3D printed corn starch–gelatin film with glycerol and hawthorn berry (Crataegus pinnatifida) extract

摘要

The effects of glycerol (1, 2, 3, 4, and 5% wt/vol) and hawthorn berry (Crataegus pinnatifida) extract (HBE) (2, 4, 6, 8, and 10% wt/vol) on texture of film-forming blends, film’s physical, mechanical, and antimicrobial properties of 3D-printed corn starch–gelatin edible films (CSG) were assessed. The mechanical properties of the hydrogel, the thickness of the film, and its water solubility improved as the glycerol concentration increased. In addition, the formulation with the desirable properties was observed in 4% (wt/vol) glycerol’s film, with the elongation at break (%E) at 71.57%. Meanwhile, higher HBE improved film’s thickness, water solubility, yellowness, redness, and color index (ΔE). A film with 6% (wt/vol) HBE exhibited good tensile strength (TS), and %E hence was determined as the final film-formulation in 3D-printed CSG films. Films with 4% (wt/vol) glycerol and 6% (wt/vol) HBE inhibited against Pseudomonas aeruginosa, suggesting it can be utilized in antibacterial food packaging.