Effect of the combined physical and chemical treatments with microbial fermentation on corn straw degradation.
In order to improve corn straw degradation, steam explosion, sodium hydroxide soaking and Aspergillus oryzae fermentation were used. The optimal sodium hydroxide pretreatment condition for lignin degradation was obtained. The degradation rates of hemicellulose, cellulose and lignin were 54.68%, 17.76% and 33.14% for the exploded straw (P<0.05); 67.92%, 2.44% (P>0.05) and 76.54% for the alkali-treated straw (P<0.05); 75.98%, 39.93% and 77.88% for the exploded and alkali-treated straw (P<0.05), respectively. The following microbial fermentation could degrade hemicellulose and cellulose further (P<0.05). Cellulase, amylase and protease activities produced during microbial fermentation in the pretreated corn straw were lower than that in the untreated one (P<0.05); however, glucose content was increased by microbial fermentation (P<0.05). It can be concluded that the combined treatments of steam explosion, sodium hydroxide and microbial fermentation will be a good method for straw degradation.
College of Animal Science and Veterinary Medicine, Henan Agricultural University, 95 Wenhua Road, Zhengzhou 450002, China.
Hongwei
H
Guo
Juan
J
Chang
Qingqiang
Q
Yin
Ping
P
Wang
Min
M
Lu
Xiao
X
Wang
Xiaowei
X
Dang
D001419:Bacteria / Q000378:metabolism*; D001709:Biotechnology / Q000379:methods*; D004798:Enzymes / Q000378:metabolism; D005285:Fermentation / Q000187:drug effects*; D005947:Glucose / Q000378:metabolism; D008031:Lignin / Q000378:metabolism; D012972:Sodium Hydroxide / Q000494:pharmacology*; D014866:Waste Products / Q000032:analysis*; D003313:Zea mays / Q000737:chemistry*
D004798:Enzymes; D014866:Waste Products; D012972:Sodium Hydroxide; D008031:Lignin; D005947:Glucose
Corn straw; Degradation; Microbial fermentation; Sodium hydroxide; Steam explosion