Mass transfer of kaffir lime peel during osmotic dehydration was investigated in this paper. Processing
factors were solute concentrations, process temperatures, and immersion time. The results showed that
increasing solute concentration and process temperature resulted in a higher reduction in moisture con-
tents of kaffir lime peel and increase in water loss and solid gain rates. Analysis of variance showed sig-
nificant effects (P < 0.05) of all processing factors except process temperatures for water loss. Multilayer
feedforward neural network (MFNN) was proposed to predict percentages of water loss and solid gain of
kaffir lime peel during osmotic dehydration based on three processing factors as inputs. The best network
with the lowest average mean squared error (MSE) of 0.0066 and the highest average regression coeffi-
cient (r
2
) of 0.9725 from normalized training and validating data sets was composed of one hidden layer
with five hidden neurons and used Levenberg–Marquardt algorithm as a training algorithm. A simulation
test showed good generalization of the successfully trained MFNN model with the average MSE of 6.5813
and 5.9340, and average r
2 of 0.9745 and 0.9632, respectively, for water loss and solid gain. Compared
with multiple linear regression models, MFNN was found to be more suitable for predicting water loss
and solid gain during the OD process of kaffir lime peel.