Effect of pH and Buffer on Butyric Acid Production and Microbial Community Characteristics in Bioconversion of Rice Straw with Undefined Mixed Culture

文献类型： 外文期刊

第一作者： Ai, Binling

作者： Ai, Binling;Li, Jianzheng;Chi, Xue;Meng, Jia;Jha, Ajay Kumar;Liu, Chong;Shi, En;Ai, Binling

作者机构：

关键词： butyric acid production;rice straw;pH;pH buffer;undefined mixed culture

期刊名称：BIOTECHNOLOGY AND BIOPROCESS ENGINEERING （ 影响因子：2.836； 五年影响因子：2.281 ）

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收录情况： SCI

摘要： This study was conducted to identify the optimum pH range and the appropriate buffer for butyric acid production from rice straw by fermentation using an undefined mixed culture. A series of experiments conducted at pH levels of 5.0 ～ 7.0 showed that neutral pH improved rice straw conversion and consequently carboxylic acid production. The highest butyric acid production (up to 6.7 g/L) was achieved at pH of 6.0 ～ 6.5, while it was only 1.7 g/L without pH control or at pH 5.0. Another series of experiments conducted at pH 6.0 ～ 6.5 buffered with CaCO_3, NaHCO_3, NH_4HCO_3 and their combinations indicated that different buffers had different effects onthe product spectrum, and that CaCO_3 combined with NaHCO_3 was an effective buffer for butyric acid production. The highest total volatile fatty acids (about 12.6 g/L) production and one of the two highest butyric acid concentrations (about 7.6 g/L) were obtained by buffering with CaCO_3 combined with NaHCO_3. PCR-DGGE analysis revealed that different pH and buffers also influenced the microbial population distribution. Bacteria were suppressed at low pH , while the bacterial community structures at higher pH varied slightly. Overall, this study presents an alternative method for butyric acid production from lignocellulosic biomass without supplementary cellulolytic enzyme.

分类号： Q

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