Effect of different modified potato starch on starch-based films containing ZIF-67@thymol.

Zeolite imidazolate framework-67 (ZIF-67) was used to encapsulate thymol (THY) to improve the properties of potato starch films. The effect of different modified potato starches (acetate starch (AS), hydroxypropyl di-starch phosphate (HDSP), oxidized hydroxypropyl starch (OHS), and acetylated di-starch phosphate (ADSP)) on the film properties was investigated. The results showed that the modified potato starch film had better water resistance, mechanical property, and water vapor barrier than the natural potato starch film. Scanning electron microscopy observations showed that the smoothness of the modified film was advanced. Notably, the OHS film had the best oxidation resistance activity of 76.93 % compared to the other four films. Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli) were significantly inhibited in all potato starch films enhanced with ZIF-67@THY. Therefore, starch-based films incorporating ZIF-67@THY have a broad application prospect in food packaging.