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

• Published in: Journal of thermal analysis and calorimetry Vol. 122; no. 1; pp. 207 - 214
• Main Authors: Correia, Lidiane P., Procópio, José V. V., Santana, Cleildo P., Pinto, Márcia F., Moura, Elisana A., Santos, Ana F. O., Macêdo, Rui O.
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01-10-2015; Springer
• Subjects: Activation energy; Analytical Chemistry; Chemistry; Chemistry and Materials Science; Inorganic Chemistry; Measurement Science and Instrumentation; Medicine, Botanic; Medicine, Herbal; Methods; Physical Chemistry; Polymer Sciences; Powders; Herbal medicine; Ozawa model; Particle size; TG
• ISSN: 1388-6150; 1588-2926
• DOI: 10.1007/s10973-015-4638-5

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.