Thermal Characterization and Decomposition Kinetics of Free Anthraquinones from Rhubarb

作     者：Li Ming ZHANG Xia LI Yu Jie DAI 

作者机构：College of Bioengineering Tianjin University of Science ＆ Technology Tianjin 300222 

出 版 物：《Chinese Chemical Letters》 (中国化学快报（英文版）)

年 卷 期：2006年第17卷第5期

页      面：699-702页

核心收录：

学科分类：1008[医学-中药学(可授医学、理学学位)] 1007[医学-药学(可授医学、理学学位)] 1006[医学-中西医结合] 0703[理学-化学] 100602[医学-中西医结合临床] 10[医学] 

基　　金：The Science and Technology Development Fund of Tientsin Universities(20031210) 

主　　题：Aloe-emodin chrysophanol physcion thermogravimetry (TG) differential thermoanalysis (DTA) non-isothermal kinetics. 

摘      要：The thermal behaviour of aloe-emodin, chrysophanol and physcion and their kinetics have been investigated under non-isothermal conditions by means of differential thermal analysis （DTA） and thermogravimetry （TG）. The thermal characteristics have been determined using the DTA and TG-DTG curves. The non-isothermal kinetic data were analyzed by means of the Achar method and the Madhusudanan-Krishnan-Ninan （MKN） method. The possible reaction mechanisms have been investigated by comparing the kinetic parameters. The kinetic equation for aloe-emodin, chrysophanol and physcion can be expressed as dα/dt=Aexp（-E/RT）1/3（1-α）[-In（1-α]2. The activation energy E （kJ mol^-1） of the three free anthraquinones are 78.09, 89.54, and 107.5 and their InA/s^-1 are 22.98, 36.85 and 43.60, respectively.