摘要：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
M
0
and the equilibrium moisture
M
E
as a function of Isothermal Dehydration Time (IDT). The moisture percentage for any time
t
and dehydration rate (isolines M(t) and isolines
v
I
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
v
0
and initial moisture
M
0
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
v
k
(H
2O molecules out of NCG) and verify that the rate of change in moisture and the dynamical proportionality constant
k
has a non-linear dependence on the IDT and that
k
is directly proportional to
D
e
f
f
. The
k
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.
关键词：enasymptotic model;steeping time influence;grain hydration process;nixtamalization;isothermal dehydration
