Characterization of biodegradable films based on extracellular polymeric substances extracted from the thermophilic microalga Graesiella sp.

In this research, a new type of biodegradable film based on the extracellular polymeric substances (EPS) and isolated from thermophilic microalga Graesiella sp., was formulated characterized. The EPS 0.221 mm thick. Atomic force microscopy scanning electron images revealed homogeneous character with lamellar microstructure. displayed yellowish color, high transparency, ultraviolet barrier properties, low oxygen (0.008 SI), water-vapor permeability (0.037 SI). Film tensile strength (16.24 MPa) elongation at break (4.76%) were in range common biofilms thermal analyses showed transition temperature (126 °C) stability (up to 800 °C). Compared ascorbic acid, results indicated that shows higher antioxidant activity, mainly as ?-carotene anti-bleaching (84%), DPPH- free radical scavenging ability (80%), ferrous iron-chelating (55%). effects beef meat packaging studied during nine days cold storage. polyvinylchloride-packed meat, EPS-packed samples color (redness = 13.6) pH (5.85) storage proliferation total viable counts (4.04 CFU·g?1) Pseudomonas bacteria (4.09 CFU·g?1). They also exhibit lower drip loss (9%) less metmyoglobin (32%), heme iron (4.87 ?g·g?1) volatile basic nitrogen (TVB-N 22.96 mg·kg?1), lipid oxidation (MDA 0.025 mg·kg?1). obtained highlight potential for use microalgae film-forming material could be applied preservation.