Citation: Li Ming ZHANG, Xia LI, Yu Jie DAI. Thermal Characterization and Decomposition Kinetics of Free Anthraquinones from Rhubarb[J]. Chinese Chemical Letters, ;2006, 17(5): 699-702. shu

Thermal Characterization and Decomposition Kinetics of Free Anthraquinones from Rhubarb

College of Bioengineering, Tianjin University of Science & Technology, Tianjin 300222

Received Date: 25 October 2005

Fund Project: This work was financially supported by the Science and Technology Development Fund of Tientsin Universities (No. 20031210).

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