【摘 要】
：
The thermal behaviour of aloe-emodin, chrysophanol and physcion and their kinetics have been investigated under non-isothermal conditions by means of differenti
【机 构】
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College of Bioengineering
【基金项目】
：
The Science and Technology Development Fund of Tientsin Universities
论文部分内容阅读
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 lnA/s-1 are 22.98, 36.85 and 43.60, respectively.
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