Herbal medicine physical quality evaluation by thermal analysis using adapted Ozawa method

Autor:	Rui Oliveira Macêdo, Ana Flávia Oliveira Santos, Elisana Afonso de Moura, José Valdilânio Virgulino Procópio, Márcia Ferraz Pinto, Cleildo P. Santana, Lidiane Pinto Correia
Rok vydání:	2015
Předmět:	Thermogravimetry Order of reaction Chemistry Sample size determination Analytical chemistry Tangent Particle Particle size Derivative Physical and Theoretical Chemistry Condensed Matter Physics Thermal analysis
Zdroj:	Journal of Thermal Analysis and Calorimetry. 122:207-214
ISSN:	1588-2926 1388-6150
DOI:	10.1007/s10973-015-4638-5
Popis:	The aim of this study was to evaluate the physical quality of Tabebuia caraiba (Mart.) Bur. powder, separately in three batches of different particle sizes, through the adapted Ozawa method. The Ozawa model was used for thermogravimetry (TG) data analysis in dynamic synthetic air and nitrogen atmospheres in different heating rates (5, 10, 20 and 40 °C min−1). The software TA-50 was used to data treatment. Kinetic data showed different values of activation energy and same reaction order according to the particle powder sample size in a specific model (derivative or tangent) of data treatment. The difference factor (F 1) was used to compare the parallelism line of the samples constructed by Ozawa graphs. Different kinetic results discriminate the particles size of the samples. TG technique allowed discriminating different particle sizes of herbal medicine powder.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::75bf5a5327538815e62b822e5fb2d0a4 https://doi.org/10.1007/s10973-015-4638-5 Zobrazit plný text záznamu Plný text ve formátu PDF