This investigation was conducted to study the behaviour of dehydrated products of cocoyam and plantain in a
controlled storage environment at temperature range of 25 and 40oC. Salt solutions were used to achieve water
activity that ranged from 0.08 to 0.97. Equilibrium moisture content obtained was used to produce sorption
isotherms at these temperatures. Sorption models of Halsey, Chung Pfost, and Henderson were evaluated on the
experimental data as well as modified versions of Halsey and Henderson. Co-efficient of determination ranged
from 0.80 to 0.97 in all the models. Most equilibrium moisture content obtained during the experiment reflected
adsorption except for very low water activity. Chung Pfost equation gave the best fit for the absorption
characteristics of these crops having the least residual mean square within 0.03 to 0.11%. Plantain exhibited
higher affinity for water than cocoyam in all the relative humidity range. Least moisture content derived for
storage stability of these crops varied from 6.5 to 8.2 and 6.3 to 8.2 % in cocoyam and plantain respectively. The
region of local isotherm II of relative humidity between 23 and 65 % was identified as the region for optimum
storage
