远东疣柄牛肝菌多糖的提取分离、组成分分析及抗氧化性研究
发布时间:2018-01-01 02:37
本文关键词:远东疣柄牛肝菌多糖的提取分离、组成分分析及抗氧化性研究 出处:《沈阳农业大学》2017年硕士论文 论文类型:学位论文
更多相关文章: 远东疣柄牛肝菌 多糖 分离纯化 组成分 抗氧化
【摘要】:远东疣柄牛肝菌是一种兼具食药两用的大型真菌,其色素提取物、多酚提取物等具有一定的生物活性,但多糖的研究还未见报道。本文以远东疣柄牛肝菌为试验材料,对该种多糖的提取条件进行优化、对单糖的组成分分析及抗氧化活性的进行初步探究。结果如下:1.采用热水浸提法提取远东疣柄牛肝菌的多糖(命名为LEP,下同),响应面分析法(RSM)优化多糖的提取条件。通过优化得到多糖的最佳提取条件是:液料比33:1 mL/g,提取时间3h,提取温度75℃,在此条件下远东疣柄牛肝菌多糖的最佳得率是10.30%。2.LEP经DEAE-52纤维素柱层析分离和Sephadex G-100凝胶柱层析纯化,共得到三个单一组分LEP-1、LEP-2和LEP-3。其中,LEP-1是中性糖由蒸馏水洗脱获得,LEP-2和LEP-3是酸性糖由NaCl洗脱获得。3.红外光谱法分析LEP-2的组成分。图谱结果显示LEP-2不仅有β-吡喃糖苷键,而且还是一种酸性糖,有糖醛酸存在。红外光谱有如下主要吸收峰:3309.12cm-1、2926.35 cm1、1601.73 cm-1·1416.48 cm-1·1366.77 cm-1、1247.37 cm-1、1035.02 cm-1、918.89 cm-1、796.78 cm-1。说明LEP-2中含有O-H、C-H、羰基C=O对称及非对称区域、葡萄糖中特有的-OH变角振动区域、β-吡喃糖苷键、甘露糖等区域。4.高效凝胶过滤色谱法分析LEP-2的分子量和单糖组成。结果显示:分子量等于342375 Da;由岩藻糖:阿拉伯糖:半乳糖:葡萄糖:木糖:甘露糖=1.82:0.61:5.14:26:5.41:61.02。5.通过测定自由基(·OH、DPPH·、O2-·)清除能力,来评价LEP及纯化组分的抗氧化活性。实验结果如下:在样品是1mg/mL时,·OH的清除能力:LEP-1LEP-2LEP-3LEP;对 O2-·的清除能力:LEPLEP-2LEP-1LEP-3;对 DPPH·的清除能力:LEPLEP-3LEP-1LEP-2。实验结果证明该种多糖具有一定的抗氧化能力,且与多糖的质量浓度之间具有一定的线性剂量关系。
[Abstract]:Boletus verrucum is a kind of macrofungi with both food and medicine. Its pigment extract polyphenol extract and so on have certain biological activity. However, the study of polysaccharides has not been reported. In this paper, the extraction conditions of the polysaccharides were optimized by using Boletus verrucosa as the experimental material. The composition analysis and antioxidant activity of monosaccharide were studied. The results are as follows: 1. Extraction of polysaccharides from Boletus verrucosa by hot water extraction (named LEP, the same below). Response surface analysis (RSM) was used to optimize the extraction conditions of polysaccharides. The optimum extraction conditions were as follows: the ratio of liquid to material was 33: 1 mL / g, the extraction time was 3 h, and the extraction temperature was 75 鈩,
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