Abstract
In this study, we characterized an active film made of sodium alginate (SA)—locust bean gum (LBG) containing daphnetin-based film. Physicochemical characteristics, as well as antioxidant and antibacterial properties, were investigated. The results showed that the addition of a low concentration of daphnetin increased the flexibility of SA–LBG cling film, leading to an improvement in elongation at break and tensile strength. As the daphnetin content increased, solubility, brightness and transparency of the cling film decreased, and the moisture permeability increased. The antioxidant capacity and antibacterial activity of films with daphnetin were improved compared to those of the basal film. In addition, the cling film formed by adsorption had higher bacterial (Shewanella putrefaciens and Pseudomonas fluorescens) inhibition and antioxidant activity rates than direct film formation. The results indicate that the combination of daphnetin in SA–LBG film provides an active film with antioxidant and antibacterial properties, with potential for the development of food-grade packaging material.
Highlights
Packaging plays an important role in preventing spoilage and extending the shelf life of fresh food [1]
There was no significant difference in the thickness of the composite cling films as the content of daphnetin increased
When the cling film is used in food packaging, tensile strength (TS) and elongation at break (EAB) are usually applied to evaluate the mechanical properties of the films, which are important properties related to the strength and flexibility
Summary
Packaging plays an important role in preventing spoilage and extending the shelf life of fresh food [1]. Increasing demand for green and safe food packaging has led to the growing importance of natural green packaging materials. Sodium alginate (SA) is commonly found in brown algae, such as kelp and Sargassum, which is non-toxic and inexpensive It has the characteristics of degradability, safety, moisture retention, film formation and biocompatibility [7]. As a natural anionic linear polysaccharide, SA has good water solubility because its molecular structure has more carboxyl and hydroxyl groups. It is good for mixing and reacting with other substances in water, which provides conditions for improved performance [10]. The film-forming solution has reduced gelling ability and increased viscosity when preparing films, and the composite film exhibits good processing and mechanical properties [15,16]
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