食品科学 ›› 2012, Vol. 33 ›› Issue (13): 112-115.doi: 10.7506/spkx1002-6630-201213023

• 基础研究 • 上一篇    下一篇

葛根抗氧化肽的分离及清除自由基活性研究

赵艳景,张岩   

  1. 淮海工学院 江苏省海洋生物技术重点建设实验室
  • 出版日期:2012-07-15 发布日期:2012-07-27
  • 基金资助:
    江苏省自然科学基金项目(BK2009641);江苏省海洋生物技术重点建设实验室开放基金项目(HS07014); 淮海工学院引进人才科研启动基金项目(KQ07018)

Separation and Free Radical Scavenging Activity of Antioxidant Peptide from Radix Puerariae

ZHAOYan-jing,ZHANGYan   

  1. (Jiangsu Key Laboratory of Marine Biotechnology, Huaihai Institute of Technology, Lianyungang 222005, China)
  • Online:2012-07-15 Published:2012-07-27

摘要: 目的:分离纯化葛根抗氧化肽并对其进行体外清除自由基活性的研究。方法:以野生葛根为实验材料,经30%的乙醇浸提、透析、冷冻干燥,进一步采用DEAE阴离子交换层析,反相高效液相色谱的方法,对葛根抗氧化肽进行纯化,对不同组分进行还原能力的测定,还原能力最强的命名为PE1。对PE1进行茚三酮反应和分子质量测定。采用邻苯三酚自氧化法、DPPH法、Fenton反应法检测PE1体外对超氧阴离子自由基、DPPH自由基、羟自由基的清除作用。结果:反相高效液相色谱检测PE1纯度,显示为单一峰,PE1与茚三酮反应呈阳性,分子质量约为746D,PE1在体外可以有效清除以上3种自由基。在质量浓度为0.652mg/mL时,羟自由基清除率可达到80.01%;在5mg/mL质量浓度条件下,对超氧阴离子自由基的清除率高达97.35%;在3.5mg/mL质量浓度条件下,对DPPH自由基的清除率达到75.02%,其IC50为2.83mg/mL。结论:PE1具有较强的清除自由基活性。

关键词: 葛根, DEAE层析, 抗氧化肽, 自由基

Abstract: Objective: To separate, purify and biologically characterize antioxidant peptides from Radix Puerariae. Methods: Widely grown Radix Puerariae was extracted with 30% ethanol aqueous solution, dialyzed, lyophilized, purified by DEAE anion exchange chromatography and reversed-phase HPLC to obtain an antioxidant peptide fraction with the highest reducing power, named as PE1. PE1 was tested by ninhydrin reaction and its molecular weight was measured. Moreover, the scavenging effects in vitro on superoxide anion (by pyrogallol autoxidation method), DPPH and hydroxyl radicals (by Fenton reaction method) were evaluated. Results: A single peak was observed in the reversed-phase HPLC pattern of PE1. The reaction between PE1 and ninhydrin was positive, and the molecular weight of PE1 was approximately 746 D. PE1 was effective in scavenging superoxide anion, DPPH and hydroxyl radicals. The scavenging rate was 80.01% at 0.652 mg/mL against hydroxyl radicals, 97.35% at 5 mg/mL against superoxide anion radicals and 75.02% at 3.5 mg/mL against DPPH radicals with an IC50 of 2.83 mg/mL. Conclusion: PE1 has strong radical scavenging activity.

Key words: Radix Puerariae, DEAE ion-exchange chromatography, antioxidant peptide, free radical

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