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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

作者： Ji, Gaosheng 1 ; Xu, Lishan 1 ; Lyu, Qingyang 1 ; Liu, Yang 1 ; Gong, Xuefeng 3 ; Li, Xudong 1 ; Yan, Zhiying 1 ;

作者机构： 1.Chinese Acad Sci, CAS Key Lab Environm & Appl Microbiol, Environm Microbiol Key Lab Sichuan Prov, Chengdu Inst Biol, Chengdu 610041, Peoples R China

2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

3.Sichuan Acad Agr Sci, Inst Hort, Chengdu 610066, Peoples R China

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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