Characterizations of Two Physically Modified Sodium Alginate Composite Films and Their Preservation of Refrigerated Sea Bass (Lateolabrax Maculatus)

Abstract

In order to alleviate the environmental pressure caused by polyethylene packaging, a degradable SA film was developed by blending and crosslinking. Among them, gallic acid was used to provide antimicrobial and antioxidant properties of the films. The results manifested that the G' and G", the mechanical property, and water vapor permeability (WVP) of cross-linked film (CF) were better than those of the blended film. The observations of SEM and AFM showed that the structure of CF was more compact than that of BF. The GA-containing film showed complete shielding of UV at around 300 nm film. Both films exhibited the radical scavenging for up to 80% DPPH. Fish wrapped with BF and CF extended the shelf-life for another 6 days, compared to the control group. Therefore, GA-containing BF and CF, as renewable films, were used in active packaging to protect products from UV light, oxygen, and microorganisms.

Keywords: Physical modification, Sodium Alginate, Lateolabrax maculatus, Preservation