Abstract
Eutectic points (EPs) of polyols (sorbitol, xylitol, maltitol and lactitol) and the corresponding reducing sugars (CRS) (glucose, xylose, maltose and lactose) were determined from intercept between curve of freezing point (FP) which was obtained by differential scanning calorimetry (DSC) and plot of solubility. Glass transition temperature (Tg'), solute concentration (Cg') and unfrozen water (Wg') of maximally freeze-concentrated solutions were also obtained from the DSC measurement. In monosaccharides FPs of polyol were slightly higher than those of CRS and in disaccharides they were nearly equal to those of CRS. Solubilities of polyol were fairly higher than those of CRS. As a result, the EPs of polyol were at fairly lower temperature and higher concentration than those of CRS. Tg' values of polyol solutions tended to be lower than those of CRS, and in monosaccharides Tg' between two groups were nearly the same but in disaccharides considerably larger differences on Tg' between two groups were found. Cg' values of all used samples were made ranging in concentration from 73% to 87% and were nearly equal to those in literature (Roos).
