Mass transfer during the osmotic dehydration of West Indian cherry

The main purpose of this work was to study water loss, solids gain, and weight and moisture reduction during the osmotic dehydration process of the West Indian cherry (Malpighia punicifolia). The diffusion coefficient of West Indian cherry was estimated by the inverse method using average moisture contents. Osmotic dehydration was examined for 12 h in a 65°Brix solution at temperature of 27 °C, without agitation, using a fruit:solution mass ratio of 1:4, 1:10, and 1:15. The kinetics and internal changes occurring during the osmotic dehydration of West Indian cherry are reported. The product's drying kinetics was simulated using the diffusion model, and two optimization methods, Levenberg-Marquardt and Differential Evolution algorithm, were used to predict the diffusion coefficient. The results indicated that the two optimization methods performed similarly in estimating the diffusion coefficient adequately. The average calculated diffusion coefficient was 1.663 × 10−10 m2s−1, which is consistent with values reported in the literature.

► Osmotic dehydration of West Indian cherry using a fruit:solution mass ratio of 1:4, 1:10 and 1:15 was made. ► Water loss, solid gain and weight reduction of the sample were calculated. ► Diffusion coefficient of West Indian cherry was estimated by the inverse method. ► Levenberq-Marquardt and Differential Evolution algorithm were used to predict the diffusion coefficient.