The unconventional adverse effects of fungal pretreatment on iturin A fermentation byBacillus amyloliquefaciensCX-20

文献类型： 外文期刊

第一作者： Chen, Wenchao

作者： Chen, Wenchao;Wang, Meng;Gong, Yangmin;Deng, Qianchun;Zheng, Mingming;Wan, Xia;Yang, Chen;Huang, Fenghong;Chen, Wenchao;Gong, Yangmin;Deng, Qianchun;Zheng, Mingming;Wan, Xia;Yang, Chen;Huang, Fenghong;Chen, Wenchao;Gong, Yangmin;Deng, Qianchun;Zheng, Mingming;Wan, Xia;Yang, Chen;Huang, Fenghong;Chen, Wenchao;Gong, Yangmin;Deng, Qianchun;Zheng, Mingming;Wan, Xia;Yang, Chen;Huang, Fenghong;Chen, Shouwen

作者机构：

期刊名称：MICROBIAL BIOTECHNOLOGY （ 影响因子：5.813； 五年影响因子：6.559 ）

ISSN： 1751-7915

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收录情况： SCI

摘要： Fungal pretreatment is the most common strategy for improving the conversion of rapeseed meal (RSM) into value-added microbial products. It was demonstrated thatBacillus amyloliquefaciensCX-20 could directly use RSM as the sole source of all nutrients except the carbon source for iturin A fermentation with high productivity. However, whether fungal pretreatment has an impact on iturin A production is still unknown. In this study, the effects of fungal pretreatment and direct bio-utilization of RSM for iturin A fermentation were comparatively analysed through screening suitable fungal species, and evaluating the relationships between iturin A production and the composition of solid fermented RSM and liquid hydrolysates. Three main unconventional adverse effects were identified. (1) Solid-state fermentation by fungi resulted in a decrease of the total nitrogen forB. amyloliquefaciensCX-20 growth and metabolism, which caused nitrogen waste from RSM. (2) The released free ammonium nitrogen in liquid hydrolysates by fungal pretreatment led to the reduction of iturin A. (3) The insoluble precipitates of hydrolysates, which were mostly ignored and wasted in previous studies, were found to have beneficial effects on producing iturin A. In conclusion, our study verifies the unconventional adverse effects of fungal pretreatment on iturin A production byB. amyloliquefaciensCX-20 compared with direct bio-utilization of RSM.

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