Use of DSC, DVS-DSC, and DVS-fast GC-FID to Evaluate the Physicochemical Changes that Occur in Artificial Cherry Durarome~(~R) upon Humidification

摘要

Physicochemical changes that occur in artificial cherry Durarome~(~R) (benzaldehyde entrapped in an amorphous sucrose glassy matrix) when exposed to humid environments were evaluated using differential scanning calorimetry (DSC), dynamic vapor sorption (DVS) and DSC (DVS-DSC), and DVS-fast gas chroma-tography-flame ionization detection (DVS-fast GC-FID). The average measured midpoint glass transition temperature (Tg) value for "as is" Durarome was 45.9 +- 1.86℃, indicating that Durarome is in the glassy state at the experimental temperature (T) of 25℃. Humidification of Durarome increased the matrix moisture content and subsequently depressed its Tg. An appreciable percentage of the original benzaldehyde released from the Durarome matrix, measured using the dynamic, open DVS system, began when the Tg was depressed to approximately -5℃, or T-Tg = 30℃. Volatile release initiation is influenced by the physicochemical characteristics of both the matrix material and the volatile compound, as well as the humidification system used (that is, static, closed versus dynamic, open). Thus, it is reasonable to expect that each volatile entrapping matrix system will exhibit a different T-Tg release profile.