Modeling yerba mate aqueous extraction kinetics: Influence of temperature

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A new kinetics model, a combined second-order-diffusional kinetics model, was developed and compared with a pseudo first-order model for the aqueous extraction of total water soluble solids (WSS) from yerba mate leaves. The model that coupled two mechanisms fits the experimental data more satisfacto...

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Detalles Bibliográficos
Autores principales: Linares, A.R., Hase, S.L., Vergara, M.L., Resnik, S.L.
Formato: JOUR
Materias:
Activation energy
Aqueous extraction
Kinetics modeling
Yerba mate
Concentration of
Different mechanisms
Equilibrium concentration
Experimental data
Extraction yield
First-order models
Kinetics models
Kinetics parameter
Second orders
Temperature range
Watersoluble
Yerba mate leaves
Solvent extraction
Croton ovalifolius
Ilex paraguariensis
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_02608774_v97_n4_p471_Linares
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
Descripción
Sumario:A new kinetics model, a combined second-order-diffusional kinetics model, was developed and compared with a pseudo first-order model for the aqueous extraction of total water soluble solids (WSS) from yerba mate leaves. The model that coupled two mechanisms fits the experimental data more satisfactorily (E% = 1.2 to 2.2) than the pseudo first-order model (E% = 3.9 to 4.4). The second-order-diffusional model could explain the first seconds of the WSS extraction and how the different mechanisms contributed to the concentration of the extract. Temperature influenced the kinetics parameters, but the equilibrium concentrations and the extraction yield were not significantly influenced in a temperature range between 40 and 70 °C. © 2009 Elsevier Ltd. All rights reserved.

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