Schiff base crosslinked gelatin-S. platensis protein concentrate films with enhanced antioxidant activity

COMAS, B.; SANCEHZ RIZZA, L.; RUSECKAITE, R.A.; MARTUCCI, J.F.

JOURNAL OF FOOD SCIENCE

WILEY-BLACKWELL PUBLISHING, INC

Lugar: Londres; Año: 2023

0022-1147

aim of this work is to produce bioactive films suitable for aerobic packaging applications by combining the bioactivity of Spirulina platensis protein concentrate (PC, 1 and 2% w/w), the sustainable nature of bovine gelatin (Ge) and sodium alginate dialdehyde (ADA, 5% w/w) as Schiff base crosslinking agent. PC was obtained by an optimized acid-base extraction process and characterized. PC showed a dose-dependent radical scavenging activity (RSA, IC50 = 24.3 mg/L) related to its high content of C-phycocyanin and total phenolic compounds (32.44±1.37 mg GAE/g PC). As a general trend, crosslinking decreased the water solubility, improved mechanical properties and helped improve RSA of Ge-ADA-PC films. Ge-5ADA-2PC film recorded the best compromise between solubility (only 33.6%), high UV barrier (0.134% transmittance at 400 nm), reasonable extensibility (217.00±2.34%), tensile strength (3.50±0.43 MPa), water vapor permeability (2.00±0.17⋅10-12 kg·m/m2·Pa·s) and RSA (44.70±2.19%). Wrapping hake fillets in this film delayed lipid oxidation during storage under refrigerated conditions for 11 d, maintaining the thiobarbituric acid index below 0.5 mg MDA/Kg muscle. Results suggest that Ge-ADA-PC films have the potential as aerobic packaging materials for oxidation-sensitive food.