Poly-gamma-glutamic acid production by simultaneous saccharification and fermentation using corn straw and its fertilizer synergistic effect evaluation
文献类型： 外文期刊
第一作者： Ji, Gaosheng
作者： Ji, Gaosheng;Xu, Lishan;Lyu, Qingyang;Liu, Yang;Li, Xudong;Yan, Zhiying;Ji, Gaosheng;Gong, Xuefeng
作者机构：
关键词： Simultaneous saccharification and fermentation (SSF); Agricultural wastes; Biorefining process; Poly-gamma-glutamic acid (gamma-PGA); Fertilizer synergist
期刊名称：BIOPROCESS AND BIOSYSTEMS ENGINEERING （ 影响因子：3.21； 五年影响因子：2.97 ）
ISSN： 1615-7591
年卷期： 2021 年 44 卷 10 期
页码：
收录情况： SCI
摘要： Agricultural wastes rich in lignocellulosic biomass have been used in the production of poly-gamma-glutamic acid (gamma-PGA) through separate hydrolysis and fermentation (SHF), but this process is complicated and generates a lot of wastes. In order to find a simpler and greener way to produce gamma-PGA using agricultural wastes, this study attempted to establish simultaneous saccharification and fermentation (SSF) with citric acid-pretreated corn straw. The possibility of Bacillus amyloliquefaciens JX-6 using corn straw as substrate to synthesize gamma-PGA was validated, and the results showed that increasing the proportion of glucose in the substrate could improve the gamma-PGA yield. Based on these preliminary results, the corn straw was pretreated using citric acid. Then, the liquid fraction (xylan-rich) was used for cultivation of seed culture, and the solid fraction (glucan-rich) was used as the substrate for SSF. In a 10-L fermenter, the maximum cumulative gamma-PGA concentration in batch and fed-batch SSF were 5.08 +/- 0.78 g/L and 10.78 +/- 0.32 g/L, respectively. Moreover, the product from SSF without gamma-PGA extraction was used as a fertilizer synergist, increasing the yield of pepper by 13.46% (P < 0.05). Our study greatly simplified the production steps of gamma-PGA, and each step achieved zero emission as far as possible. The SSF process for gamma-PGA production provided a simple and green way for lignocellulose biorefinery and sustainable cultivation in agriculture [GRAPHICS] .
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