食品科学 ›› 2011, Vol. 32 ›› Issue (21): 98-101.doi: 10.7506/spkx1002-6630-201121020

• 基础研究 • 上一篇    下一篇

酸法提取菜籽多糖的抗氧化活性研究

税 丹1,王立峰1,2,袁 建1,何 荣2,王雪峰1,高瑀珑1,鞠兴荣1,*   

  1. 1.南京财经大学食品科学与工程学院,江苏省粮油品质控制及深加工技术重点实验室 2.江南大学食品学院
  • 出版日期:2011-11-15 发布日期:2011-11-11
  • 基金资助:
    农业科技成果转化基金项目(2009GB2C100123);江苏省农业科技自主创新基金项目(cx(10)444;cx(10)234)

Kinetic Modeling of the Thermal Stability of EGCG in an Ultrasonic Filed

SHUI Dan1,WANG Li-feng1,2,YUAN Jian1,HE Rong2,WANG Xue-feng1,GAO Yu-long1,JU Xing-rong1,*   

  1. (1. Key Laboratory of Grain and Oils Quality Control and Deep-Utilizing Technology of Jiangsu Province, College of Food Science and Engineering, Nanjing University of Finance and Economics, Nanjing 210003, China; 2. School of Food Science and Technology, Jiangnan University, Wuxi 214122, China)
  • Online:2011-11-15 Published:2011-11-11

摘要: 为进一步开发利用菜籽资源,本研究从菜籽饼粕中以酸法提取菜籽多糖并对其抗氧化性进行研究。测定指标包括还原能力、DPPH自由基清除能力、羟自由基( ·OH)清除能力和超氧阴离子自由基(O2- ·)清除能力。结果表明:酸法提取菜籽多糖具有一定的清除 ·OH、DPPH自由基的能力及还原能力,而且其抗氧化能力与多糖的质量浓度成正相关性;其中,当多糖质量浓度为2mg/mL时,DPPH自由基清除能力能达到49.9%;当多糖质量浓度为4mg/mL时, ·OH的清除能力能达到30.4%;但其对于O2- ·几乎没有清除作用。

关键词: 菜籽多糖, 酸法提取, 抗氧化性

Abstract: In this study the stability of epigallocatechin gallate (EGCG) in a weakly acidic environment alone and in combination with an ultrasonic filed of 0.25 W/cm2 and 135 kHz was quantitatively analysis by high performance liquid chromatography. It was shown that under 20 ℃ and the same pH conditions, ultrasonic treatment caused a decrease of the stability of EGCG, and the loss rate of EGCG was 10.70 %, after 40 min exposure to pH 6.2 with ultrasonic treatment, exhibiting a 5.63-fold increase compared to the absence of ultrasonic. Linear regression indicated that the reaction of EGCG in an ultrasonic field and in a non-ultrasonic field followed first-order kinetics. The rate constant was 0.00228 min-1 in the presence of ultrasonic, the activation energy 22861.13 kJ/mol, and the pre-exponential factor 28.30 s-1, which were increased 4.3 times, decreased by 14.0% and increased by 13.5%, respectively.

Key words: epigallocatechin gallate, ultrasonic, stability, chemical dynamics, kinetic model

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