Adsorption isotherms for CS and CS–CO blends in their native
and amorphous states determined at 25 ◦C are shown in Fig. 1a
through d. Fig. 1a shows the adsorption isotherms for native CS
and CS–CO blends in a dry solid weight basis (g/100 g of dry solids).
In this figure, it can be seen that the native material exhibited a
decreasing moisture content as the added CO increased from zero
(CS) to 9.3 (CS–CO-9.3%), at constant water activity. This result indicates
that the samples became less hygroscopic as the CO level
increased in the blends.