食品科学 ›› 2018, Vol. 39 ›› Issue (20): 155-160.doi: 10.7506/spkx1002-6630-201820023

• 生物工程 • 上一篇    下一篇

碱性木聚糖酶产生菌株的分离鉴定与产酶分析

甘雅霆1,周慧1,李艳1,董重实1,赵硕2,闫达中1,*   

  1. (1.武汉轻工大学生物与制药工程学院,湖北?武汉 430023;2.中国科学院大学资源与环境学院,北京 100049)
  • 出版日期:2018-10-25 发布日期:2018-10-24
  • 基金资助:
    湖北省自然科学基金项目(2008CDB067)

Isolation and Identification of an Alkaline Xylanase-Producing Bacterium and Enzymatic Analysis

GAN Yating1, ZHOU Hui1, LI Yan1, DONG Zhongshi1, ZHAO Shuo2, YAN Dazhong1,*   

  1. (1. School of Biology and Pharmaceutical Engineering, Wuhan Polytechnic University, Wuhan 430023, China;2. College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China)
  • Online:2018-10-25 Published:2018-10-24

摘要: 目的:分离1?株高产碱性木聚糖酶菌株。方法:以木聚糖为唯一碳源,从造纸厂活性污泥中筛选1?株高产碱性木聚糖酶细菌,采用3,5-二硝基水杨酸法定糖法测定菌株产木聚糖酶的活力,并通过生理、生化特征以及16S?rRNA基因序列分析比对对菌株进行鉴定。结果:菌株YD01所产木聚糖酶的最适pH值为8.0,最适温度为50?℃;在pH?10和80?℃时,仍有87%和85%的剩余酶活力,具有较好的耐碱性及较高的热稳定性。最终发酵产酶水平为36.85?U/mL。结论:鉴定该菌株为蛾微杆菌(Microbacterium imperiale),所产生的木聚糖酶具有较高的碱耐受性和热稳定性。

关键词: 碱性木聚糖酶, 蛾微杆菌, 鉴定

Abstract: Objective: This study aimed to isolate a strain with high alkaline xylanase activity. Methods: The target strain was isolated with xylan as the only carbon source from the paper mill sludge. The xylanase activity was determined by the 3,5-dinitrosalicylic acid (DNS) method. The strain was identified based on physiological, biochemical and 16S rRNA gene sequence analysis. Results: The optimal pH of the xylanase enzyme was 8.0, and the optimum temperature was 50 ℃. The enzyme retained 87% and 85% of its initial activity at pH 10 and 80 ℃, respectively. It proved to be highly stable to both alkali and heat. The xylanase activity of the fermentation broth of the strain was 36.85 U/mL. Conclusion: This strain was identified as Microbacterium imperiale, which could produce a thermo-alkali-stable xylanase.

Key words: alkaline xylanase, Microbacterium imperiale, characterization

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