MEASURING AND MODELING THE WATER-VAPOR DESORPTION IN SUNFLOWER SEED

Authors
ROVEDO CO AGUERRE RJ SUAREZ C
Citation
Co. Rovedo et al., MEASURING AND MODELING THE WATER-VAPOR DESORPTION IN SUNFLOWER SEED, International journal of food science & technology, 28(2), 1993, pp. 153-158
Citations number
12
Categorie Soggetti
Food Science & Tenology
Journal title
International journal of food science & technology → ACNP
ISSN journal
09505423
Volume
28
Issue
2
Year of publication
1993
Pages
153 - 158
Database
ISI
SICI code
0950-5423(1993)28:2<153:MAMTWD>2.0.ZU;2-P
Abstract
Water activities of sunflower seed (whole), hull and endosperm were me asured at 25, 40 and 50-degrees-C and different moisture contents by m eans of an electronic a(w)-meter in the range 0.199-0.867. Based on th e equilibrium between the water in air and a constant moisture specime n, the method permits a direct measurement of the isosteres and was us ed to estimate the variation of the isosteric heat with moisture conte nt. In the range of temperature investigated it was found that the iso steric heat is pracitically independent of temperature. The hygroscopi c equilibrium data of the different materials were modelled by a BET-t ype two parameter isotherm for the whole range of water activity inves tigated.