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vol.9 issue1EFFECT OF TEMPERATURE AND SPEED OF THE HANGING LINE ON THE PERCENTAGE OF FEATHER AND DEPIGMENTATION OF WHITE AND PEN CHICKENS, DURING THE SCALDING PROCESSADSORPTION ISOTHERMS AND ISOSTERIC HEAT ESTIMATION IN CASSAVA FLOUR author indexsubject indexarticles search
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Biotecnología en el Sector Agropecuario y Agroindustrial

Print version ISSN 1692-3561

Abstract

NAVIA, DIANA P; AYALA A, ALFREDO  and  VILLADA, HÉCTOR S. ADSORPTION ISOTHERMS OF CASSAVA FLOUR BIOPLASTICS COMPRESSION MOLDED. Rev.Bio.Agro [online]. 2011, vol.9, n.1, pp.77-87. ISSN 1692-3561.

Water adsorption and isosteric heat were evaluated in biopolymers made from flour of two varieties of cassava (CM 7951-5 and MBRA 383), fique dust and glycerol by compression molding technique. The adsorption isotherms of polymeric samples were performed at 15,25, and 35°C in a water activity range of 0.12 to 0.98, using a gravimetric method. The adsorption experimental data were adjusted using the GAB, Caurie, Oswin, Smith, Henderson and Peleg models. The sorption isosteric heat (Qst) was determined with Clausius-Clapeyron equation. The results showed that the Peleg model was adjusted appropriately to experimental values of adsorption at 15, 25 and 35°C in the samples prepared with the variety CM 7951-5 and 15 and 25°C for the variety MBRA 383, while the GAB model was at 35°C for MBRA 383. Isosteric heat of sorption decreased with increase in equilibrium moisture content finding the maximum in 87Kj/mol and 78 Kj/mol, and minimum in 44.6 Kj/mol and 44.5 Kj/mol in samples made with CM 7951-5y MBRA 383 respectively.

Keywords : Adsorption; Compression molding; Cassava; Biopolymers.

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