Kinetic studies of degradation of saffrom carotenoids encapsulated in amorphous polymer matrices

摘要

Kinetic studies on degradation of saffron water soluble carotenoids (mainly crocins) encapsulated in three different amorphous matrices (pullulan and two polyvinylpyrrolidoen, PVP, samples differing in their molecular weight) were carried out at different watr activity (a_w) conditions (0.43, 0.53, 0.64 and 0.75) in the dark at 35 deg C. Degradation of the polar pigments was monitored by periodic measurements of the coloring strength. Among the polymeric matrices used as wall materials, which largely decreased the oxidation rates of crocetinglycosides, PVP 40 was the most effective carrier under all storage conditons.