电，这使其在研究MFC中的发电以及利用一系列简单和复杂的有机物质来源发电方面非常有用。这些结果表明，光合紫色非硫细菌可以通过MFC中的直接电子转移有效地发电，为MFC研究提供了另一种模式微生物。
