食品科学 ›› 2011, Vol. 32 ›› Issue (9): 31-35.doi: 10.7506/spkx1002-6630-201109007

• 基础研究 • 上一篇    下一篇

铁棍山药蛋白质的分离纯化及体外抗氧化活性

周晓薇,王静,段浩,顾镍,刘红彦,曾晓雄   

  1. 1. 南京农业大学食品科技学院
    2. 河南省农业科学院植物保护研究所
  • 出版日期:2011-05-15 发布日期:2011-04-11
  • 基金资助:
    南京农业大学SRT 计划项目(0908A08)

Extraction, Purification and Antioxidant Activity in vitro of Protein Fractions from Dioscorea opposita Thunb. cv. Tiegun

ZHOU Xiao-wei1,WANG Jing1,DUAN Hao1,GU Nie1,LIU Hong-yan2,ZENG Xiao-xiong1,*   

  1. 1. College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, China; 2. Institute of Plant Protection, Henan Academy of Agricultural Sciences, Zhengzhou 450002, China
  • Online:2011-05-15 Published:2011-04-11

摘要: 以铁棍山药为材料,研究其蛋白质的分离纯化及体外抗氧化活性。山药粗蛋白质经 DEAE- 52纤维素层析柱及Sephadex G-100层析柱纯化,得到两个蛋白质组分PDOT-1和PDOT-2,经SDS-PAGE电泳,发现蛋白质分子质量分布在20、31、50kD和66kD。体外抗氧化实验表明山药粗蛋白质、PDOT-1和PDOT-2对DPPH自由基、O2-、 ·OH具有较明显的清除作用,并且对Fe2+具有较强的螯合作用。因此铁棍山药蛋白质具有较好的抗氧化活性,可作为潜在的抗氧化剂或抗衰老药物进行深入研究。

关键词: 铁棍山药, 蛋白质, 分离纯化, 抗氧化活性

Abstract: Crude protein extracted from Dioscorea opposita Thunb.cv. Tiegun by saturated ammonium sulfate precipitation was purified/fractionized by DEAE-52 ion exchange chromatography, and two fractions were obtained and named as PDOT-1 and PDOT-2, respectively. Further Sephadex G-100 chromatography revealed that both fractions were composed of a single component. The non-reducing SDS-PAGE pattern of PDOT-1 displayed three protein bands with a molecular mass of respectively 20, 31 kD and 50 kD and only one 66 kD protein band was observed in that of PDOT-2. It was found that the crude protein, PDOT-1 and PDOT-2 had obvious radical scavenging activities on DPPH, superoxide anion and hydroxyl free radicals as well as strong ferrous ion-chelating capacity. We concluded that proteins from Dioscorea opposita Thunb.cv. Tiegun have antioxidant activity and deserve to be studied in depth as a potential anoxidant or anti-aging drug.

Key words: Dioscorea opposita Thunb.cv. Tiegun, protein, extraction and purification, antioxidant activity

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