Moisture sorption isotherms and isosteric heat of sorption of coffee in different processing levels.

The desorption isotherms and thermodynamic properties of coffee from different processing stages were obtained during the drying process of this product. The isotherms were determined by a static gravimetric method for various temperature and humidity conditions. Equilibrium moisture content (Me) data were correlated by several mathematical models and an artificial neural network (ANN) model. The Me for coffee fruits, pulped coffee and green coffee increased with an increase in the water activity (aw) at any particular temperature. At a constant aw, coffee fruits samples had higher Me than the remaining coffee samples. Based on statistical parameters, the ANN model, modified Henderson and GAB models were adequate to describe the sorption characteristics of the samples. Isosteric heat of sorption was evaluated by means of the Clausius?Clapeyron equation. It decreased with increasing moisture content. The coffee fruits had high isosteric heat of sorption than that pulped coffee and green coffee.

Bibliographic Details

Main Authors:	CORRÊA, P. C., GONELI, A. L. D., AFONSO JUNIOR, P. C., OLIVEIRA, G. H. H. de, VALENTE, D. S. M.
Other Authors:	PAULO C. CORRÊA, Universidade de Viçosa; ANDRÉ L. D. GONELI, Universidade de Viçosa; PAULO CESAR AFONSO JUNIOR, SAPC; GABRIEL H. H. DE OLIVEIRA, Universidade de Viçosa; DOMINGOS S. M. VALENTE, Universidade de Viçosa.
Format:	Artigo de periódico biblioteca
Language:	English eng
Published:	2011-03-11
Subjects:	Coffea arabica L., Artificial neural network model, Equilibrium moisture content, Isoteric heat, Mathematical modelling.,
Online Access:	http://www.alice.cnptia.embrapa.br/alice/handle/doc/880486
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