Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2020, Vol. 36 ›› Issue (29): 78-86.doi: 10.11924/j.issn.1000-6850.casb20190900618

Special Issue: 生物技术

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Mannanase Production by Lactobacillus casei HDS-01: Condition Study

Zhang Xin1(), Wang Yao1, Jiang Jing1, Zhao Dan1,2()   

  1. 1Key Laboratory of Microbiology, Life Science College, Heilongjiang University, Harbin 150080
    2Engineering Research Center of Agricultural Microbiology Technology, Ministry of Education, Heilongjiang University, Harbin 150500
  • Received:2019-09-09 Revised:2019-11-25 Online:2020-10-15 Published:2020-10-16
  • Contact: Zhao Dan E-mail:zhangxin960327@163.com;zhaodan4u@163.com

Abstract:

The purpose of this research is to increase the mannanase production of Lactobacillus casei HDS-01 isolated from the fermentation liquid of pickled Chinese cabbage and lay a foundation for the separation, purification and industrial production of mannanase. The single factor experiment was carried out by setting different medium components and fermentation conditions based on MRS. Mannanase activity and L.casei HDS-01 growth were measured by DNS method and flat colony counting method, respectively. The results showed that the optimum condition for mannanase production by L. casei HDS-01 is: 0.8% pectin as optimum carbon source, 0.2% yeast extract and ammonium nitrate as optimum nitrogen source, 0.2% ammonium citrate, 0.1% dipotassium hydrogenphosphate and 0.9% sodium acetate as inorganic salts; 100 mL /250 mL liquid loading, 7% inoculation, 37℃ culture temperature and initial pH value of 5.5. Under the optimal condition, after 36 h of shaking at a speed of 140 r/min, the enzyme activity could reach 72.7±0.30 U/mL, which is 6.51 times higher than that before optimization.

Key words: Lactobacillus casei, lactic acid bacteria, mannanase, medium component, fermentation condition

CLC Number: