食品科学 ›› 2011, Vol. 32 ›› Issue (15): 46-48.doi: 10.7506/spkx1002-6630-201115011

• 基础研究 • 上一篇    下一篇

路边青多酚的稳定性及其热降解动力学

欧阳玉祝,李 勇,吴道宏,郭鸿彬   

  1. 吉首大学食品科学研究所
  • 出版日期:2011-08-15 发布日期:2011-07-26
  • 基金资助:
    植物资源保护与利用湖南省高校重点实验室开放基金项目(JSK201001);湖南省科技厅科技计划项目(2008FJ3077)

Stability and Thermal Degradation Kinetics of Polyphenols from the Whole plant of Geum japonicum Thunb variant

OUYANG Yu-zhu,LI Yong,WU Dao-hong,GUO Hong-bin   

  1. (Institute of Food Science, Jishou University, Jishou 416000, China)
  • Online:2011-08-15 Published:2011-07-26

摘要: 研究pH值和温度对路边青多酚的稳定性影响及其路边青多酚的热降解动力学特征。结果表明:多酚质量浓度随pH值增加而增加,随温度的升高而减小。多酚的热降解反应符合一级反应动力学模型,动力学曲线线性关系良好。30~70℃条件下热降解反应的速率常数分别为0.0096、0.0115、0.0153、0.0175h-1和0.02h-1,表观活化能为15.6952kJ/mol。

关键词: 路边青, 多酚, 稳定性, 热降解动力学

Abstract: In this paper, the effects of pH and temperature on the stability and thermal degradation kinetic characteristics of polyphenols from the whole plant of Geum japonicum Thunb variant were explored. Results indicated that the concentration of polyphenols was increased with increasing pH but decreased with increasing temperature. The thermal degradation of polyphenols from G.japonicum was a first-order kinetic model with an excellent linear relationship. The rate constants of thermal degradation reaction at 30, 40, 50, 60 ℃ and 70 ℃ were 0.0096, 0.0115, 0.0153, 0.0175 h-1 and 0.02 h-1, respectively. Its apparent activation energy was 15.6952 kJ/mol.

Key words: Geum japonicum Thunb variant, polyphenol, stability, thermal degradation kinetics

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