Solid-state fermentation of soybean and corn processing coproducts for potential feed improvement

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[1] Lio, Junyi
[2] Wang, Tong
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Wang, T. (tongwang@iastate.edu) | 1600年 / American Chemical Society卷 / 60期
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Two agro-industrial coproducts; soybean cotyledon fiber and distiller's dried grains with solubles (DDGS); were used as substrates to evaluate the effect of coculturing three different fungi; Aspergillus oryzae; Trichoderma reesei; and Phanerochaete chrysosporium; on enzyme production by solid-state fermentation (SSF). When soybean fiber was used as the substrate; a maximum xylanase activity of 757.4 IU/g and a cellulase activity of 3.2 IU/g were achieved with the inoculation and incubation of T. reesei and P. chrysosporium for 36 h; followed by A. oryzae for an additional 108 h. This inoculation scheme also resulted in the highest xylanase activity of 399.2 IU/g compared to other fungi combinations in the SSF of DDGS. A large-scale SSF by this fungus combination produced fermented products that had xylanase and cellulase activities of 35.9-57.0 and 0.4-1.2 IU/g; respectively. These products also had 3.5-15.1% lower fiber and 1.3-4.2% higher protein contents; suggesting a potential feed quality improvement. © 2012 American Chemical Society;
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