Adsorption Studies of Radish Leaf Powder

Abstract

Abstract-Radish leaves (Raphanus sativus) powder fractions was subjected to moisture adsorption isotherms at different isothermal temperature conditions from 15-45 o C with an equal interval of 10 o C. The sorption data obtained in gravimetric static method under 0.11-0.90 water activity conditions were subjected for sorption isotherms and found to be typical sigmoid trend. Experimental data were assessed for the applicability in the prediction through sorption models fitting and found that Polynomial and GAB equations performed well over all fitted models in describing equilibrium moisture content -equilibrium relative humidity (EMC-ERH) relationships for shelf stable dehydrated radish leaf powder, over the entire range of temperatures condition under study. The net isosteric heat of sorption, differential entropy and free energy were determined at different temperatures and their dependence was seen with respect to equilibrium moisture content.