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Effect of drying methods on the thermodynamic properties of blackberry pulp powder

GIRALDO GÓMEZ, GLORIA I. and ORREGO-ALZATE, CARLOS E. and GRAJALES, LINA M. and TELIS, VÂNIA R.N. and GABAS, ANA L. and TELIS-ROMERO, JAVIER (2011) Effect of drying methods on the thermodynamic properties of blackberry pulp powder. Dyna; Vol. 78, núm. 168 (2011); 139-148 DYNA; Vol. 78, núm. 168 (2011); 139-148 2346-2183 0012-7353 .

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Three different types of maltodextrin encapsulated dehydrated blackberry fruit powders were obtained using vibrofluidized bed drying (VF), spray drying (SD), vacuum drying (VD), and freeze drying (FD). Moisture equilibrium data of blackberry pulp powders with 18% maltodextrin were determined at 20, 30, 40, and 50°C using the static gravimetric method for the water activity range of 0.06–0.90. Experimental equilibrium moisture content data versus water activity were fit to the Guggenheim–Anderson–de Boer (GAB) model. Agreement was found between experimental and calculated values. The isosteric heat of sorption of water was determined using the Clausius–Clapeyron equation from the equilibrium data; isosteric heats of sorption were found to increase with increasing temperature and could be adjusted by an exponential relationship. For freeze dried, vibrofluidized, and vacuum dried pulp powder samples, the isosteric heats of sorption were lower (more negative) than those calculated for spray dried samples. The enthalpy-entropy compensation theory was applied to sorption isotherms and plots of ΔH versus ΔS provided the isokinetic temperatures, indicating an enthalpy-controlled sorption process.

Tipo de documento:Artículo - Article
Información adicional:Derechos de autor reservados
Palabras clave:Fruit pulp, drying methods, water activity, isotherms, thermodynamic properties
Unidad administrativa:Revistas electrónicas UN > Dyna
Código ID:28087
Enviado por : Dirección Nacional de Bibliotecas STECNICO
Enviado el día :27 Junio 2014 19:16
Ultima modificación:18 Agosto 2014 18:14
Ultima modificación:18 Agosto 2014 18:14
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