DETERMINATION OF MOISTURE DESORPTION ENTHALPY OF MESQUITE GUM WITH DIFFERENTIAL SCANNING CALORIMETRY AND THERMOGRAVIMETRIC ANALYSIS

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Abstract
Moisture sorption isotherms were determined for mesquite gum at 25, 35 and 45 ° C. The water desorption enthalpy was calculated from the isotherms with the Clausius-Clapeyron equation, and additionally by both different scanning calorimetry and thermogravimetric analysis. The two calorimetric techniques showed greater degree of water binding al the product surface at the lower moisture contents. There was a decrease in desorption enthalpy when moisture conlenl was increased. Negative enthalpy values suggested an endothermic reaction probably attributed to biopotymer solution. Results indicated that calorimetric and thermogravimetric analyses are suitable physical methods to estimate isosteric heats of mesquite gum.