Photofermentative production of hydrogen from organic acids by the purple sulfur bacterium Thiocapsa roseopersicina |
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| Authors: | Andrea Nyilasi,É va Molnos,Szabolcs Lá nyi,Iosif Nagy,Gá bor Rá khely,Korné l Lajos Ková cs |
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| Affiliation: | 1. Department of Biotechnology, University of Szeged, Közép fasor 52, Szeged H-6726, Hungary;2. Faculty of Applied Chemistry and Material Science, Politehnica University of Bucharest, Str. Polizu 1-7, Bucure?ti RO-011061, Romania;3. Faculty of Technical and Social Sciences, Sapientia – Hungarian University of Transylvania, P-ta Libert?tii 1, Miercurea Ciuc RO-530104, Romania;4. Institute of Biophysics, Biological Research Center, Hungarian Academy of Sciences, Temesvári krt. 52, Szeged H-6726, Hungary |
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| Abstract: | A mutant strain of the anaerobic purple sulfur bacterium Thiocapsa roseopersicina, containing only nitrogenase as a functionally active enzyme for H2 generation was utilized to study the production of H2 from organic acids (acetate, pyruvate and succinate). Two types of potential substrates for H2 production, thiosulfate and salts of various organic acids, were compared under photoheterotrophic growth conditions. Thiosulfate proved to be the preferred electron donor for T. roseopersicina; the consumption of organic acids became pronounced only following depletion of the thiosulfate supply. The system is suitable for the generation of H2 from effluents of heterotrophic dark fermentation processes or waste streams rich in inorganic reduced sulfur compounds and/or simple organic acids. |
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| Keywords: | Biohydrogen Nitrogenase Organic acid Photofermentation Thiocapsa roseopersicina |
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