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Characteristics and kinetics analysis of Codonopsis pilosula pyrolysis

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Abstract

Eight kinds of Radix Codonopsis (RC) from different origins in China were selected as the experimental samples fort his study. Their pyrolysis processes were researched by the method of thermogravimetry analysis, in which the heating course was set in the ways of programming temperature from room temperature to 500 °C at different heating rates. Research results show that the process in the heating period of RC includes three stages: water loss, fast pyrolysis, and medium rate decomposition. For cultivated RC, the average initial decomposition temperature in the fast pyrolysis stage is 115 °C, whereas the peak temperature of the fast pyrolysis stage is changed from 189 to 225 °C, in which stage the alcohol-soluble substances are mainly decomposed. It is required to control the operational temperatures of drying and concocting processes according to initial decomposition temperature. Kissinger–Akahira–Sunose model can be used to describe the process mechanism of RC pyrolysis, and the kinetic analyses based on the fast pyrolysis stage thermogravimetric data show that the activation energies change from 141 to 207 kJ mol−1 for cultivated RC samples and 122 to 131 kJ mol−1for wild RC samples. The alcohol-soluble extract (ASE) content of wild RC samples is lower than that of cultivated RC samples; their thermal stability is also relatively poor.

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Acknowledgements

The authors gratefully acknowledge the financial supports of Shanxi Science and Technology Tackling Fund (20100311090).

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Authors and Affiliations

  1. Key Laboratory of Coal Science and Technology, Taiyuan University of Technology, Ministry of Education and Shanxi Province, No. 79 West Yingze Street, Taiyuan, 030024, Shanxi, China

    Yingli Wang, Yongquan Zuo & Liping Chang

  2. Physical Chemistry Teaching Group, Department of Traditional Chinese Pharmacology, Shanxi University of Traditional Chinese Medicine, No. 89 Jinci Road, Taiyuan, 030024, Shanxi, China

    Yingli Wang

  3. Institute of Chemical and Biological Technology, Taiyuan University of Science and Technology, No. 264 Jinci Road, Taiyuan, 030021, Shanxi, China

    YuYing Zhao

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  1. Yingli Wang
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Correspondence to Liping Chang.

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Wang, Y., Zhao, Y., Zuo, Y. et al. Characteristics and kinetics analysis of Codonopsis pilosula pyrolysis. J Therm Anal Calorim 111, 1939–1945 (2013). https://doi.org/10.1007/s10973-011-2090-8

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  • DOI: https://doi.org/10.1007/s10973-011-2090-8

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