Browsing by Author "Miranda, Margarita"
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- ItemCHARACTERISTICS AND MATHEMATICAL MODELING OF CONVECTIVE DRYING OF QUINOA (CHENOPODIUM QUINOA WILLD.): INFLUENCE OF TEMPERATURE ON THE KINETIC PARAMETERS(WILEY, 2010) Vega Galvez, Antonio; San Martin, Ricardo; Sanders, Mariela; Miranda, Margarita; Lara, ElenaThe aim of this research was to model the drying kinetics of quinoa and to evaluate the temperature influence on the kinetic parameters of the models used. Prior to drying process, quinoa grains were washed at 60C and the removal of saponins was studied. Hot air drying temperatures were 40, 50, 60, 70 and 80C. Initial saponin content was 6.34%, reaching a final saponin content of 0.25% after 120 min of washing. Sorption isotherm was determined at 60C giving a monolayer moisture content of 0.051 g water/g dry matter. Drying kinetics was modeled with different equations. Diffusional coefficient increased with temperature from 3.78 to 7.67 x 10-11 m2/s, for a range of temperatures between 40 and 80C, with an estimated of E-a 15.95 kJ/mol. According to the statistical tests used, the logarithmic and Weibull models gave the best fit for experimental data (determination coefficient > 0.98, sum squared error < 0.001 and Chi-square < 0.001).
- ItemEffect of high hydrostatic pressure on functional properties and quality characteristics of Aloe vera gel (Aloe barbadensis Miller)(2011) Vega-Galvez, Antonio; Miranda, Margarita; Aranda Bustos, Mario Antonio; Henriquez, Karem; Vergara, Judith; Tabilo-Munizaga, Gipsy; Perez-Won, Mario
- ItemImpact of air-drying temperature on nutritional properties, total phenolic content and antioxidant capacity of quinoa seeds (Chenopodium quinoa Willd.)(2010) Miranda, Margarita; Vega-Galvez, Antonio; Lopez, Jessica; Parada, Gloria; Sanders, Mariela; Aranda Bustos, Mario Antonio; Uribe, Elsa; Di Scala, Karina