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Hyper-production of butyric acid from delignified rice straw by a novel consolidated bioprocess
Bioresource Technology ( IF 11.4 ) Pub Date : 2018-01-09 , DOI: 10.1016/j.biortech.2018.01.042
Xue Chi , Jianzheng Li , Xin Wang , Yafei Zhang , Philip Antwi

A novel consolidated bioprocess for hyper-production of butyric acid from delignified rice straw without exogenous enzymes involved was developed by co-fermentation of Clostridium thermocellum ATCC 27405 and C. thermobutyricum ATCC 49875. Feasibility of the consolidated bioprocess was approved by batch fermentations, with the optimum pH of 6.5. Fed-batch fermentation with a constant pH of 6.5 at 55 °C could enhance the butyric acid yield to a remarkable 33.9 g/L with a selectivity as high as 78%. Metabolic analysis of the co-culture indicated that sugars liberated by C. thermocellum ATCC 27405 were effectively converted to butyric acid by C. thermobutyricum ATCC 49875. Secondary metabolism of C. thermobutyricum ATCC 49875 also contributed to the hyper-production of butyric acid, resulting in the re-assimilation of by-products such as acetic acid and ethanol. This work provides a more effective fermentation process for butyric acid production from lignocellulosic biomass for future applications.



中文翻译:

通过新型整合生物工艺从脱木素的稻草中超量生产丁酸

通过发酵梭菌ATCC 27405和丁酸梭菌ATCC 49875的共同发酵,开发了一种新的整合生物工艺,该工艺可以从脱木素的稻草中超量生产丁酸,而无需涉及外源酶最适pH值为6.5。在55°C下,恒定pH值为6.5的分批补料发酵可以将丁酸的产量提高至33.9 g / L,选择性高达78%。共培养的代谢分析表明,糖释放由热纤梭菌ATCC 27405通过被有效地转化为丁酸C. thermobutyricum ATCC的49875.次级代谢C. thermobutyricumATCC 49875还促进了丁酸的超量生产,导致副产物(如乙酸和乙醇)的重新同化。这项工作为木质纤维素生物质生产丁酸提供了更有效的发酵工艺,以备将来应用。

更新日期:2018-01-09
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