Extraction technique of allicin from Chinese garlic by ultrasonic-assisted aqueous two-phase system
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摘要: 为了探索大蒜素的提取纯化工艺,采用超声波处理和双水相体系相结合的方法提取大蒜中的大蒜素。选用新鲜大蒜为实验原料,以大蒜素的提取率为实验指标,考查聚乙二醇质量分数、硫酸铵质量分数、p H和超声时间等因素对大蒜素提取率的影响。然后采用响应曲面分析法,对聚乙二醇质量分数、p H和超声时间进行三因素三水平的优化实验,并建立了相应的回归模型。结果表明,聚乙二醇质量分数、p H和超声时间对大蒜素提取率影响显著,显著性顺序为:p H>聚乙二醇质量分数>超声时间;最佳提取工艺条件为:聚乙二醇质量分数19.4%,p H3.0,超声时间55min。在此条件下,大蒜素提取率的预测值为88.91%,实验值为88.89%±0.0112%,实验值与预测值基本相符。Abstract: In order to explore extraction method of allicin from Chinese garlic, ultrasonic assisted aqueous twophase system extraction method was used on extraction of allicin from Chinese garlic. Using fresh garlic as material, with the extraction yield of allicin as an experimental index, the effect of operating conditions such as PEG mass fraction, ammonium sulfate mass fraction, p H and time of ultrasonic processing were investigated.Three-factor three-level experiment based on response surface analysis method was applied to optimize the extraction conditions, the simulated regression equation of prediction model was established. Results showed that the significance order of PEG mass fraction, p H and time of ultrasonic processing was:p H >PEG 4000 mass fraction>ultrasonic time. The optimal extraction conditions for PEG 4000 mass fraction of 19.4%, p H3.0, ultrasonic processing time of 55 minutes. Under this condition, the prediction value of extraction yield of allicin was 88.91%, the experimental value was 88.89±0.0112%, which were almost consistent with the prediction value.
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