Pyrolysis characteristics of Radix Rhizoma Rhei, Cortex Moudan Radicis, and Radix Sanguisorbae and correlations with the carbonizing process of Chinese herbs  

作　　者：MENG Xiang-Long GUO Xiao-Hui CUI Nan-Nan MA Jun-Nan ZHANG Shuo-Sheng FAN Zhou 

机构地区：[1]Shanxi University of Traditional Chinese Medicine [2]Institute of Coal Chemistry ,Chinese Academy of Sciences, Key Laboratory of Carbon Material [3]Hubei University of Traditional Chinese Medicine

出　　处：《Chinese Journal of Natural Medicines》2014年第1期55-64,共10页中国天然药物（英文版）

摘　　要：AIM： The aim of the work is to study the pyrolysis characteristics of Radix Rhizoma Rhei, Cortex Moudan Radicis, and Radix Sanguisorbae in an inert atmosphere of argon （Ar）, and to investigate the mechanism of the carbonizing process of the three traditional Chinese herbs. METHODS： The pyrolysis characteristics of the crude materials and their extracts were studied by thermogravimetry-mass spectrometry （TG-MS） in a carrier gas of argon, coupled with Fourier transform infrared spectrometry （FTIR） and scanning electron microscopy （SEM） methods. Correlation of the pyrolysis behaviors with the carbonizing process by stir-frying of traditional Chinese medicines was made. RESULTS： Within the temperature range of 200-300 ℃, which is the testing range for the study of the carbonizing process of Chinese herbs, the temperatures indicated by the maximum weight loss rate peak of the above three extracts were taken as the upper-limit temperatures of the carbonizing process of the herbs, and which were 200, 240 and 247 ℃ for Radix Rhizoma Rhei, Cortex Moudan Radicis, and Radix Sanguisorbae, respectively. The ion monitoring signal peaks detected by the TG-MS method corresponded with reports that the level of chemical components of traditional Chinese medicinal materials would decrease after the carbonizing process. It was confirmed by Fourier transform infrared spectrometry （FTIR） and scanning electron microscopy （SEM） methods that better results of ＂medicinal property preservation＂ could be obtained by heating at 200 ℃ for Radix Rhizoma Rhei, at about 250 ℃ for Cortex Moudan Radicis, and Radix Sanguisorbae, as the relative intensity values of the common peaks were among the middle of their three carbonized samples by programmed heating. CONCLUSION： The upper-limit temperatures of the carbonizing process for Radix Rhizoma Rhei, Cortex Moudan Radicis and Radix Sanguisorbae were 200, 240 and 247 ℃ respectively. It is feasible to research the mechanism and technology of the carbonizinAIM: The aim of the work is to study the pyrolysis characteristics of Radix Rhizoma Rhei, Cortex Moudan Radicis, and Radix Sanguisorbae in an inert atmosphere of argon(Ar), and to investigate the mechanism of the carbonizing process of the three traditional Chinese herbs. METHODS: The pyrolysis characteristics of the crude materials and their extracts were studied by thermogravimetry-mass spectrometry(TG-MS) in a carrier gas of argon, coupled with Fourier transform infrared spectrometry(FTIR) and scanning electron microscopy(SEM) methods. Correlation of the pyrolysis behaviors with the carbonizing process by stir-frying of traditional Chinese medicines was made. RESULTS: Within the temperature range of 200-300 °C, which is the testing range for the study of the carbonizing process of Chinese herbs, the temperatures indicated by the maximum weight loss rate peak of the above three extracts were taken as the upper-limit temperatures of the carbonizing process of the herbs, and which were 200, 240 and 247 °C for Radix Rhizoma Rhei, Cortex Moudan Radicis, and Radix Sanguisorbae, respectively. The ion monitoring signal peaks detected by the TG-MS method corresponded with reports that the level of chemical components of traditional Chinese medicinal materials would decrease after the carbonizing process. It was confirmed by Fourier transform infrared spectrometry(FTIR) and scanning electron microscopy(SEM) methods that better results of "medicinal property preservation" could be obtained by heating at 200 °C for Radix Rhizoma Rhei, at about 250 °C for Cortex Moudan Radicis, and Radix Sanguisorbae, as the relative intensity values of the common peaks were among the middle of their three carbonized samples by programmed heating. CONCLUSION: The upper-limit temperatures of the carbonizing process for Radix Rhizoma Rhei, Cortex Moudan Radicis and Radix Sanguisorbae were 200, 240 and 247 °C respectively. It is feasible to research the mechanism and technology of the carbonizing process of traditional Chinese medicinal

关 键 词：Chinese materia medica Mechanism and technology of carbonizing process Thermogravimetry-mass spectrometry（TG-MS） Fourier transform infrared spectrometry （FTIR） Scanning electron microscopy （SEM） 

分 类 号：R283[医药卫生—中药学]