Fig. 4 shows isotherms obtained for all three sets of extrudate samples i.e. the control (a), the myristic acid (b) andthe palmitic acid (c) containing ones.
The shape of all curves appears to be bimodal i.e. for low relative humidity values(below 40%) limited moisture adsorption was observed up to approximately 40% relative humidity whereas at higher relative humidity values the adsorption capacity of the extrudates was progressing as the relative humidity was rising