Glass transition of hydrated wheat gliadin powders.

Modulated-temperature differential scanning calorimetric and dynamic mechanical analyses and dielectric spectroscopy were used to investigate the glass transition of hydrated wheat gliadin powders with moisture absorption ranged from 2.30 db% to 18.21 db%. Glass transition temperature ( T) of dry wheat gliadin was estimated according to the Gordon-Taylor equation. Structural heterogeneity at high degrees of hydration was revealed in dielectric temperature and frequency spectra. The activation energies ( E) of the two relaxations were calculated from Arrhenius equation. [ABSTRACT FROM AUTHOR]