Physical Aging of Amorphous Fructose

Physical aging of amorphous anhydrous fructose at temperature 5 °C and at 22 °C was studied using differential scanning calorimetry (DSC). The dynamic glass transition temperature, T g0 for unaged samples was 16 °C and 13.3 °C for heating rate of 10 °C/min and 1 °C/min, respectively. The fictive temperature, T f0 for unaged samples calculated by Richardson and Savill method was 12 °C, which is close to the dynamic value obtained from the lower DSC heating rate. The fictive temperature T f of the aged fructose glasses at temperatures both below and above the transition region was fitted well by a non‐exponential decay function (Williams‐Watts form). Aging above the transition region (22 °C) for 18 d increased both the dynamic glass transition temperature T g and the fictive temperature T f . However, aging below the transition region (5 °C) for 1 d increased the dynamic glass transition temperature T g but decreased the fictive temperature T f .