Cinnamaldehyde emulsions for a composite film based on polyvinyl alcohol/hydrophobically modified konjac glucomannan matrix: Degradability and bacteriostatic properties

Biodegradable polyvinyl alcohol (PVA) and hydrophobically modified deacetyl konjac glucomannan (DK) films loaded with cinnamaldehyde (CA) emulsion were developed and characterized. The particle size of 957.4 nm and encapsulation rate of 91.23 % confirmed that CA had been embedded in the O/W emulsion system. SEM and AFM analysis showed that the PVA/DK film was more compatible, while the CA emulsion provoked bubbles and bumps on the surface, significantly gaining roughness (Ra). Besides, the water absorbency and water vapors permeability of DK after acetylation modification was lower. Meanwhile, PVA and DK had complementary roles, blending the two to enhance the water resistance of PVA and ameliorate the fragile defects of DK while accelerating the degradation of the film. Above all, the CA emulsion film possesses a vigorous antibacterial effect on Escherichia coli and Staphylococcus aureus, and the PVA/DK/CA film has a potential application in food packaging.