生物技术通报 ›› 2015, Vol. 31 ›› Issue (1): 144-150.doi: 10.13560/j.cnki.biotech.bull.1985.2015.01.022

• 研究报告 • 上一篇    下一篇

高产耐高温脂肪酶生产菌的筛选与鉴定

李杨 蔡海莺 赵敏洁 张辉 冯凤琴   

  1. (浙江大学生物系统工程与食品科学学院 馥莉食品研究院 浙江省农产品加工技术研究重点实验室 浙江省食品加工技术与装备工程中心,杭州 310058)
  • 收稿日期:2014-06-25 出版日期:2015-01-09 发布日期:2015-01-10
  • 作者简介:李杨,女,硕士研究生,研究方向:微生物发酵;E-mail:yangyangbaobei1989@126.com
  • 基金资助:
    浙江省重大科技专项(2012C12005-2),浙江省植物食品加工技术科技创新团队项目(2010R50032)

Screening and Identification of High-yield Thermostable Lipase Producing Microorganisms

Li Yang, Cai Haiying, Zhao Minjie, Zhang Hui, Feng Fengqin   

  1. Zhejiang University,College of Biosystems Engineering and Food Science,Fuli Institute of Food Science,Zhejiang Key Laboratory for Agro-Food ProcessingZhejiang R & D Center for Food Technology and EquipmentHangzhou 310058)
  • Received:2014-06-25 Published:2015-01-09 Online:2015-01-10

摘要: 从小笼包蒸屉垫中筛选得到了两株脂肪酶高产菌株J2和J3,经形态观察以及26S rRNA基因(26S rDNA)序列比对鉴定,两株菌分别属于Aureobasidium 属的两个变体。200 r/min、30℃下摇瓶发酵3-5 d后,以对硝基苯酚棕榈酸酯(p-NPP)作为底物,用分光光度法测得J2和J3发酵上清液中的脂肪酶酶活分别为10.61 U/mL和14.43 U/mL。对两株菌所产脂肪酶的耐热特性研究显示,菌株J2产脂肪酶的最适反应温度为50℃,并且酶液在50℃保温5 h无酶活损失;另一株菌J3所产脂肪酶的最适反应温度为60℃,酶液在50℃保温5 h后酶活剩余42.19%,在40℃保温5 h没有酶活损失。这表明J2和J3菌株所产脂肪酶具有较好的热稳定性和较高的最适反应温度。

关键词: 脂肪酶, 热稳定性, 出芽短梗霉, 26S rDNA, 生长曲线

Abstract: Two strains of microorganisms(J2 and J3)with a high-yield lipase producing ability had been screened from dumplings’ steamer cushions, and identified as two variants of Aureobasidium sp. according to morphological observation and 26S rRNA gene(26S rDNA)sequencing. After being incubated at 30℃, 200 r/min for 3-5 d, the lipase activities of their fermentation supernatant were 10.61 U/mL and 14.43 U/mL, respectively, measured by spectrophotometry with p-nitrophenol palmitate(p-NPP)as a substrate. The investigation of physicochemical properties of the produced lipases(Lip2 and Lip3)showed that the optimum catalyzing temperature of Lip2 is 50℃ and there is no significant activity loss after being incubated at 50℃ for 5 h, while the optimum catalyzing temperature of Lip3 is 60℃ and there is no activity loss after being incubated at 40℃ for 5 h, but only 42.19% of lipase activity remained when incubated at 50℃ for 5 h. The results indicated that the lipases produced by strain J2 and J3 have good thermal stability and high optimal reaction temperature.

Key words: lipase, thermostability, Aureobasidium sp., 26S rDNA, growth curve