Molecular mobility and oxygen permeability in amorphous β-lactoglobulin films

摘要: Abstract An understanding of the solid-state matrix mobility that underlies macromolecular behavior is important to exploit edible film technology effectively. This study used phosphorescence erythrosin B monitor molecular in amorphous thin films (∼40 μm) β -lactoglobulin as a function temperature. Emission peak energy and bandwidth were determined by fitting emission spectra log-normal function; gradually decreased with temperature indicating dipolar relaxation rate increased Phosphorescence lifetimes from stretched exponential analyses decays air nitrogen; interpreted terms constants associated various processes contribute de-excitation probe's excited triplet state. The lifetime nitrogen at low more steeply high collisions was identical −20 °C but lower all higher temperatures oxygen quenching state activated temperatures. oxygen-quenching rate, which reflects permeability, directly proportional collision over entire interval −20 120 °C.