Abstract

• In this research work, the eco-friendly starch silver nanocomposite films from Triticum aestivum L. (Wheat) and Manihot esculenta C. (Cassava Roots) were studied. Biosynthesis of starch silver nanoparticles was conducted by using silver nitrate as metal precursor and the starch solution of two plants: T. aestivum and M. esculenta as reducing and capping agents. The characterization of prepared starch capped silver nanoparticles and nanocomposite films from Wheat Flour and Cassava Roots were confirmed by XRD, FESEM and FT IR. The average crystallite sizes of prepared silver nanoparticles from T. aestivum (Wheat Flour) and M. esculenta (Cassava Root) were obtained in the range of 25-30 nm from XRD data. Different ratios of starch silver nanocomposite film were performed by the various concentrations of starch Wheat Flour solution, starch Cassava Root solution, silver nitrate solution, different stirring times and different temperatures. In addition, mechanical properties of prepared nanocomposite films were determined by thickness, tear strength, tensile strength and elongation at break. The swelling [S%] of the prepared nanocomposite films in distilled water was calculated. The antimicrobial activity of prepared nanocomposite film of Cassava Root was higher than those of pure starch extract of wheat flour and Cassava Root against S. aureus and B. subtilis by agar well diffusion method.