Mathematical Model for Describing Corn Grain Dehydration Kinetics after a Nixtamalization Process

In this research, the mathematical model associated with the hydrothermal dehydration process of Nixtamalized Corn Grains (NCG) with different Steeping Time (ST) values, allows the fitting of experimental data with initial moisture [Formula: see text] and the equilibrium moisture [Formula: see text] as a function of Isothermal Dehydration Time (IDT). The moisture percentage for any time [Formula: see text] and dehydration rate (isolines M(t) and isolines [Formula: see text] respectively) of the NCG is shown by means of matrix graphics as a simultaneous function of IDT and ST. The relationship between initial dehydration rate [Formula: see text] and initial moisture [Formula: see text] establishes as a function of ST. Also, the mathematical model associated with the solution of the second Fick’s law allows calculating the diffusivity rate [Formula: see text] (H(2)O molecules out of NCG) and verify that the rate of change in moisture and the dynamical proportionality constant [Formula: see text] has a non-linear dependence on the IDT and that [Formula: see text] is directly proportional to [Formula: see text]. The [Formula: see text] values strongly relate to ST and the calcium ions percentage into NCG according to solubility lime values into cooking water (or nejayote) as a function of decreasing temperature when ST increases.