Abstract

Apples (variety Idared) were vertically cut into cylinders, 2.0 cm in diameter and 2.0 cm in height (five pieces from one apple). The samples were first dried using different drying methods and their adsorption isotherms were compared. In addition, the samples were subjected to osmotic dehydration (OD) under different conditions (sucrose concentration, 34°–63oB; temperature, 34°–66 °C and different times) followed by air drying (AD). The adsorption isotherms of these samples (OD-AD) were also evaluated. All the adsorption isotherms were evaluated at 20 °C, using the static-gravimetric method. Adsorption isotherms data were fitted to the GAB model and the isotherms were found to be affected by the drying method as well as the OD conditions. Changes in sorption curves of OD-AD apple cylinders as induced by OD variables were studied. Adsorption isotherms of OD-AD apples were generally shifted down with respect to control samples (AD, FD, and Oven) and with increasing solute concentration. The monolayer moisture content (Mm) of the OD-AD products was comparatively lower. Adsorption isotherm of OD-AD samples followed Type II isotherms unlike the conventionally dried samples.

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