固态发酵
纤维素酶
烟曲霉
发酵
玉米秸秆
羧甲基纤维素
乙醇燃料
食品科学
化学
水解
纤维素
生物
微生物学
生物化学
有机化学
钠
作者
Dongyang Liu,Ruifu Zhang,Xinlin Yang,Hong‐sheng Wu,Dawei Xu,Zhu Tang,Qirong Shen
标识
DOI:10.1016/j.ibiod.2011.04.005
摘要
A lignocellulosic decomposing fungus Z5 was isolated and identified as Aspergillus fumigatus, its capacity to produce cellulase was assessed under solid-state fermentation (SSF) using lignocellulosic materials as substrates. Cultivation conditions of A. fumigatus Z5 for cellulase production were optimized, results showed that for carboxymethyl cellulase (CMCase) and filter paper enzyme (FPase), the best condition was 50 °C, 80% initial moisture, initial pH 4.0 and 7% initial inoculum, the average activity of CMCase activity, FPase activity reached 526.3 and 144.6 U g−1 dry weight (dw) respectively, much higher than most of previous reports of this genus. Optimal temperature and pH for the CMCase activity of the crude enzyme were found to be 50 °C and 5.0, respectively. Zymogram analysis showed that eight kinds of CMCase were secreted by A. fumigatus Z5 when cellulose-containing materials were supplied in the culture. The crude enzyme secreted by the strain was further applied to hydrolyze pretreated corn stover and the enzymatic hydrolysate was used as substrate for ethanol production by Saccharomyces cerevisiae. The yield of bio-ethanol was 0.112 g g−1 dry substrate (gDS), suggesting that it is a promising fungus in the bio-ethanol production process.
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