Abstract
Composite films containing different amounts of potassium sorbate (KS) were prepared by using fish scale collagen (Col) and polyvinyl alcohol (PVA). Fourier transform infrared spectroscopy (FTIR), light transmittance, mechanical, water vapor transmission rate (WVTR), and the antibacterial properties of the composite films were analyzed. The results showed that the addition of Col significantly reduced the light transmittance of the composite film, but KS had no significant effect on the light transmission. The tensile strength decreased first and then increased with the addition of KS, while the WVTR increased first and then decreased. The composite film exhibited a certain degree of antibacterial properties against E. coli and S. aureus. In addition, we found that ultrasonic treatment reduced the WVTR, and also improved tensile strength and elongation at break of the composite films, but had no significant effect on other properties. The KS/Col/PVA films have the potential to be used as antimicrobial food packaging.
Highlights
At present, safe and non-toxic degradable packaging materials are research hotspots in the field of food packaging, many researchers use natural biomacromolecules to form different films, such as proteins, polysaccharides, lipids, etc
In his research, that this yellowing of the films could could be explained by the partial degradation of sorbate by high temperatures employed in the could be explained by the partial degradation of sorbate by high temperatures employed in the be explained by the partial degradation of sorbate by high temperatures employed in the extrusion extrusion process, which probably favored the Maillard reaction between the carboxyl group of extrusion process, whichfavored probably
The mechanical properties of films were obtained at 25 ◦ C The tensile strength (TS) and elongation at break (EAB) of the films were measured by a universal testing machine (UTM, Instron 5583, Instron, Boston, USA)
Summary
Safe and non-toxic degradable packaging materials are research hotspots in the field of food packaging, many researchers use natural biomacromolecules to form different films, such as proteins, polysaccharides, lipids, etc. Kowalczyk et al used carboxymethyl cellulose as the substrate emulsion and added KS to the antifungal effect of the composite coated on apricot. It canthat effectively and added antifungal of the composite coated onand apricot KS as an antifungal films containing KS could guarantee the microbiological safety of fresh lasagna pastas and avoid agent to the hydroxypropyl composite andKS studied its effect on the the excessive consumption ofmethylcellulose-beeswax food additives [8]. Sodium to the hydroxypropyl methylcellulose-beeswax composite film and studied its effect on the physical methylparaben, and sodium hydroxybenzoate composite films all showed good preservation and chemical properties of the plums during cold storage.coated. Morphology, strength, WVTR, and antibacterial properties of composite films were discussed in relation to their ingredient concentration.
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