OSMOTIC DEHYDRATION OF PUMPKIN (Cucurbita moschata) IN SUCROSE AND SUCROSE-SALT SOLUTIONS. EFFECT OF SOLUTION COMPOSITION AND SAMPLE SIZE

  • Maria Florencia Kvapil
  • L.L. Chaillou
  • A.G. Qüesta
  • Rodolfo Mascheroni
Keywords: Anco pumpkin, Osmotic dehydration, Size, Sucrose, Sodium chloride

Abstract

Mass transfer during osmotic dehy-dration (OD) of pumpkin cubes was studied as a function of sample size and composition and con-centration of sucrose dehydrating solution. Models of Azuara and Hawkes & Flink were adjusted to the experimental data and optimal dehydrating conditions could be specified. For equal solutes concentration, higher weight losses were reached for smaller size samples. The addition of 2% NaCl increased Water Loss (WL) and lowered Solids Gain (SG) for the solution of higher sucrose con-tent. Prediction capacity of the simplified models was very good under the tested working conditions. In brief, OD can be optimized using 1 cm side cu-bes dehydrated in binary or ternary solutions at the higher sucrose content (55ºBx), maximizing WL and minimizing SG.

Published
2020-06-24
Section
Heat and Mass Transfer