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首页> 外文期刊>Microorganisms >Biotransformation of Carboxylic Acids to Alcohols: Characterization of Thermoanaerobacter Strain AK152 and 1-Propanol Production via Propionate Reduction
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Biotransformation of Carboxylic Acids to Alcohols: Characterization of Thermoanaerobacter Strain AK152 and 1-Propanol Production via Propionate Reduction

机译：羧酸对醇的生物转化：通过丙酸盐还原表征Thermoana的菌株Ak152和1-丙醇的产生

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Thermoanaerobacter strains have recently gained interest because of their ability to convert short chain fatty acids to alcohols using actively growing cells. Thermoanaerobacter thermohydrosulfuricus strain AK152 was physiologically investigated for its ethanol and other alcohol formation. The temperature and pH optimum of the strain was 70 °C and pH 7.0 and the strain degraded a variety of compounds present in lignocellulosic biomass like monosaccharides, disaccharides, and starch. The strain is highly ethanologenic, producing up to 86% of the theoretical ethanol yield form hexoses. Strain AK152 was inhibited by relatively low initial substrate (30 mM) concentration, leading to inefficient degradation of glucose and levelling up of all end-product formation. The present study shows that the strain produces alcohols from most of the tested carboxylic acids, with the highest yields for propionate conversion to propanol (40.7%) with kinetic studies demonstrating that the maximum conversion happens within the first 48 h of fermentation. Various physiological tests were performed to maximize the acid conversion to the alcohol which reveals that the optimum pH for propionate conversion is pH 6.7 which affords a 57.3% conversion. Kinetic studies reveal that propionate conversion is rapid, achieving a maximum conversion within the first 48 h of fermentation. Finally, by using 13 C NMR, it was shown that the addition of propionate indeed converted to propanol.
机译：热腺细菌菌株最近获得了利益，因为它们使用主动生长细胞将短链脂肪酸转化为醇的含量。 ThermoanaErobacter ThermoOrosulfuricus菌株Ak152在生理学上研究其乙醇和其他醇形成。菌株的温度和pH最佳最佳最佳值为70℃，pH 7.0，应变降解了木质纤维素生物质中存在的各种化合物，如单糖，二糖和淀粉。该菌株是高度素质的，产生高达86％的理论乙醇产率为己糖。菌株Ak152通过相对低的初始基板（30mm）浓度抑制，导致葡萄糖的效率低下，并降低了所有最终产物的形成。本研究表明，该菌株从大多数测试的羧酸产生醇，具有最高的产酮转化为丙醇（40.7％）的产量，其表明在发酵的前48小时内发生最大转化。进行各种生理试验以使酸转化为醇的酸转化，显示丙酸盐转化率的最佳pH值为pH6.7，其转化为57.3％。动力学研究表明，丙酸酯转化迅速，在发酵的前48小时内实现最大转化。最后，通过使用13 C NMR，表明添加丙酸盐确实转化为丙醇。

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