It should be noted that
for each of the models a good fit for the experimental data was
observed. Specifically, all the calculated R2values fell in the
0.967e0.999 interval, whereas the RMSE changed from 0.0015 to
0.0576. For whole fruits (WF), the highest values of R2 (above 0.995)
and the lowest values of RMSE (below 0.0199) were obtained when
a logarithmic model was used to describe the drying kinetics of
cranberries. However, for pulped fruits (PF) the smallest discrepancies
between the calculated and experimental values (meaning
the lowest values of RSME) were observed in the case of the Page
model and theWang and Singh model. They provided RSME values
of less than 0.0146. Moreover, the value of R2 in these models was
the highest and exceeded 0.996 regardless of drying temperature.
The calculated coefficients for the relevant equations are collected
in Table 4. Marques and Freire (2005) studied the freeze-drying
process of tropical fruits and they found that the best equation to
represent the drying kinetics for the freeze-drying of pineapple,
guava and mango pulps was the one proposed by the Page model.
Similar results were found by Kirmaci, Hüseyin, and Menlik (2008)
during a study into the freeze-drying behavior of strawberry slices.
The Page model is also often used for the description of the kinetics
of convective drying materials (Sarimeseli, 2011a). In our study, the
Page model gave the best fit only in the case of PF.