SORPTION ISOTHERMS AND NET ISOSTERIC HEAT OF SORPTION FOR PLUM OSMOTICALLY PRE-TREATED WITH TREHALOSE AND SUCROSE SOLUTIONS

F. Daglioglu, T. Aktas, F. H. Sahin, P. Ulger

Abstract: Net isosteric heat of sorption can be used to determine the energy requirements of drying processes. Trehalose pre-treatments have better effects on some quality properties such as colour, shrinkage and cell reconstruction of dried agricultural materials. In this study, changing of moisture sorption isotherms and net isosteric heat of sorption for plum were determined at 30, 40, 50, 60°C. Sorption isotherms were determined using standard static gravimetric method. The net isosteric heat was determined by the application of the Clausius-Clapeyron equation to obtained sorption isotherms. Plum samples were pretreated osmotically with trehalose and sucrose solutions with 20 and 50 Brix concentrations.

Keywords: net isosteric heat; osmotic treatment; plum; sorption isotherms

Date published: 2019-04-19