BENDAHMANE DouaaALLAL Asma2026-09-282026-09-282026https://dspace.univ-temouchent.edu.dz/handle/123456789/7675This work focuses on the development of biodegradable polymeric films based on sodium alginate incorporating aqueous extract of Agave americana and silver nanoparticles (AgNPs) synthesized through a green method. AgNPs were synthesized using the plant extract and silver nitrate as a metallic precursor. Their formation was confirmed using several characterization techniques including UV-Visible spectroscopy, FT-IR, Zetasizer, and X-ray diffraction (XRD). The results demonstrated the formation of stable and crystalline silver nanoparticles. The prepared films exhibited good homogeneity, satisfactory flexibility, and physicochemical properties depending on the incorporated additives. The antioxidant activity evaluated by the DPPH assay showed a significant improvement in films containing plant extract and AgNPs. These findings highlight the potential of these biodegradable materials for applications in active packaging and biomedical fields.frSodium alginateAgave americanasilver nanoparticlesgreen synthesisbiodegradable filmsantioxidant activity.Thesis