食品科学 ›› 2006, Vol. 27 ›› Issue (3): 130-133.

• 工艺技术 • 上一篇    下一篇

开菲尔基质提取、分离条件的选择

韩辉, 李博, 籍保平   

  1. 中国农业大学食品科学与营养工程学院
  • 出版日期:2006-03-15 发布日期:2011-09-06

Study on Extraction and Isolation of Kefiran from Kefir

 HAN  Hui, LI  Bo, JI  Bao-Ping   

  1. College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
  • Online:2006-03-15 Published:2011-09-06

摘要: 开菲尔基质(kefiran)是发酵乳开菲尔(kefir)中乳酸菌产生的胞外多糖,为水溶性多糖,分子量在1000kD以上。本文采用水提醇沉的方法,对发酵乳体系中kefir胞外多糖kefiran、荚膜kefiran的提取分离因素进行了研究。经过试验确定开菲尔基质的优化分离条件为:发酵液中添加2%氯化钠电解质溶液;三氯乙酸添加量15%(以上清液质量为基准)进一步除残余蛋白质;醇沉pH为7。Kefiran提取方法经过优化后其得率为基本方法的3.06倍,优化效果显著。荚膜多糖的最佳提取方法是超声波法。

关键词: 开菲尔, 开菲尔胞外多糖, 提取方法

Abstract: Kefiran is a water soluble exopolysaccharide produced by lactic acid bacteria in kefir. The molecular weight is morethan 1000 kD. Water extraction and alcohol precipitation are used to isolate the kefiran from kefir. Factors influencing the extractionand the separation of extracellular kefiran and capsular kefiran in the fermented milk system are studied. The optimum separationconditions are: the fermented milk by adding 2% NaCl solution; 15% trichloroacetic acid ( based on the mass of the supernatant)to eliminate remnant protein; and alcohol for precipitation at pH 7.0. The kefiran yield is increased from 139.66mg/L to 427.33mg/L afteroptimization. And the optimum method to extract capsular kefiran is by sonication at 50W for 3min at 4℃.

Key words:  , kefir; kefiran; extraction;