Enzyme recycle and fed-batch addition for high-productivity soybean flour processing to produce enriched soy protein and concentrated hydrolysate of fermentable sugars

被引:15
作者
Al Loman, Abdullah [1 ]
Islam, S. M. Mahfuzul [1 ]
Li, Qian [1 ]
Ju, Lu-Kwang [1 ]
机构
[1] Univ Akron, Dept Chem & Biomol Engn, Akron, OH 44325 USA
关键词
Fed batch; Recycle; Soy flour; Fermentation feedstock; Soy protein; Bio-refinery; SOLID-STATE FERMENTATION; PRETREATED CORN STOVER; ACID PRODUCTION; ETHANOL; CELLULASE; MOLASSES; HULL; SACCHARIFICATION; OPTIMIZATION; FEEDSTOCK;
D O I
10.1016/j.biortech.2017.05.118
中图分类号
S2 [农业工程];
学科分类号
0828 ;
摘要
Despite having high protein and carbohydrate, soybean flour utilization is limited to partial replacement of animal feed to date. Enzymatic process can be exploited to increase its value by enriching protein content and separating carbohydrate for utilization as fermentation feedstock. Enzyme hydrolysis with fed-batch and recycle designs were evaluated here for achieving this goal with high productivities. Fed-batch process improved carbohydrate conversion, particularly at high substrate loadings of 250-375 g/L. In recycle process, hydrolysate retained a significant portion of the limiting enzyme alpha-galactosidase to accelerate carbohydrate monomerization rate. At single-pass retention time of 6 h and recycle rate of 62.5%, reducing sugar concentration reached up to 120 g/L using 4 ml/g enzyme. When compared with batch and fed-batch processes, the recycle process increased the volumetric productivity of reducing sugar by 36% (vs. fed-batch) to 57% (vs. batch) and that of protein product by 280% (vs. fed-batch) to 300% (vs. batch). (C) 2017 Elsevier Ltd. All rights reserved.
引用
收藏
页码:252 / 261
页数:10
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