食品科学

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固定化地衣芽孢杆菌产弹性蛋白酶的研究

潘进权,钟德广   

  1. 岭南师范学院生命科学与技术学院,广东 湛江 524048
  • 发布日期:2014-12-15

Immobilization of Bacillus licheniformis for Enhanced Production of Elastase

PAN Jin-quan, ZHONG De-guang   

  1. School of Life Science and Technology, Lingnan Normal University, Zhanjiang 524048, China
  • Published:2014-12-15

摘要:

为提高弹性蛋白酶的发酵产能,构建地衣芽孢杆菌连续发酵产弹性蛋白酶的生产工艺,本研究采用单因素试验及响应面分析法对地衣芽孢杆菌凝胶包埋固定化的工艺进行探讨,并对固定化细胞的发酵产酶性能进行分析。结果表明,地衣芽孢杆菌的适宜固定化体系是聚乙烯醇(polyving akohol,PVA)、海藻酸钠(sodium alginate,SA)和CaCl2,质量分数分别为8.22%、2.27%和2.42%,固定化交联剂硼酸的质量分数为4%;固定化地衣芽孢杆菌发酵产弹性蛋白酶的活力可达到386 U/mL,是相同接种量的游离细胞发酵酶活力的87%;固定化的地衣芽孢杆菌凝胶球具有很好的稳定性,在摇瓶发酵的条件下可连续使用10 批次以上。以上结果表明,复合凝胶包埋制备的固定化地衣芽孢杆菌细胞可用于连续发酵产弹性蛋白酶的生产工艺。

关键词: 地衣芽孢杆菌, 固定化, 发酵, 弹性蛋白酶

Abstract:

To increase the fermentation titer unit of elastase with immobilized Bacillus licheniformis, the immobilization
process and fermentation characteristics of Bacillus licheniformis were investigated and optimized by single-factor
experiments and response surface methodology. After optimization, a proper immobilization system was determined,
which consisted of polyving akohol (PVA), sodium alginate (SA), calcium chloride and boric acid at a concentration by
mass of 8.22%, 2.27%, 2.42% and 4% respectively. Under the optimized conditions, the activity of elastase produced
from immobilized Bacillus licheniformis reached 386 U/mL, which was 87% of the fermentation yield with free cells. The
immobilized Bacillus licheniformis had good stability, and could be used in fermentation for more than 10 consecutive
batches. These experimental results indicate that the immobilized Bacillus licheniformis prepared by composite gel
entrapment can be used in continuous fermentation process for the production of elastase.

Key words: Bacillus licheniformis, immobilization, fermentation, elastase

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