食品科学

• 基础研究 • 上一篇    下一篇

热风干燥过程中榆叶叶黄素的降解动力学

樊金玲,胡云霞,张金迪,吴 佳,孙晓菲,朱文学,黄印冉   

  1. 1.河南科技大学食品与生物工程学院,河南 洛阳 471003;2.河北省林业科学研究院,河北 石家庄 050061
  • 出版日期:2014-06-15 发布日期:2014-07-03

Degradation Kinetics of Lutein in Elm Leaves during Hot Air Drying Process

FAN Jin-ling, HU Yun-xia, ZHANG Jin-di, WU Jia, SUN Xiao-fei, ZHU Wen-xue, HUANG Yin-ran   

  1. 1. College of Food and Bioengineering, Henan University of Science and Technology, Luoyang 471003, China;
    2. Hebei Province Forestry Academy of Science, Shijiazhuang 050061, China
  • Online:2014-06-15 Published:2014-07-03

摘要:

目的:研究热风干燥过程中榆叶叶黄素的降解动力学。方法:采用高效液相色谱法测定榆叶中叶黄素的含量,对叶黄素降解过程进行反应动力学方程拟合,求解降解动力学参数。结果:新鲜榆叶中叶黄素含量较高,为(397.5±27.5)μg/g鲜质量((1.414±0.105)mg/g干质量)。当风速为0.5 m/s,干燥温度为50、60、70 ℃时,榆叶中叶黄素的热降解符合一级反应动力学模型,半衰期分别为4.5、3.2、2.8 h;温度升高,降解反应速率增大;降解反应速率常数与干燥温度的关系符合Arrhenius公式,反应活化能为21.23 kJ/mol。结论:热风干燥榆叶时,采用较低的干燥温度有利于提高叶黄素保留率。

关键词: 榆叶, 叶黄素, 高效液相色谱法, 降解动力学

Abstract:

Purpose: This study aimed to determine the degradation kinetics of lutein in elm leaves during hot air drying
process at different drying temperatures. Methods: The content of lutein in elm leaves was determined by high performance
liquid chromatography (HPLC). The process of lutein degradation was fitted with a reaction kinetic equation and the
degradation kinetic parameters were resolved. Results: The content of lutein in elm leaves was (397.5 ± 27.5) μg/g fresh
weight (FW) or (1.414 ± 0.105) mg/g dry weight (DW). Analysis of kinetic data suggested a first-order reaction for the
degradation of lutein in elm leaves with the half-lives of 4.5, 3.2 and 2.8 h at 50, 60 and 70 ℃ , respectively. Increasing
temperatures from 50 to 70 ℃ enhanced the degradation of lutein during drying process. The temperature-dependent
degradation was adequately modeled on the Arrhenius equation. The activation energy value for the degradation of lutein in
elm leaves was 21.23 kJ/mol. Conclusion:Hot-air dried elm leaves at lower temperature can retain higher levels of lutein.

Key words: elm leaves, lutein, high performance liquid chromatography, degradation kinetics