Intelligent films of marine polysaccharides and purple cauliflower extract for food packaging and spoilage monitoring.

In this study, metalloanthocyanin-inspired, biodegradable packaging films were developed by incorporating purple cauliflower extracted (PCE) anthocyanins into alginate (AL)/carboxymethyl chitosan (CCS) hybrid polymer matrices based on complexation of metal ions with these marine polysaccharides and anthocyanins. PCE anthocyanins-incorporated AL/CCS films were further modified with fucoidan (FD) because this sulfated polysaccharide can form strong interactions with anthocyanins. Metals-involved complexation (Ca and Zn-crosslinked films) improved the mechanical strength and water vapor permeability but reduced the swelling degree of the films.