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食品研究与开发:2017,38(9):168-172
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一株纤维素高产菌株的鉴定及发酵条件优化
葛含静,杨苗苗
(陕西学前师范学院 生命科学与食品工程学院,陕西 西安 710100)
Identification and Fermentation Conditions Optimizing of A High-yield Bacterial Cellulose-producing Strain
GE Han-jing, YANG Miao-miao
(College of Life Science and Food Engineering, Shaanxi Xueqian Normal University, Xi'an 710100, Shaanxi, China)
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投稿时间:2016-08-08    
中文摘要: 从实验室自制醋中筛选出 1 株纤维素高产菌株 J2,经形态学特征及分子生物学鉴定,确定为汉森氏葡糖醋杆 菌(Gluconacetobacter hansenii, GenBank 登录号为 GU213109)。通过 PB(Plackett-Burman)和 BB(Box-Behnken)试验设 计优化菌株 J2 的发酵培养条件,结果表明,培养基中酵母膏和无水乙醇的含量对 BC(细菌纤维素,bacterial cellulose)产 量影响极显著,ZnSO4 的含量影响显著。通过多元二次方程方差分析及回归方程系数显著性检验,表明所建模型与实 际拟合良好,且发酵培养基优化后配方中酵母膏 3.3 g/L,ZnSO4 0.9 g/L,无水乙醇 0.7 %;使用优化后的发酵培养基,菌 株 J2 的 BC 产量增加到 10.41 g/100 mL,提高了 22.18 %。发酵动力学试验表明,菌株 J2 最佳发酵时间为 7 d,BC 产量可 达 12 g/100 mL。
中文关键词: 细菌纤维素  鉴定  发酵条件
Abstract:A high-yield bacterial cellulose (BC)-producing strain named J2 was isolated from lab homemade vinegar. It was identified as Gluconacetobacter hansenii (GenBank accession GU213109) by morphological characteristics and molecular biological identification. Additionally, the fermentation conditions of strain J2 were studied by PB and BB experiments. The results showed that the contents of yeast extract and anhydrous al- cohol had extremely significant influence on BC yield. Moreover, the data of regression equation of cultivation and regression coefficients and significance of the cultivation indicated that the established model agreed well with the practice, and the optimum fermentation medium contained yeast extract 3.3 g/L, ZnSO4 0.9 g/L and an- hydrous alcohol 0.7 %. Under the optimum fermentation conditions, BC yield could reach to 10.41 g/100 mL, which increased by 22.18 %. Finally, the results of fermenting kinetic experiment showed that the optimum fer- mentation time was 7 d, and BC yield was about 12 g/100 mL at this time.
文章编号:201709038     中图分类号:    文献标志码:A
基金项目:陕 西 省 科 技 厅 自 然 科 学 基 础 研 究 计 划 项 目 (2016JQ3036);陕西省教育厅产业化培育项目(2012JC03);陕西省 科技厅农业科技创新与攻关项目(2016NY-204);陕西省教育厅科学 研究项目(15JK1183)
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