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  • Title: [Enhanced role of the co-culture of thermophilic anaerobic bacteria on cellulosic ethanol].
    Author: Fang ZG.
    Journal: Huan Jing Ke Xue; 2010 Apr; 31(4):1059-65. PubMed ID: 20527192.
    Abstract:
    Fermentation of the type of cellulosic materials to ethanol was evaluated in batch system of mono-cultures of cellulolytic ethanol producing strains (Clostridium thermocellum strain LQRI), and co-cultures of LQRI in combination with one of the non-cellulolytic ethanol producing strains (Thermoanaerobacter pseudoethanolicus strains X514 or Thermoanaerobacter ethanolicus 39E). Results showed that ethanol yields and cellulose degradation abilities were significantly improved by the establishment of co-cultures consisting of LQRI and Thermoanaerobacter ethanolicus partner. A factorial experimental comparison revealed that the co-culture of LQRI + X514 provided the higher ethanol yield than the co-culture of LQRI + 39E, but no significant difference on cellulose degradation by LQRI was found in these co-cultures. In the absence of yeast extract, the highest ethanol concentrations in the co-cultures of LQRI + X514 and LQRI + 39E were about 71 mmol/L and 36.5 mmol/L, which were approximately 5-11 and 3-5 times higher than that of the mono-culture LQRI under the same concentration substrate, respectively. In the presence of 0.6% yeast extract, the highest ethanol concentrations in the co-cultures of LQRI + X514 and LQRI + 39E were rapidly improved and reached 263.5 mmol/L and 143.5 mmol/L, which were approximately 8-22 and 8-12 times higher than that of the mono-culture LQRI under the same concentrations substrate, respectively. The maximum ethanol concentration reached about 263.5 mmol/L (1.2%) in the co-culture of LQRI + X514 grown on 5% Solka Floc in the presence of 0.6% yeast extract, while the maximum ethanol concentration reached 143.5 mmol/L (1.2%) in the co-culture of LQRI + 39E grown on 2% Solka Floc in the presence of 0.6% yeast extract.
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