Structure and properties of starch/chitosan food packaging film containing ultra-low dosage GO with barrier and antibacterial

• Published in: Food hydrocolloids Vol. 137; p. 108329
• Main Authors: Wu, Lei, Lv, Shenghua, Wei, Dequan, Zhang, Siran, Zhang, Shanshan, Li, Zexiong, Liu, Leipeng, He, Tingxiang
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.04.2023
• Subjects: Antibacterial; Barrier; Chitosan; Graphene oxide (GO); Starch/chitosan composite film; UV shielding; Barrier; Graphene oxide (GO); Chitosan; Antibacterial; UV shielding; Starch/chitosan composite film
• ISSN: 0268-005X; 1873-7137
• DOI: 10.1016/j.foodhyd.2022.108329

Using urea as an intermediate, graphene oxide (GO) was modified with carboxymethyl cellulose (CMC) to obtain a uniformly dispersed GO monolayer dispersion for starch/chitosan composite preparation films. The structure and properties of modified GO and starch/chitosan composite films were characterized by FTIR, XRD, and TG. It was found that the modified GO could form a single layer uniformly and stably dispersed in the starch/chitosan composite film. At low GO content (0.01 wt%), the tensile properties of the films increased by 91.7% to 62.5 MPa compared with the control group, the water vapor permeability (WVP) was low, the water resistance was good, and the UV shielding effect was maintained at 92% under 50% visible light. At the same time, the film changed from overflow antibacterial mode to contact antibacterial mode. The antibacterial ability against Escherichia coli and Staphylococcus aureus increased by 23.8% and 25.6%, respectively, compared with the control group. It has an apparent preservation ability for fresh fruit. These excellent characteristics can be widely used in food packaging and pharmaceutical fields. [Display omitted] •GO was modified by CMC and urea to obtain CMC-urea-GO composite for dispering GO.•A functional film was prepared by mixing modified starch, chitosan and 0.01% dosage GO.•Starch/chitosan/GC film has good barrier, antibacterial and anti-ultraviolet properties.•Starch/chitosan/GC film can shield 92% UV under 50% visible light transmittance.