食品科学

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双歧杆菌RH胞外多糖提取纯化及体外抗凝血活性评价

李 辉,宋居易,刘 蕾,李平兰*   

  1. 中国农业大学食品科学与营养工程学院,北京 100083
  • 发布日期:2014-12-15

Extraction, Purification and in vitro Anticoagulant Activity of Exopolysaccharides from Bifidobacterium animalis RH

LI Hui, SONG Ju-yi, LIU Lei, LI Ping-lan*   

  1. College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
  • Published:2014-12-15

摘要:

为得到高纯度双歧杆菌RH胞外多糖,并探讨其抗凝血功效,采用正交试验优化酶解提取工艺。优化最佳酶解条件为:蛋白酶添加量2 g/L,中性蛋白酶与胰蛋白酶质量比例为1∶2,在pH 7.5的条件下酶解120 min。再经凝胶Sepharose CL-6B柱层析纯化,得到胞外多糖纯品。利用凝胶色谱结合多角度激光散射仪测得该胞外多糖分子质量为5.946×104 D。进一步对其抗凝血活性进行评价,不同质量浓度胞外多糖可以显著延长活化部分凝血活酶时间和凝血酶时间,且具有剂量依赖效应。纯化后胞外多糖纯度可以达到97%以上,纯多糖具有较好的体外抗凝血活性,主要参与内源凝血途径。

关键词: 双歧杆菌, 胞外多糖, 提取, 纯化, 抗凝血

Abstract:

Exopolysaccharides (EPS) are water-soluble extracellular polysaccharides with potential biological activities.
In this study, we investigated the extraction, purification and anticoagulant activity of the EPS produced by Bifidobacteria
animalis RH. The optimal enzymatic hydrolysis conditions were found to be 120 min hydrolysis using a mixture of neutral
protease with trypsin (1:2) at a total concentration of 2 g/L with an initial pH of 7.5 by orthogonal array design. The EPS
was purified by Sepharose CL-6B column chromatography. The purity was 97.045% and the average molecular mass of
the EPS was 5.946 × 104 D as determined by GPC/MALLS. Furthermore, anticoagulant activity in vitro tests showed
the EPS could significantly prolong activated partial thromboplastin time (APTT) and thrombin time (TT) in a dosedependent
manner, rather than prothrombin time (PT). These results demonstrated that the EPS exhibited a significant
anticoagulant activity in vitro.

Key words: Bifidobacterium, exopolysaccharides, extraction, purification, anticoagulation

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