The bio-processing of soybean dregs by solid state fermentation using a poly gamma-glutamic acid producing strain and its effect as feed additive
文献类型： 外文期刊
作者： Jiang, Kang 1 ; Tang, Bao 3 ; Wang, Qian 1 ; Xu, Zongqi 1 ; Sun, Liang 1 ; Ma, Junjie 1 ; Li, Sha 1 ; Xu, Hong 1 ; Lei, Peng 1 ;
作者机构： 1.Nanjing Tech Univ, State Key Lab Mat Oriented Chem Engn, Nanjing 211816, Jiangsu, Peoples R China
2.Nanjing Tech Univ, Coll Food Sci & Light Ind, Nanjing 211816, Jiangsu, Peoples R China
3.Jiangsu Acad Agr Sci, Inst Plant Protect, Minist Sci & Technol, Jiangsu Key Lab Food Qual & Safety State Key Lab, Nanjing 210014, Jiangsu, Peoples R China
4.Nanjing Tech Univ, Jiangsu Natl Synerget Innovat Ctr Adv Mat, Nanjing, Jiangsu, Peoples R China
关键词： Soybean dregs; Solid state fermentation; Poly-gamma-glutamic acid; Bacillus amyloliquefaciens NX-2S; Anti-nutritional factors
期刊名称：BIORESOURCE TECHNOLOGY （ 影响因子：9.642； 五年影响因子：9.237 ）
ISSN： 0960-8524
年卷期： 2019 年 291 卷
页码：
收录情况： SCI
摘要： Soybean dregs are restricted as feed additives because they contain anti-nutrient factors. Herein, soybean dreg was bio-transformed by solid-state fermentation (SSF) using a poly gamma-glutamic acid (gamma-PGA) producing stain Bacillus amyloliquefaciens NX-2S. The maximum gamma-PGA production of 65.79 g/kg was reached in a 5 L fermentation system while the conditions are 70% initial moisture of soybean dregs with addition of molasses meal, 12% inoculum size, 30 degrees C fermentation temperature, initial pH of 8, and 60 h fermentation time. Meanwhile, continuous batch fermentation was proved feasible. After SSF, the anti-nutritional factors such as trypsin inhibitor, phytic acid and tannin were reduced by 98.7%, 97.8%, and 63.2%, respectively. Compared with unfermented soybean dregs, adding fermented soybean dregs to feed increased the average weight gain of rats by 15.6% and reduced the ratio of feed to meat by 11.3%. Therefore, this study provided a feasible strategy for processing soybean dregs as feed additive.
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