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Thermal analysis during partial carbonizing process of rhubarb, moutan and burnet

Control of temperature and duration of partial carbonization for Chinese medicines have been mainly based on experience of the processors. No quantitative methods and parameters are available that can be used to precisely control the temperature and determine the energy changes during the process. I...

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Autores principales: Ma, Junnan, Meng, Xianglong, Guo, Xiaohui, Lan, Yaru, Zhang, Shuosheng
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5360265/
https://www.ncbi.nlm.nih.gov/pubmed/28323877
http://dx.doi.org/10.1371/journal.pone.0173946
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author Ma, Junnan
Meng, Xianglong
Guo, Xiaohui
Lan, Yaru
Zhang, Shuosheng
author_facet Ma, Junnan
Meng, Xianglong
Guo, Xiaohui
Lan, Yaru
Zhang, Shuosheng
author_sort Ma, Junnan
collection PubMed
description Control of temperature and duration of partial carbonization for Chinese medicines have been mainly based on experience of the processors. No quantitative methods and parameters are available that can be used to precisely control the temperature and determine the energy changes during the process. In our research, with a simulated atmosphere air condition, the partial carbonization processes of three Chinese herb medicines rhubarb, moutan and burnet were simulated at different heating rates (5, 10 and 20°C • min(-1)) and analyzed by thermal gravimetric analysis (TGA) to quantify the upper limits of the temperature. The activation energy was calculated with Friedman, Kissinger-Akahira-Sunose (KAS) method and Ozawa-Flynn-Wall (OFW) methods in iso-conversional models and independent parallel reaction model (IPR). The upper temperatures were calculated to be 280, 184 and 246°C for rhubarb, moutan and burnet, respectively, at corresponding conversion rates of 0.4, 0.2 and 0.1. Calculation of the activation energy has been found impossible with the IPR model. Results obtained from the three iso-conversional methods were different. For rhubarb and burnet, the conversion rates at the upper temperature limits were at the highest or second highest activation energy, while for moutan, it was at the lowest value of activation energy. These results confirmed scientific rationales of traditional Chinese medicine theory that rhubarb and burnet be prepared at high temperature and moutan be prepared at medium temperature. Application of thermal analysis techniques would broaden and deepen traditional Chinese medicine research, and are applicable to the processing of medicinal materials including traditional Chinese medicines. Results obtained from the study could provide new ideas and methods for research to modernize the preparation of traditional Chinese medicines.
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spelling pubmed-53602652017-04-06 Thermal analysis during partial carbonizing process of rhubarb, moutan and burnet Ma, Junnan Meng, Xianglong Guo, Xiaohui Lan, Yaru Zhang, Shuosheng PLoS One Research Article Control of temperature and duration of partial carbonization for Chinese medicines have been mainly based on experience of the processors. No quantitative methods and parameters are available that can be used to precisely control the temperature and determine the energy changes during the process. In our research, with a simulated atmosphere air condition, the partial carbonization processes of three Chinese herb medicines rhubarb, moutan and burnet were simulated at different heating rates (5, 10 and 20°C • min(-1)) and analyzed by thermal gravimetric analysis (TGA) to quantify the upper limits of the temperature. The activation energy was calculated with Friedman, Kissinger-Akahira-Sunose (KAS) method and Ozawa-Flynn-Wall (OFW) methods in iso-conversional models and independent parallel reaction model (IPR). The upper temperatures were calculated to be 280, 184 and 246°C for rhubarb, moutan and burnet, respectively, at corresponding conversion rates of 0.4, 0.2 and 0.1. Calculation of the activation energy has been found impossible with the IPR model. Results obtained from the three iso-conversional methods were different. For rhubarb and burnet, the conversion rates at the upper temperature limits were at the highest or second highest activation energy, while for moutan, it was at the lowest value of activation energy. These results confirmed scientific rationales of traditional Chinese medicine theory that rhubarb and burnet be prepared at high temperature and moutan be prepared at medium temperature. Application of thermal analysis techniques would broaden and deepen traditional Chinese medicine research, and are applicable to the processing of medicinal materials including traditional Chinese medicines. Results obtained from the study could provide new ideas and methods for research to modernize the preparation of traditional Chinese medicines. Public Library of Science 2017-03-21 /pmc/articles/PMC5360265/ /pubmed/28323877 http://dx.doi.org/10.1371/journal.pone.0173946 Text en © 2017 Ma et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Ma, Junnan
Meng, Xianglong
Guo, Xiaohui
Lan, Yaru
Zhang, Shuosheng
Thermal analysis during partial carbonizing process of rhubarb, moutan and burnet
title Thermal analysis during partial carbonizing process of rhubarb, moutan and burnet
title_full Thermal analysis during partial carbonizing process of rhubarb, moutan and burnet
title_fullStr Thermal analysis during partial carbonizing process of rhubarb, moutan and burnet
title_full_unstemmed Thermal analysis during partial carbonizing process of rhubarb, moutan and burnet
title_short Thermal analysis during partial carbonizing process of rhubarb, moutan and burnet
title_sort thermal analysis during partial carbonizing process of rhubarb, moutan and burnet
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5360265/
https://www.ncbi.nlm.nih.gov/pubmed/28323877
http://dx.doi.org/10.1371/journal.pone.0173946
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