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中国农学通报 ›› 2016, Vol. 32 ›› Issue (2): 33-39.doi: 10.11924/j.issn.1000-6850.casb15090011

所属专题: 生物技术

• 生物技术科学 • 上一篇    下一篇

聚乙烯醇降解菌HK1产酶条件优化

宋亚珩1,周云横1,李素俭1,刘云柯1,卫亚红1,2,3   

  1. (1西北农林科技大学生命科学学院,陕西杨凌 712100;2西北农林科技大学旱区作物逆境生物学国家重点实验室,陕西杨凌 712100;3西北农林科技大学旱区生物质能研究中心,陕西杨凌 712100)
  • 收稿日期:2015-09-06 修回日期:2016-01-04 接受日期:2015-10-23 出版日期:2016-01-28 发布日期:2016-01-28
  • 通讯作者: 卫亚红
  • 基金资助:
    杨凌示范区科技计划项目“聚乙烯醇降解菌酶学特性及降解菌剂研发”(2015NY-07)。

Optimization of Poly (Vinyl Alcohol)-Degrading Enzyme Production Condition in Bacillus amyloliquefaciens HK1

Song Yaheng1, Zhou Yunheng1, Li Sujian1, Liu Yunke1, Wei Yahong1,2,3   

  1. (1College of Life Sciences, Northwest A & F University, Yangling Shaanxi 712100;2State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A
  • Received:2015-09-06 Revised:2016-01-04 Accepted:2015-10-23 Online:2016-01-28 Published:2016-01-28

摘要: 以聚乙烯醇为唯一碳源从堆肥中筛选所得降解细菌HK1为出发菌株,对该菌株产酶条件进行了研究。首先通过无色透明圈法确定产酶方式,然后采用单因子试验和正交试验优化菌株HK1的产酶条件。结果表明,该菌在细胞内外均有PVA降解酶的分布,并且胞外酶活水平最高。该菌产酶最佳装液量为50 mL/250 mL三角瓶,最佳接种量为6%,最适温度30℃,最佳碳源和氮源种类分别为PVA和NH4NO3。通过正交试验优化,得出该菌产酶的最佳营养条件为:PVA浓度2.5 g/L,NH4NO3 0.6 g/L,pH 7.0。在此条件下,菌株HK1产酶能力是优化前的225%。

关键词: 土地生态状况, 土地生态状况, 精细评估, ArcGIS, 山阳区, 熵值法

Abstract: The strain HK1 was isolated from environment, which could degrade polyvinyl alcohol. Using the I2-KI and boric acid staining method, it was proved that HK1 had intracellular and extracellular degrading enzymes, mainly extracellular enzymes. Optimization of culture conditions was carried out through mono-factor and orthogonal experiments. The results showed that: the optimum loading volume, inoculum density and culture temperature was 50 mL/250 mL, 6% and 30℃, respectively. The optimum external carbon source and nitrogen source was PVA and NH4NO3, respectively. The optimal fermentation condition was: PVA 2.5 g/L and NH4NO3 0.6 g/L at pH 7.0. Under the optimal fermentation condition, the production of degrading enzyme of strain HK1 was 225% higher than when it was cultured in former fermentation condition.

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