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The objective of this work was to evaluate the effect of green propolis extract (PE) and silica nanoparticles (SiO 2 ) on the structure of sodium alginate-based films (SA), as well as their physical and antioxidant properties. Control samples (only SA), films with SA and PE (SA/PE3%), as well as films simultaneously containing SA, PE and SiO 2 (SA/PE3%/SiO 2 5% and SA/PE3%/SiO 2 10%) were systematically evaluated. Scanning electron microscopy revealed homogenous distribution of PE and SiO 2 within the film matrix. The addition of both compounds increased tensile strength from 12.9 ± 1.2 (control) to 19.6 ± 1.4 MPa (SA/PE3%/SiO 2 10%), without noting any extreme changes in elongation at break or modulus of elasticity. Additionally, the incorporation of PE provided an outstanding UV light blocking effect, and strong DPPH radical-scavenging activity for all samples, therefore, suggesting their potential for future application in active food packaging.
Júnior et al. (Mon,) studied this question.