Influence of glycerol on the molecular mobility, oxygen permeability and microstructure of amorphous zein films

Zein-based films and their usage for controlled delivery: Origin, classes and current landscape

“…Similar phenomena also were observed in pluronic F127-plasticized zein films [58]. Interestingly, glycerol at low content (≤ 10%) was found to act as an antiplasticizer as evidenced by the [25] decreased local dipolar relaxation of the zein matrix, while at high content (≥20%), a transition from antiplasticizer to plasticizer was observed [52]. The author declared that no crystallization or phase separation occurred in the glycerol plasticized zein films.…”

“…The author declared that no crystallization or phase separation occurred in the glycerol plasticized zein films. However, glycerolmediated zein aggregation up to few micrometers was observed in a concentration-dependent manner from 5% to 30% [52].…”

“…Generally, use of polar plasticizers resulted in the poor ability of film to provide a barrier to water vapor due to their inherent hydrophilic properties compared with amphiphilic plasticizers, although both types could improve the mechanical properties of the films [34,37,45]. The effects of plasticizers on oxygen permeability are more complicated, and controversial results were reported [45,52,57]. Glycerol was found to suppress oxygen permeability in zein film in a dose-dependent manner by decreasing oxygen solubility, although increasing oxygen diffusion rate was demonstrated [52].…”

“…The effects of plasticizers on oxygen permeability are more complicated, and controversial results were reported [45,52,57]. Glycerol was found to suppress oxygen permeability in zein film in a dose-dependent manner by decreasing oxygen solubility, although increasing oxygen diffusion rate was demonstrated [52].…”

Going Natural: Using polymers from nature for gastroresistant applications

“…Being labelled in the US as "confectioner's glaze", it is found as an ingredient of various food products, such as the caramel sweets, "sugar babies". Zein has also been used to form edible films exhibiting antioxidant, antimicrobial or simple barrier properties for food packaging (Cheng et al, 2015;Escamilla-García et al, 2013;Gezer et al, 2015;Güçbilmez et al, 2007;Liang et al, 2015;Ünalan et al, 2013).…”