Mass transfer during osmotic dehydration of chestnut using sodium chloride solutions

摘要: Abstract Osmotic dehydration of chestnut ( Castanea sativa Mill.) was carried out using aqueous solutions sodium chloride different concentrations (17.0%, 22.0%, and 26.5% w/w) as osmotic media, working at three temperatures (25, 35, 45 °C). At time intervals (up to 8 h) contact with the total mass, solids gain, water loss, moisture content were determined. The experimental data modelling achieved employing an empirical model based on logistic dose response (LDR) curves also a diffusional considering constant value coefficient diffusion without shrinkage. same operating conditions, contents obtained for depths samples determine composition profiles during dehydration. A quality parameter, colour, determined each sample. analysis results allow conclude that mass transfer rates are slower than in other products effect operation temperature is not relevant enhance mass. LDR fits successfully allows estimating equilibrium several characteristic parameters process. consideration gives satisfactory results, but taking into account penetration agent product it adequate all (overcoat long periods where penetrations front more intensive). WL/SG reveal optimal values, range conditions assayed, when low (25 °C) 22.0% (w/w) concentration media employed.