The final water content is a characteristic of each product. This is
the optimal value for which the product does not deteriorate and
keeps its physico-chemical quality [12]. The drying kinetic is
recognized by direct calculation of the water contents derivative of
experimental points using appropriate software. The theory
developed by Van Meel used the initial moisture content (M0) with
the equilibrium moisture content (Me) and initial drying rate
dM
dt
0
to normalize the moisture ratio and the dimensionless
drying rate as presented in eq. (2) and eq. (3) respectively: