枝孢菌AY-42产纤维素酶液态发酵优化Study on Optimization of Liquid Fermentation for Production of Cellulase by Cladosporium AY-42
衡文,李豪,马一凡,白光剑,邹伟
摘要(Abstract):
为提高枝孢菌AY-42纤维素酶的产量,通过单因素、响应面法优化其培养基成分及产酶条件。采用单因素试验确定了最适碳氮源分别为油菜秸秆粉和酵母粉。采用Plackett-Burman(PB)试验筛选出3个最显著的影响因素:MgSO_4·7H_2O、油菜秸秆粉、KH_2PO_4。进一步采用响应面优化后得到培养基组成:油菜秸秆粉12.5g/L,酵母粉2g/L,MgSO_4·7H_2O 0.75g/L,NaCl 0.5g/L,KH_2PO_45g/L,FeSO_4·7H_2O 0.01g/L。采用优化后的培养基优化培养条件,结果表明:最佳培养时间为3d,最佳接种量为5%,最适装液量为70mL,最适转速为200r/min,最佳培养温度为28℃。优化后CMC酶活提高到(4.20±0.06)IU,相比优化前酶活3.23IU提高了30.03%,产酶能力得到较大提升。该研究为枝孢菌应用于纤维素酶生产提供了一定理论支持。
关键词(KeyWords): 枝孢菌;纤维素酶;液态发酵;响应面法;优化
基金项目(Foundation): 自贡市科技局创新苗子工程项目(2018CXMZ02);; 四川省科技厅项目(2015JY0261);; 自贡市重点科技计划项目(2019YYJC27)
作者(Author): 衡文,李豪,马一凡,白光剑,邹伟
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