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投稿时间:2023-03-14
投稿时间:2023-03-14
中文摘要: 为提高在白酒酿造过程中阿魏酸(ferulic acid,FA)的含量,该研究从浓香型白酒大曲中筛选到一株耐高温产阿魏酸酯酶(ferulic acid esterase,FAE)的菌株,经过形态学、生理生化特征和分子生物学鉴定为假单胞菌(Pseudomonas)。通过对pH 值、温度、碳源、氮源、诱导物5 个发酵条件进行单因素试验和对3 个主要影响因子进行响应面试验设计,对该菌株进行液态发酵培养基优化,结果表明该菌株产阿魏酸酯酶优化培养基配方为葡萄糖浓度30 g/L、酵母提取物添加量60 g/L、粉碎的麦麸添加量30 g/L、KCl 0.05 g/L、MgSO4·7H2O 0.05 g/L、K2HPO4 0.10 g/L,pH6.0。在此优化培养基条件下该菌株摇瓶发酵的最大酶活力可达73.5 U/L,与优化前得到的酶活力25.5 U/L 相比,提升约3 倍。
Abstract:A strain with strong ferulic acid esterase(FAE)activity and thermostability was screened out from the Luzhou-flavor liquor Daqu to increase the content of ferulic acid(FA)in the brewing process of liquor. It was identified as Pseudomonas based on morphological,physiological,and biochemical characteristics and molecular sequence. Five fermentation conditions including pH,temperature,carbon source,nitrogen source,and inducer were examined by single factor tests and the top three influencing factors of the liquid fermentation were optimized by response surface design. The results showed that the optimized medium formula for FAE production of the strain was as follows:glucose 30 g/L,yeast extract 60 g/L,crushed wheat bran 30 g/L,KCl 0.05 g/L,MgSO4·7H2O 0.05 g/L,K2HPO4 0.10 g/L,and pH6.0.In the optimized medium,the maximum FAE activity of the strain reached 73.5 U/L in shake flask fermentation,which was about 3 times of that(25.5 U/L)before optimization.
keywords: ferulic acid esterase Luzhou-flavor liquor Pseudomonas single factor test response surface design
文章编号:202413026 中图分类号: 文献标志码:
基金项目:四川省科技厅计划重点研发项目(2022YFS0549);四川省2022 年度博士后科研项目(294074);四川轻化工大学研究生创新基金资助项目(Y2022085);四川轻化工大学大学生创新创业训练计划项目(cx2021143);四川轻化大学人才引进项目(2019RC31)
作者 | 单位 |
童文华1,2,3,李依芸1,黄志久1,4,杜萍1,黄丹1,2,罗惠波1,2,乔宗伟3 | 1.四川轻化工大学生物工程学院,四川自贡 643000;2.酿酒生物技术及应用四川省重点实验室,四川宜宾 644000;3.宜宾五粮液股份有限公司,四川宜宾 644000;4.醉清风酒业股份有限公司,四川泸州 646000 |
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