Quercetin-functionalized Biodegradable Coatings for Smart Food Packaging Systems

This study presents the development of an eco-sustainable smart active packaging system based on a PBS/PVOH biodegradable film coated with a PLA layer functionalized with 3% quercetin, a natural antioxidant. The effects of quercetin incorporation on the thermal properties of the PLA coating, as well as on the mechanical, optical, and barrier properties of the resulting films, were evaluated. Additionally, the release kinetics and antioxidant activity of quercetin were investigated in both aqueous and fatty food simulants. The results showed that quercetin slightly reduced the stiffness of the coating, while flexibility was maintained. The oxygen permeability remained at levels suitable for packaging fresh fruits and vegetables, which require films that allow gas exchange for respiration. Release tests demonstrated a markedly higher and faster release in the fatty simulant, corresponding to greater antioxidant capability, highlighting the influence of food matrix composition on film active performance. These findings support the potential of quercetin-functionalized coatings as a sustainable and effective strategy for active food packaging, particularly for oxidation-sensitive products.