Moisture-Sorption Study of Dried Date Fruits (original) (raw)
The sorption properties of dried date fruits, Khalas and Handal varieties, were studied at 30оC over a range of water activity, 0.10-0.98. A static gravimetric method was adopted and five sorption models: Bradley, BET (Brunauer, Emmet and Teller), Oswin, Henderson, and GAB (Guggenheim, Anderson and de Boer) were used in the analysis. Both Bradley and Henderson models were suitable for the Khalas variety while Oswin and Bradley models better described the behavior of the Handal variety. Monolayer moisture contents (Mo) for the two date fruit varieties were calculated using both the BET and GAB equations and both varieties of date exhibited the BET type II pattern. The monolayer moisture contents for the two varieties were recommended as the least moisture required for stability of dried date fruits in storage.
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