食品科学

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响应面优化双水相萃取分离酵母源MT工艺

王 月1,张东杰1,*,王 颖1,2,*,梁小月1,徐炳政1   

  1. 1.黑龙江八一农垦大学食品学院,黑龙江 大庆 163319;2.国家杂粮技术工程研究中心,黑龙江 大庆 163319
  • 出版日期:2015-05-25 发布日期:2015-05-08
  • 通讯作者: 张东杰,王 颖
  • 基金资助:

    黑龙江省教育厅新世纪人才项目(2014-2016);黑龙江省博士后资助项目(LBH-Z13169)

Optimization of Extraction Process of Yeast Metallothionein by Aqueous Two-Phase System

WANG Yue1, ZHANG Dongjie1,*, WANG Ying1,2,*, LIANG Xiaoyue1, XU Bingzheng1   

  1. 1. College of Food Science, Heilongjiang Bayi Agricultural University, Daqing 163319, China;
    2. National Coarse Cereals Engineering Research Center, Daqing 163319, China
  • Online:2015-05-25 Published:2015-05-08
  • Contact: ZHANG Dongjie1, WANG Ying

摘要:

采用聚乙二醇(polyethylene glycol,PEG)-(NH4)2SO4双水相体系,分离铜诱导的诱变酿酒酵母菌所表达的金属硫蛋白。以PEG质量分数、(NH4)2SO4质量分数及pH值为考察因素,萃取率为响应值,结合Design-Expert 8.0.6软件做响应面优化分析,优化到最佳萃取条件:PEG相对分子质量2 000、PEG和(NH4)2SO4质量分数分别为22.5%和17.46%、pH 5.98。获取的金属硫蛋白主要分布在上相,萃取率可达81.69%。此方法操作简单、高效、成本低,是酵母源金属硫蛋白分离提纯的新方法。

关键词: 金属硫蛋白, 双水相萃取, 响应面分析, 分配系数, 萃取率

Abstract:

In this study, an aqueous two-phase system consisting of polyethylene glycol (PEG) and ammonium sulfate was
used to extract copper-induced metallothionein (MT) from a mutant strain of Saccharomyces cerevisiae. Response surface
methodology was employed to optimize three factors namely PEG concentration, (NH4)2SO4 concentration and pH that
influence extraction efficiency using the software Design-Expert 8.0.6. The optimal aqueous two-phase system for MT
extraction was determined to contain 22.5% PEG 2 000, 17.46% (NH4)2SO4 at pH 5.98. Under these optimal conditions, the
metallothionein was mainly distributed in the upper phase with an extraction rate of 81.69%. Therefore, this method can
provide a new, simple, convenient, economical and highly efficient strategy for the extraction of metallothionein from yeast.

Key words: metallothionein, aqueous two-phase system extraction, response surface methodology, distribution coefficient;extraction rate

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