Comportamiento higroscópico del polvo de Araçá-boi (Eugenia Stipitata) obtenido por el método de liofilización con diferentes concentraciones de maltodextrina
DOI:
https://doi.org/10.33448/rsd-v10i9.16515Palabras clave:
Eugenia stipitata; Isotermas; Modelos matemáticos; Actividad del agua; Estabilidad microbiológica.Resumen
This study aimed to evaluate the physicochemical characteristics of freeze-dried Araçá-boi powder, and its hygroscopic behavior using adsorption isotherms and different mathematical models. The Araçá-boi pulp formulations with different concentrations of maltodextrin (14, 21 and 28%) were frozen in a freezer at -18 ° C, then dehydrated in a bench-top freeze dryer. The parameters of water content, total solids, pH and titratable acidity were determined. The water adsorption isotherms of Araçá-boi powder at temperatures of 25, 30 and 35 °C were determined using the special indirect static method, using the Aqualab hygrometer, to measure water activity. The Henderson, Oswin, Halsey, GAB and Peleg models were fitted to the water adsorption isotherms using nonlinear regression. From the coefficient of determination (R2) and the mean percentage deviation (P), it was found that, among the models studied and considering the temperatures tested, the R2 values obtained in GAB, Halsey and Peleg are so close to each other that , in the worst case, they do not exceed a 0.9% difference. The best mathematical representation of the isotherms was obtained by the GAB model, since it presented the lowest values for Xm, being, therefore, the model that best explains the water gain.
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Derechos de autor 2021 Romário Oliveira de Andrade ; Nadson Libio Bezerra Ferreira; Gustavo Santos de Lima; Ana Raquel Carmo de Lima; Caio Franklin Vieira de Figueiredo; Eduardo Henrique Santos de Lima; Saul Ramos de Oliveira; Edilayane da Nóbrega Santos; Josivanda Palmeira Gomes; Ana Paula Trindade Rocha; Gilsandro Alves da Costa; Anderson Ferreira Vilela
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