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- Title
Kinetics study of norbixin’s first stage thermal decomposition, using dynamic method.
- Authors
Silva, Gerlania; Souza, A.; Botelho, J.; Silva, M.; Silva, T.
- Abstract
Cis-norbixin isomer obtained by hydrolysis of cis-bixin and isolated by solvent extraction from annatto seeds. The thermal decomposition data of the cis-norbixin samples were analyzed by thermogravimetric analysis at different heating rates in the 25–900°C temperature range. DSC curves showed that thermal decomposition reactions for cis-norbixin occurred in the solid phase. The kinetic parameters, such as activation energy and pre-exponential factor were determined using integral and approximate methods: Coats–Redfern, Madhusudanan, Horowitz–Metzger and Van Krevelen. F1 mechanism describes well the first stage of the thermal decomposition.
- Subjects
CAROTENOIDS; ACHIOTE; HYDROLYSIS; SOLVENT extraction; CHEMICAL decomposition; THERMOGRAVIMETRY
- Publication
Journal of Thermal Analysis & Calorimetry, 2007, Vol 87, Issue 3, p871
- ISSN
1388-6150
- Publication type
Article
- DOI
10.1007/s10973-006-8198-6