MODELLING OF DESORPTION ISOTHERMS OF CHESTNUT: INFLUENCE OF TEMPERATURE AND EVALUATION OF ISOSTERIC HEATS
- 30 June 2001
- journal article
- Published by Taylor & Francis Ltd in Drying Technology
- Vol. 19 (6), 1189-1199
- https://doi.org/10.1081/drt-100104814
Abstract
The desorption isotherms of chestnuts (Castanea sativa Mill) were determined at 278, 293, 303, 313, and 323K by a gravimetric technique. The range of water activity was from 0.08 at 0.91. The sorption isotherms were of the type II according to Brunauer's classification. The effect of the temperature shows a cross over of the desorption isotherms at water activity 0.6. The experimental data are fitted with several models (Oswin, Smith, Henderson, Halsey, and G.A.B.). Oswin and G.A.B. models gave the best fittings. Particularly, with G.A.B. model parameters some interesting information as monolayer moisture content, heat of sorption of the first and nth layer adsorbed and net isosteric heat were obtained.Keywords
This publication has 13 references indexed in Scilit:
- Texture of Chinese water chestnut: Involvement of cell wall phenolicsJournal of the Science of Food and Agriculture, 1995
- Comparison of total lipids, fatty acids, sugars and nonvolatile organic acids in nuts from four Castanea speciesJournal of the Science of Food and Agriculture, 1994
- Moisture Sorption Isotherms of Dried Apricot, Fig and Raisin at 20 °C and 36°CJournal of Food Science, 1990
- Nutrient data on chestnuts consumed in the United StatesEconomic Botany, 1988
- Effect of Temperature on the Water Adsorption Isotherms of Sultana RaisinsJournal of Food Science, 1986
- Humidity fixed points of binary saturated aqueous solutionsJournal of Research of the National Bureau of Standards Section A: Physics and Chemistry, 1977
- Prediction of the effect of temperature on water sorption isotherms of food materialInternational Journal of Food Science & Technology, 1976
- Adsorption and Desorption of Water Vapor by Cereal Grains and Their Products Part I: Heat and Free Energy Changes of Adsorption and DesorptionTransactions of the ASAE, 1967
- Physical Adsorption on Non-Uniform SurfacesThe Journal of Chemical Physics, 1948
- The kinetics of package life. III. The isothermJournal of the Society of Chemical Industry, 1946