Effect of greenly synthetized silver nanoparticles on the properties of active starch films obtained by extrusion and compression molding. (1st June 2021)

• Record Type: Journal Article
• Authors: Ceballos, Rocío L.; von Bilderling, Catalina; Guz, Lucas; Bernal, Celina; Famá, Lucía
• Is Part Of: Carbohydrate polymers. Volume 261(2021)
• Publication Date: 2021-06-01
• Subjects: Active starch-based nanocomposites -- Silver nanoparticles -- Green synthesis -- Extrusion and compression molding -- Physicochemical properties -- Antibacterial activity; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2021.117871
• Languages: English
• ISSNs: 0144-8617

Abstract

Highlights: Silver nanoparticles were greenly synthetized with starch and yerba mate extract. Cassava starch-based nanocomposites with synthetized AgNP were obtained by extrusion. Films with 0.006 wt.% AgNP had higher ultimate strength and strain at break than TPS. 0.015 wt.% AgNP led to films with the best tensile and water resistance behavior. Low amounts of AgNP led to biodegradable films able to delay bacterial growth. Abstract: Replacing packaging plastics with biodegradable active materials is an emerging concern. In this context, thermoplastic starch (TPS) films and nanocomposites containing different concentrations of silver nanoparticles synthetized with starch and yerba mate (TPS-AgNP1 : 0.006 wt.% and TPS-AgNP2 : 0.015 wt.%) were developed by extrusion and compression molding. Spherical AgNP of 20−130 nm were obtained after the green synthesis and excellent adhesion between AgNP and the matrix was observed. Consequently, both composites exhibited higher stiffness and tensile strength values than TPS, indicating a reinforcing effect of AgNP. TPS-AgNP1 showed the highest strain at break and toughness values, and TPS-AgNP2 presented the lowest moisture content and ability to delay E. coli growth. Additionally, all materials disintegrated after 4 weeks of burial and resulted thermally stable up to 240 °C. This investigation provides a convenient and inexpensive way to develop starch-based nanocomposites with improved properties which appear to be promising as active packaging materials.