天然产物研究与开发 ›› 2015, Vol. 27 ›› Issue (8): 1334-1339.doi: 10.16333/j.1001-6880.2015.08.003

• 研究论文 • 上一篇    下一篇

穿山龙多糖DMA的结构和抗氧化活性研究

李志明,罗巅辉,王昭晶*   

  1. 华侨大学生物工程与技术系,厦门361021
  • 出版日期:2015-08-29 发布日期:2015-09-01

Structure and Antioxidant Activities of Polysaccharide from Fraction-DMA of Dioscorea nipponica Makino

LI Zhi-ming,LUO Dian-hui,WANG Zhao-jing*   

  1. Huaqiao University,Department of Bioengineering and Biotechnology,Xiamen 361021,China
  • Online:2015-08-29 Published:2015-09-01

摘要: 采用热水煮提法和DEAE-琼脂糖凝胶CL-6B凝胶层析对穿山龙多糖DMA进行提取和分离纯化。通过高效液相色谱法和气相色谱法鉴定DMA的纯度和糖原组成。采用红外光谱法,高碘酸氧化-Smith降解法,甲基化分析以及核磁共振法对多糖DMA的结构进行分析。利用羟自由基实验研究DMA的抗氧化活性。研究发现多糖DMA显示一个单一对称的色谱峰,主要由葡萄糖组成,是由→6)-α-D-Glc-p-(1→组成的多糖。DMA具有清除羟自由基的活性。

关键词: 穿山龙, 多糖, 抗氧化活性, 核磁共振

Abstract: Boiling-water extraction and a DEAE-Sepharose CL-6B column chromatography were used to isolate and purify the major polysaccharide DMA from Dioscorea nipponica. Purification and compositional analysis of DMA were carried with HPLC and GC-FID analysis.IR analysis,periodate oxidation-smith degradation, methylation analysis and NMR studies (1H, 13C, 1H-1H COSY and HSQC) were used to identify its structure.On the basis of hydroxyl radical assay,its antioxidant activity was investigated.The results showed that the purified fraction DMA was a single peak,and it mainly comprised of glucose.The repeating unit of DMA was →6)-α-D-Glc-p-(1→.DMA exhibited a scavenging activity for hydroxyl radical.

Key words: Dioscorea nipponica Makino, polysaccharide, antioxidant activity, NMR spectroscopy

中图分类号: 

Q53