Efecto del almacenamiento sobre las propiedades físicas de las películas de quitosano con inclusión de aceites esenciales de tomillo y romero

The effect of factors of humidity, temperature and time on the physical properties of chitosan films with and without the thyme and rosemary essential oils inclusion was studied. The thyme (TEO) and rosemary (REO) essential oils were included in 0.5:1 and 1:1 v/w (EOs:CH), as well as their combination 50:50 (TEO:REO). The films were stored at temperatures of 5, 20, 33°C and relative humidities of 60 and 93% during four weeks. Storage conditions modify the physical properties of the films due to their hydrophilic behavior, the plasticizing effect of the water molecules and the retrogradation phenomena influenced by storage temperature and time.

Chitosan; polymers; modified films; food additives