Browsing by Author "Vera Cabezas, Luisa Mayra"

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Modelamiento cinético de la extracción sólido-líquido de capsaicina, cinamaldehído y timol en ají habanero, canela y tomillo
(Universidad de Cuenca. Facultad de Ciencias Químicas, 2026-02-18) Arias Cárdenas, Galo Santiago; Terán Cordero, Iván Alexander; Vera Cabezas, Luisa Mayra
The solid-liquid extraction of bioactive compounds of plant origin is a process of great relevance in industries such as food, pharmaceuticals and agriculture. However, their use is limited by the poor understanding of the processes that influence extraction kinetics. In the present research, the behavior of the extraction of capsaicin, thymol and cinnamaldehyde from habanero pepper, thyme and cinnamon leaves respectively, was studied by controlled thermal agitation at 20, 40 and 60 °C. The quantification of the compounds was carried out through UV-Visible spectroscopy, while the structure of the matrices was characterized by stereomicroscopy and atomic force microscopy, relating porosity and roughness with extraction efficiency. The experimental data were fitted to the first-order, pseudo-second- order, Peleg and intraparticle diffusion models, and the effect of temperature was evaluated using the Arrhenius equation. The results showed that capsaicin and thymol have higher extraction rates due to the higher porosity of their matrices, while cinnamaldehyde presented a slower release associated with the compact structure of cinnamon leaves. The fit of the kinetic models showed that capsaicin is best described by diffusion at low and medium temperatures and by pseudo-second order and Peleg at high temperatures, thymol is mainly fitted to the pseudo-second order and Peleg models, while cinnamaldehyde is best described by the intraparticle diffusion model. These results allow us to understand the mechanisms of metabolite release and provide criteria for the optimization of extractive processes.