Abstract
AbstractGlass transition temperatures (Tg) for dilute and concentrated glucose: fructose: water solutions have been determined by differential scanning calorimetry. The supplemented phase diagrams (glucose: fructose 1:4, 1:2, 1:1, 2:1, 4:1 (w/w)) are presented and from these the temperature (Tg') and concentration (C'g) of the maximally freeze‐concentrated glass have been determined. Theoretical predictions of Tg for binary (glucose: fructose) and tertiary (glucose: fructose: water) systems according to the Couchman–Karasz and Gordon‐Taylor equations are given and discussed. Annealing vitrified glucose: fructose glasses above their Tg allows the glass concentration to approach C'g as a result of ice formation. Viscosity measurements of fructose and fructose: glucose mixtures allow for a calculation of Tg of the non‐aqueous solutions.
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