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食品与发酵工业  2020, Vol. 46 Issue (13): 24-29    DOI: 10.13995/j.cnki.11-1802/ts.023292
  研究报告 本期目录 | 过刊浏览 | 高级检索 |
氨氮对淀粉酶产色链霉菌产ε-聚赖氨酸的影响
魏希庆1, 郭凤柱1, 胡春磊1, 宋富1, 赵卓1, 谭之磊1,2,3*, 贾士儒1,2,3*
1(天津科技大学 生物工程学院,工业发酵微生物教育部重点实验室,天津,300457)
2(省部共建食品营养与安全国家重点实验室(天津科技大学),天津,300457)
3(天津市微生物代谢与发酵过程控制技术工程中心,天津,300457)
Effect of ammonia nitrogen on the production of ε-poly-L-lysinein Streptomyces diastatochromogenes
WEI Xiqing1, GUO Fengzhu1, HU Chunlei1, SONG Fu1, ZHAO Zhuo1, TAN Zhilei1,2,3*, JIA Shiru1,2,3*
1(Key Laboratory of Industrial Fermentation Microbiology Ministry of Education, College of Bioengineering,Tianjin University of Science & Technology, Tianjin 300457, China)
2(State Key Laboratory of Food Nutrition and Safety, Tianjin University of Science & Technology, Tianjin 300457, China)
3(Tianjin Engineering Research Center of Microbial Metabolism and Fermentation Process Control, Tianjin 300457, China)
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摘要 ε-聚赖氨酸(ε-poly-L-lysine,ε-PL)是一种新型广谱天然防腐剂。由于生产成本较高,价格昂贵,限制了其在食品工业上的广泛应用。为降低生产成本,研究了不同氨氮(NH+4-N)浓度对淀粉酶产色链霉菌生产ε-聚赖氨酸的影响。摇瓶发酵试验结果表明,当NH+4-N初始质量浓度为0.5 g/L时,提高了天冬氨酸激酶(aspartokinase,Ask)和聚赖氨酸合成酶(polylysine synthetase,Pls)的活力,发酵96 h, ε-PL产量达到0.95 g/L,与对照组相比提高了15.13%。5 L发酵罐分批发酵和流加发酵实验确定了一种有效提高ε-PL产量的方法:初始NH+4-N质量浓度2.5 g/L,发酵过程中流加(NH4)2SO4使NH+4-N质量浓度维持在0.5 g/L。采用此工艺进行补料分批发酵,ε-PL最高产量达到27.67 g/L,与对照组相比提高了17.72%。
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魏希庆
郭凤柱
胡春磊
宋富
赵卓
谭之磊
贾士儒
关键词:  淀粉酶产色链霉菌  氨氮  ε-聚赖氨酸  流加发酵    
Abstract: ε-poly-L-lysine(ε-PL) is a new type of broad-spectrum natural food preservative. Because of its high cost and high price, its application in food industry is limited. In order to reduce the production cost, the effect of ammonia nitrogen (NH+4-N) concentration on the production of ε-PL by Streptomyces diastatochromogenes was studied. Results indicated that the yield of ε-PL was 0.95 g/L,improved by 15.13% compared with the control group and the activities of Ask and Pls were improved when the initial concentration of NH+4-N was 0.5 g/L fermented in shaking flasks for 96 h. An effective increasing ε-PL production method was verified by the batch and fed-batch fermentations: The initial concentration of NH+4-N was 2.5 g/L, ammonium sulfate maintains the concentration of 0.5 g/L in 5 L the fermenter by fed-batch. In this method, the final yield of ε-PL was 27.67 g/L, which was improved by 17.72% contrasting to the control group.
Key words:  Streptomyces diastatochromogenes    NH+4-N    ε-poly-L-lysine    fed-batch fermentation
收稿日期:  2020-01-07                出版日期:  2020-07-15      发布日期:  2020-08-04      期的出版日期:  2020-07-15
基金资助: 国家自然科学基金(31771952);国家重点研发计划课题项目(2018YFD0400205)
作者简介:  硕士研究生(贾士儒教授和谭之磊副研究员为共同通讯作者,E-mail:jiashiru@tust.edu.cn;tanzhilei@tust.edu.cn)
引用本文:    
魏希庆,郭凤柱,胡春磊,等. 氨氮对淀粉酶产色链霉菌产ε-聚赖氨酸的影响[J]. 食品与发酵工业, 2020, 46(13): 24-29.
WEI Xiqing,GUO Fengzhu,HU Chunlei,et al. Effect of ammonia nitrogen on the production of ε-poly-L-lysinein Streptomyces diastatochromogenes[J]. Food and Fermentation Industries, 2020, 46(13): 24-29.
链接本文:  
http://sf1970.cnif.cn/CN/10.13995/j.cnki.11-1802/ts.023292  或          http://sf1970.cnif.cn/CN/Y2020/V46/I13/24
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