Abstract

Aim of study was to model rehydration of yam chips dried in a microwave oven at different power levels. We used a completely randomized3² factorial design corresponding to the numeric variables of power (420, 560 and 700 W) and mass (50, 60 and 70 g) in 1 cm thick×3 cm-diameter yam chips. 3 repetitions were made for a total of 27 experimental units. 2, 5 g yam chips were rehydrated using a 2.5 g/100 mL NaCl solution at 25°C. Power and mass variables showed significant differences (p<0.05). The maximum water absorption is given under the conditions of 700 W power and 70 g mass. Data obtained were evaluated through the following empirical models: Exponential Model, Peleg Model, First-order Kinetics, Weibull Distribution and Normalized Weibull Distribution. The results showed that Peleg model fitted much better (R² 97,9% and 0.001 $<$ SSE $<$ 0.01), which suggests that this is the model that best describes the rehydration characteristics of yam.

Keywords:

Empirical models, model fitting, moisture, power, water adsorption,

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