食品科学 ›› 2007, Vol. 28 ›› Issue (12): 112-116.

• 基础研究 • 上一篇    下一篇

离子交换树脂分离碱性溶液中橙皮苷的动力学和热力学

 朱思明, 于淑娟, 扶雄, 杨连生   

  1. 华南理工大学轻工与食品学院; 华南理工大学轻工与食品学院 广东广州510640; 广东广州510640;
  • 出版日期:2007-12-15 发布日期:2011-11-22

Kinetics and Thermodynamics of Adsorption of Hesperidin in Alkaline Solution on Ion-exchange Resin

 ZHU  Si-Ming, YU  Shu-Juan, FU  Xiong, YANG  Lian-Sheng   

  1. College of Light Chemistry and Food Science, South China University of Technology, Guangzhou 510640, China
  • Online:2007-12-15 Published:2011-11-22

摘要: 橙皮苷是有着许多生理活性的生物类黄酮。本研究通过静态吸附实验,对D296树脂分离碱性水溶液中高浓度橙皮苷的工艺条件、吸附性能、反应动力学和热力学进行了探讨。结果表明,pH为11.5、浓度为2.43g/L的橙皮苷水溶液适于用小粒径的D296树脂在60℃下浓缩;吸附过程符合Freundish等温吸附式;60℃时树脂与橙皮苷反应的速率常数k为0.5167h-1,且随温度的降低而降低,反应活化能Ea为23.45kJ/mol;在60℃反应平衡时,吸附过程的表观交换反应平衡常数Ke、自由能变化ΔG0、反应热ΔHm0和熵值ΔS0分别为7336.15g2/L2、-24.63kJ/mol,69.69kJ/mol和0.28kJ/mol。因此,交换反应能自发进行,是吸热和熵增加的反应。

关键词: 橙皮苷, 离子交换树脂, 吸附, 动力学, 热力学

Abstract: Hesperidin is a bioflavonoid with many biological activities. The adsorption conditions, exchange reaction behavior, reaction kinetics and thermodynamics were investigated by batch ion-exchange method. The results showed that the optimum adsorption condition is at 60 ℃, pH 11.5 and hesperidin concentration 2.43 mg/ml, and the resin with little diameter is adaptableto adsorb hesperidin because of its large specific surface area. The adsorption process in solution exhibits Freundish behaviour. In addition, the exchange rate constant at 60 ℃ is 0.5167 h-1, which decreases as the temperature decreases, and the exchange activation energy Ea is 23.45 kJ/mol. Furthermore, the apparent equilibrium constant Ke of D296 for hesperidin is 7336.15 g2/L2. So the exchange reactions can occur spontaneously forΔG0 -24.63kJ/mol, greater than zero. Then the reaction enthalpy ΔHm0 is 69.69 kJ/mol, indicating the reaction endothermic. And the entropy increases during the reaction for ΔS0 0.28 kJ/mol, greater than zero.

Key words: hesperidin, ion-exchange resin, adsorption, kinetics, thermodynamics