Data/hora: 15/06/2024 22:37:59

Provedor de dados: | 124
País: | Brazil
Título: | The effect of encapsulants on the heat of sorption in vacuum-dried cajá powder
Autores: | Gomes,Maron Stanley Silva Oliveira; Polachini,Tiago Carregari; Lopes Filho,José Francisco; Romero,Javier Telis.
Data: | 2019-12-01
Ano: | 2019
Palavras-chave: | Isotherms; Maltodextrin; Gum arabic Water activity.
Resumo: | ABSTRACT Equilibrium moisture data from the powdered pulp of Spondias mombin, L., both with and without additives - 58% maltodextrin (MD) or 58% gum arabic (GA) - were determined at 20, 30, 40 and 50 °C, using the static gravimetric method for a water activity range of 0.06 to 0.90. The resulting isotherms were sigmoidal and typical Type III, with the Guggenheim-Anderson-de-Boer model (GAB) adjusted to the experimental data for equilibrium moisture vs water activity. The addition of additives was shown to affect the isotherms in such a way that, for the same water activity, samples of CP+GA and CP+MD showed a lower equilibrium moisture content and were not affected by the variations in temperature. The isosteric heat of sorption for the cajá powder with additives was greater (less negative) than that of the cajá powder with no additives, suggesting that polar sites in the product without the addition of GA or MD are more active. An empirical exponential relationship can describe the dependence of the heat of sorption as a function of the moisture content of the material.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902019000400584
Editor: | Universidade Federal do Ceará
Relação: | 10.5935/1806-6690.20190069
Formato: | text/html
Fonte: | Revista Ciência Agronômica  v.50 n.4 2019
Fonte: | info:eu-repo/semantics/openAccess