Synthesis and antibacterial characterization of sustainable nanosilver using naturally-derived macromolecules

Greener nanosynthesis utilizes fewer amounts of materials, water, and energy; while reducing or replacing the need fur organic solvents. A novel approach is presented using naturally-derived flavonoicls including Quercelin peniaphosphale (QPP), Quercetin sulfonic acid (QSA) and Apigenin Triphosphate (ATRP). These water soluble, phosphurylated flavonoids were utilized both as reducing agent. and stabilizer. The synthesis was achieved at room temperature using wafer as a solvent and it requires no capping agents. The efficiency of the resulting silver nanoparlicle synthesis was compared with naturally-occurring flavonoid such as Quercelin (QCR). Results show that QCR reduced Ag+ faster followed by QPP, QSA and ATRP respectively. This is the first evidence of direct utilization of QCR for synthesis of silver nanoparticles (AgNPs) in water. The percentage conversion of Ag+ to Ag-0 was determined to be 96% after 35 min. The synthesized nanoparlicles were characterized using Transmission electron microscopy (TEM), Energy dispersive absorption spectroscopy (EDS), UV vis spectroscopy, High resolution TEM (HR-TEM) with selected area electron diffraction (SAED). The particle sizes ranged from 2 to SO DID with an average size of 22 nm and in the case of ATRP, the nanoparticle shapes varied from spherical to hexagonal with dispersed particle size ranging from 2 to 30 nm. Crystallinity was confirmed by XRD and the SAED of (111), (200), and the fringes observed in HRTEM images. Results were in agreement with the UV resonance peaks of 369-440 nm. The particles also exhibit excellent antibacterial activity against Staphylococcus epidernadis, Escherichia colt and Citrobacter freandii in water. (C) 2015 ElsevierB.V. All rights reserved.