摘要
【目的】以发酵液纤溶酶活力为指标,优化海洋来源的链霉菌菌株MY0504的发酵条件。【方法】在菌株生长曲线及单因素试验基础上,采用Plackett-Burman设计筛选影响纤溶酶活性的主要因素,进一步用最陡爬坡试验及Box-Behnken中心组合设计法优化发酵条件。【结果】纤溶酶活性最高的发酵条件为:葡萄糖21.68 g/L,酵母粉25.31 g/L,NaCl5.0 g/L,K_2HPO_4·3H_2O3.0 g/L,MgSO_4·7H_2O 0.5 g/L,FeSO_4·7H_2O 0.02 g/L,装液量50 mL(250 mL摇瓶),接种量10%(体积比),初始pH 7.5,温度24°C,转速200 r/min,培养时间4.5 d。发酵液纤溶酶活性可达2 190.6 U/mL。【结论】确定了MY0504菌株产纤溶酶的最优发酵条件,为该酶的进一步分离纯化及性质研究奠定基础。
[Objective] To optimize the fermentation conditions of Streptomyces strain MY0504 from marine environment and improve the fibrinolytic activity in fermentation broth. [Methods] Based on the growth curve of MY0504 and single factor test, the main factors affecting enzyme activity were found through the Plackett-Burman design,ahd the fermentation conditions were further optimized using steepest ascent experiment and Box-Beh(lken central composite design. [Results] The optimal fermentation conditions were as follows: glucose 21.68 g/L, yeast powder 25.31 g/L, NaC1 5.0 g/L, K2HPO4"3H20 3.0 g/L, MgSO4"7H20 0.5 g/L, FeSO4"7H20 0.02 g/L, medium volume 50 mL (250 mL flask), inoculum size 10% (V/V), initial pH 7.5, fermentation temperature 24℃, shaking speed 200 r/min, fermentation time 4.5 d. The enzyme activity reached 2 190.6 U/mL in fermentationbroth. [Conclusion] The optimal fermentation conditions of strain MY0504 producing fibrinolytic enzyme were obtained, which lay a foundation for further purification and characterization of the fibrinolytic enzyme.
出处
《微生物学通报》
CAS
CSCD
北大核心
2017年第5期1009-1016,共8页
Microbiology China
基金
河北省科技厅科技支撑项目(No.14273201D)~~
关键词
海洋
链霉菌
纤溶酶
发酵优化
单因素试验
响应面
Keywords: Ocean, Streptomyces, Fibrinolytic enzyme, Fermentation optimization, Single factor test,Response surface