Aproveitamento de polpa e resíduos de jaca (Artocarpus heterophyllus Lam.) através de secagem conectiva.

Abstract

The objective of this paper is the drying process implementation for pulp and jackfruit waste items {Artocarpus heterophyllus Lam.) for a possible application in the industry.The relationship between moisture content and water activity provides useful information for processing and storage of jackfruit wastes. The desorption isotherms for pulp, peel, mesocarp, central axis and seeds of jackfruit were determined at four different temperatures (40, 50, 60 and 70 °C) over wide ranges of moisture content (0,001-0,278 kg-kg"' and water activity (0,02-0,753). The theoretical model of GAB and the empirical models of Oswin, Halsey, Henderson and Iglesias-Chirife were used to modeling the desorption isotherms. The analytical solution of the Clausius-Clapeyron equation was proposed to compute the isosteric heat of sorption and the differential entropy, for peel, mesocarp and pulp of jackfruit, by means of the GAB and Oswin models when the effect of temperature on hygroscopic equilibrium was considered. Drying kinetics for peel, pulp and seeds of jackfruit in convective hot air forced equipment were determined, at three air velocities (0,7; 1,4 and 1.8 nvs"1) and four temperatures (40, 50, 60 and 70 °C).In the graphical analysis, a falling rate period was found for all experimental curves. Finally, with the information obtained in the drying process, products were formulated with the pulp and others jackfruit items, which were characterized via chemical, nutritional, sensory and microbiological.