Characterization of Electrochemical Activity of Butyrate-Producing Clostridium sp.

Characterization of Electrochemical Activity of Butyrate-Producing Clostridium sp.
Issue Date
한국화학공학회 2011년 가을 총회 및 학술대회
A lack of outer membrane proteins in Gram-positive bacteria suggests that electron transfers to electrode are impossible without soluble electron-carrying mediator. Although one of spore-forming Clostridium butyricum strain has been reported to be electrically active without the addition of a soluble mediator (Park et al, 2001), the mechanism of electron transfer between electrode and Gram-positive spore formers remains unexplained. Here, we show that the direct electron transfer from a butyrate-producing Clostridium sp. to a cathode. Without mediators, the current was consumed by the Clostridium sp. at a cathode compartment of H-type bioelectrochemical reactor (BER) in which an anode oxidizes ferrous to ferric ion. Other tested strains, C. acetobutylicum and C. tyrobutyricum did not show current consumption without mediators. Increased reducing powers induced by electron supply to the Clostridium sp. enhanced butyrate production up to 2 times. Also, biofilm formation was electrochemically driven on the surface of cathode, graphite felt. The study of electrochemical activity of the Clostridium sp. can help to understand interaction between Gram-positive spore former and electrode and to apply electricity for an electron donor to microbes.
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