食品科学 ›› 2012, Vol. 33 ›› Issue (20): 113-118.

• 工艺技术 • 上一篇    下一篇

条斑紫菜蛋白提取与抗氧化活性

姚兴存,舒留泉,盘赛昆,王洪斌   

  1. 淮海工学院 江苏省海洋生物技术重点实验室
  • 收稿日期:2011-08-11 修回日期:2012-09-19 出版日期:2012-10-25 发布日期:2012-11-09
  • 通讯作者: 姚兴存 E-mail:yaoxingcun@126.com
  • 基金资助:

    江苏省海洋生物技术重点建设实验室开放课题;江苏省科技厅科技支撑计划项目

Extraction and Antioxidant Activity of Proteins from Porphyra yezoensis

YAO Xing-cun,Liu-Quan SHU, ,   

  • Received:2011-08-11 Revised:2012-09-19 Online:2012-10-25 Published:2012-11-09
  • Contact: YAO Xing-cun E-mail:yaoxingcun@126.com

摘要: 以条斑紫菜为原料,探讨超声波辅助提取紫菜蛋白的超声时间、温度、料液比3个因素对提取率的影响,用响应面法优化后的紫菜蛋白提取工艺条件为超声时间10min、温度50℃、料液比10:1(mg/mL),在此条件下的实际提取率为37.6%。采用Superdex 200凝胶过滤层析和SDS-聚丙烯酰胺凝胶电泳法,分离纯化紫菜蛋白并测定其分子质量和抗氧化活性。结果表明:紫菜蛋白由3类分子质量分别为55、22、17ku的蛋白质(亚基)组成,这3类分子质量蛋白质都有明显的抗氧化活性,抗氧化活性随分子质量的降低而增大;实验测得紫菜蛋白清除羟自由基的IC50为1.481mg/mL,清除DPPH自由基的IC50为0.452mg/mL,紫菜蛋白具有较强的抗氧化活性。

关键词: 条斑紫菜, 蛋白质, 提取, 分离纯化, 抗氧化

Abstract: Response surface methodology was employed to optimize the extraction of proteins from Porphyra yezoensis. The extraction efficiency of proteins was investigated with respect to ultrasonic treatment time, temperature and solid/solvent ratio. The optimum conditions for the extraction of proteins from Porphyra yezoensis were determined as 10 min, 50 ℃ and 10:1 (mg/mL). Under these conditions, the actual extraction efficiency of proteins was 37.6%. The resulting extract was separated by Superdex 200 column chromatography into four fractions and their molecular weights were measured. A pooled sample of fractions 1, 2 and 3, all of which were proteins with a molecular weight larger than 10 ku and obvious free scavenging activity, was analyzed by SDS-PAGE and evaluated for scavenging activities against hydroxyl and DPPH free radicals. The molecular weights of fractions 1, 2 and 3 were 55, 22 ku and 17 ku as measured by SDS-PAGE. Pooled fractions 1, 2 and 3 possessed a marked free radical scavenging activity in a dose-dependent manner. The IC50 values against hydroxyl and DPPH free radicals were 1.481 mg/mL and 0.452 mg/mL, respectively.

Key words: Porphyra yezoensis, protein, extraction, separation and purification, antioxidant activity

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