Development and characterization of biodegradable films of poly(vinyl alcohol)-corn starch incorporated with dried mangosteen (Garcinia mangostana L.) pericarp extract.

Abstract

his research study explores the fabrication of polyvinyl alcohol (PVOH) and corn starch (CS) with dried mangosteen pericarp extract (DMPE) as a natural antioxidant and antimicrobial agent, which is an abundant by-product from the food processing industry via solvent casting method. The effects of DMPE content (0%, 1%, 3%, and 5%) on the antioxidant capacity, antimicrobial activity, optical, physical, mechanical, and structural morphological characterization, and changes in PVOH-starch molecular structure of PVOH/CS films were investigated. The results revealed that with the increasing content of DMPE, prepared films' thickness and water vapor permeability slightly increased. The antimicrobial activity of M3,M5 films showed strong inhibition against Staphylococcus aureus ATCC 25923 and Escherichia coli ATCC10536 was observed . When DMPE power content was added, both tensile strength Elongation at break (E%) was decreased, which was shown in M5 (238.84 ± 18.38 MPA and 8.24 ± 1.01 %, respectively ). Adding DMPE to PVOH/CS films remarkably increased the antioxidant properties The highest antioxidant capacity and total phenolic compound (27.66 ± 0.73 mg TE/g film and 77.57 ± 0.39 mg GAE/g film). Ultimately, this study thus qualities the benefits of incorporating DMPE into PVA/CS films for potential application as active packaging films or coatings. These qualities can be useful when packing food items that oxidize and degrade.