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林产化学与工业 ›› 2011, Vol. 31 ›› Issue (1): 68-72.

• 研究报告 • 上一篇    下一篇

绵麦冬多糖的分离纯化及自由基清除活性

黄妮, 熊双丽, 卢飞   

  1. 西南科技大学 生命科学与工程学院, 四川 绵阳 621010
  • 收稿日期:2010-07-06 修回日期:1900-01-01 出版日期:2011-02-28 发布日期:2011-02-28
  • 通讯作者: 熊双丽,女,副教授,硕士生导师,研究方向为碳水化合物与生物技术;E-mail:lxberry225@yahoo.com.cn。

Extraction, Purification and Radical Scavenging Activity of the Polysaccharides from Ophiopogon japonicus

HUANG Ni, XIONG Shuang-li, LU Fei   

  1. School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China
  • Received:2010-07-06 Revised:1900-01-01 Online:2011-02-28 Published:2011-02-28

摘要: 绵麦冬经乙醇除脂后,用超声波辅助法进行提取,再经三氯乙酸除蛋白,乙醇沉淀后得粗多糖(CP)。用DEAE-Sepharose Fast Flow离子交换柱色谱分离纯化粗多糖,并进行光谱学分析和自由基清除活性探讨。结果显示:经离子交换柱首次分离出1种中性糖(NP)和3种酸性糖(AP)。中性糖的1,1-二苯基-2-三硝基苯肼自由基(DPPH·)和羟自由基清除(·OH)能力都不强;3种AP的DPPH·和·OH清除能力为AP3>AP2>AP1。AP3具有极高的·OH清除能力。粗多糖的·OH清除能力随浓度变化大于AP1和AP2,DPPH·清除能力显著高于纯化后的多糖。各糖对DPPH·清除能力的半数抑制质量浓度(IC50)分别为:AP1 22.30g/L,AP2 9.96g/L和AP3 7.70g/L,CP 2.01g/L;对·OH清除能力的IC50分别为:AP1 8.42g/L、AP2 25.73g/L和AP3 1.86g/L, CP 4.93g/L。

关键词: 绵麦冬, 多糖, 分离纯化, 自由基清除活性

Abstract: Crude polysaccharides(CP)were obtained from Ophiopogon japonicus(Thumb.)Ker-Gawl by ultrasonic extraction, followed by trichloracetic acid deproteination and ethanol precipitation. CP were further purified by DEAE-sepharose fast-flow ion-exchange column chromatography. Finally the spectroscopy of CP was analyzed and the free radical scavenging activities of various fractions toward DPPH· and ·OH were studied. One neutral polysaccharide(NP)and three kinds of acidic polysaccharides(AP) were separated by DEAE-sepharose FF. The result showed that NP has very low activities in scavenging DPPH· and ·OH. The ability of three kinds of AP for scavenging DPPH· and ·OH were in the sequence of: AP3>AP2>AP1. AP3 has high ability of scavenging ·OH. CP has very high ability of scavenging DPPH· , and its ability of scavenging ·OH changed rapidly with the concentration change. The IC50 of various polysaccharides toward DPPH· were: AP1 22.30g/L,AP2 9.96g/L,AP3 7.70g/ L; CP 2.01g/L. The IC50 of various polysaccharides toward ·OH were: AP1 8.42g/L,AP2 5.73g/L,AP3 1.86g/ L; CP 4.93g/L.

Key words: Ophiopogons japonicus(Thumb.)Ker-Gawl, polysaccharides, extraction and purification, free radical scavenging activity

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