黑曲霉对重楼皂苷VI的转化及其条件优化
首发时间:2012-11-23
摘要:目的 探索黑曲霉对重楼皂苷VI的最佳生物转化条件。方法 在Plackett-Burman法和最陡爬坡实验的基础上,通过中心组合设计法对生物转化条件进行优化。首先,通过Plackett-Burman法评价与生物转化相关的8个变量,最终确定K2HPO4浓度、FeSO4浓度、转化时间对转化具有显著影响。结果:获得转化产物,通过H-NMR C-NMR对转化产物进行了鉴定,确定是偏诺皂苷元。并通过中心组合设计实验确定了最佳转化条件分别为K2HPO4 1.2g/L, FeSO4 0.007 g/L和转化时间100 h。在最佳转化条件下,生物转化率为33.3%。结论:实验结果显示,黑曲霉将重楼皂苷VI转化为偏诺皂苷元。
关键词: 重楼皂苷VI 生物转化 Plackett-Burman 中心组合设计实验
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Optimization of Biotransformation Conditions of Paris Saponin VI by Aspergillus niger
Abstract:AIM: To investigate the biotransformation of Paris saponin VI by Aspergillus niger. METHODS: The biotransformation conditions were optimized with central composite design depended on Plackett-Burmann design and the path of steepest ascent. The Plackett-Burmann design was firstly used to evaluate the effects of 8 variables related to the biotransformation, and three statistically variables K2HPO4 concentration, FeSO4 concentration and biotransformation time were selected.RESULTS: The biotransformation product has been obtained and identified. And the levels of the three variables for the maximum biotransformation yield were determined by central composite design as follows: 1.2 g/L K2HPO4, 0.007 g/L FeSO4, biotransformation time (100 h). Under the optimization of biotransformation conditions, the biotransformation yield was increased by 33.3%. CONCLUSION: This result demonstrated that microbial culture parallels mammalian metabolism; therefore A. niger might be a useful tool for generating metabolites of related analogs of paris saponins for structural identification and for further use in pharmaceutical research.
Keywords: Paris saponin VI Biotransformation Plackett-Burman Central composite Design
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