RT Journal Article
T1 Water adsorption isotherms of carboxymethyl cellulose, guar, locust bean, tragacanth and xanthan gums
A1 Torres Pérez, María Dolores
A1 Moreira Martínez, Ramón Felipe
A1 Chenlo Romero, Francisco
A1 Vázquez, María J.
K1 Water activity
K1 Thermodynamics
K1 Storage conditions
K1 GAB model
AB Water adsorption isotherms of carboxymethyl cellulose (CMC), guar gum (GG), locust bean gum (LBG), tragacanth gum (TG) and xanthan gum (XG) were determined at different temperatures (20, 35, 50, and 65 °C) using a gravimetric method. Several saturated salt solutions were selected to obtain different water activities in the range from 0.09 to 0.91. Water adsorption isotherms of tested hydrocolloids were classified like type II isotherms. In all cases, equilibrium moisture content decreased with increasing temperature at each water activity value. Three-parameter Guggenheim–Anderson–de Boer (GAB) model was employed to fit the experimental data in the water activity range and statistical analysis indicated that this model gave satisfactory results. CMC and GG were the most and the least hygroscopic gums, respectively. Sorption heats decreased with increasing moisture content. Monolayer moisture content evaluated with GAB model was consistent with equilibrium conditions of maximum stability calculated from thermodynamic analysis of net integral entropy. Values of equilibrium relative humidity at 20 °C are proposed to storage adequately the tested gums.
PB Elsevier
SN 0144-8617
YR 2012
FD 2012-06-20
LK https://hdl.handle.net/10347/44966
UL https://hdl.handle.net/10347/44966
LA eng
NO Torres, M. D., Moreira, R., Chenlo, F., & Vázquez, M. J. (2012). Water adsorption isotherms of carboxymethyl cellulose, guar, locust bean, tragacanth and xanthan gums. “Carbohydrate Polymers”, 89(2), 592-598. https://doi.org/10.1016/j.carbpol.2012.03.055
NO The authors acknowledge the financial support to Ministerio de Educación y Ciencia of Spain and FEDER (CTQ2010-15309). M.D. Torres gratefully acknowledges the Ministerio de Educación y Ciencia of Spain for her FPU grant (AP 2007-04397).
DS Minerva
RD 25 abr 2026