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Información tecnológica

On-line version ISSN 0718-0764

Abstract

GASPARETO, O.C.P.; OLIVEIRA, E.L.; DA SILVA, P.D. L.  and  MAGALHAES, M.M.A.. Influence of Osmotic Treatment onthe Drying of "Nanica" Bananas (Musa cavendishii, L.) in a Fixed Bed Dryer. Inf. tecnol. [online]. 2004, vol.15, n.6, pp.9-16. ISSN 0718-0764.  http://dx.doi.org/10.4067/S0718-07642004000600002.

The influence of sugar concentrations (50 and 70 °Brix) and temperature (50 and 70 oC) on the osmotic dehydration of "Nanica" Bananas  (Musa cavendishii, L.), have been studied. For supplementary drying, a fixed bed drier was used at 60 oC with an air flow of 2.0 m/s. The kinetic behavior of the process was verified during drying using experimental data on the periods of decreasing velocities to obtain curves of drying speed vs humidity.  Effective diffusivities were calculated based on a diffusion model for 50 oBrix/50 oC, 50 oBrix/70 oC, 70 oBrix/50 oC and 70 oBrix/70 oC, with respective results of 9.12x10-10, 9.46x10-10, 1.01x10-09 and 1.05x10-09 m2/s. It was observed that the effective diffusivities were neither influenced by the sugar concentration nor by the temperature. The best condition of humidity loss and sugar gain was at 70 oBrix/50o C.

Keywords : osmotic dehydration; banana drying; effective diffusivities; fixed bed dryer.

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