title: Photosensitized synthesis of silver nanoparticles using Withania somnifera leaf powder and silver nitrate.
abstract: The metal nanoparticle synthesis is highly explored field of nanotechnology. The biological methods seem to be more effective; however, due to slow reduction rate and polydispersity of the resulting products, they are less preferred. In the present study, we report rapid and facile synthesis of silver nanoparticles at room temperature. The exposure of reaction mixtures containing silver nitrate and dried leaf powder of Withania somnifera Linn to direct sunlight resulted in reduction of metal ions within five minutes whereas, the dark exposure took almost 12h. Further studies using different light filters reveal the role of blue light in reduction of silver ions. The synthesized silver nanoparticles were characterized by UV-Vis, Infrared spectroscopy (IR), Transmission Electron Microscopy (TEM), X-ray Diffraction studies (XRD), Nanoparticle Tracking Analysis (NTA), Energy Dispersive Spectroscopy (EDS), and Cyclic Voltammetry (CV). The Antibacterial and antifungal studies showed significant activity as compared to their respective standards.
authors.affiliation: Department of Botany, The Institute of Science, 15 Madame Cama Road, Mumbai 400032, Maharashtra, India. Electronic address: r_raut@rediffmail.com.
authors.forename: Rajesh Warluji
authors.initials: RW
authors.lastname: Raut
authors.affiliation: Department of Botany, The Institute of Science, 15 Madame Cama Road, Mumbai 400032, Maharashtra, India.
authors.forename: Vijay Damodhar
authors.initials: VD
authors.lastname: Mendhulkar
authors.affiliation: Department of Chemistry, The Institute of Science, 15 Madame Cama Road, Mumbai 400032, Maharashtra, India.
authors.forename: Sahebrao Balaso
authors.initials: SB
authors.lastname: Kashid
mesh_terms: D000890:Anti-Infective Agents / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D001231:Aspergillus flavus / Q000187:drug effects; D001234:Aspergillus niger / Q000187:drug effects; D055664:Electrochemical Techniques; D004926:Escherichia coli / Q000187:drug effects; D007477:Ions / Q000737:chemistry; D008027:Light; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000633:toxicity; D008826:Microbial Sensitivity Tests; D010084:Oxidation-Reduction; D018515:Plant Leaves / Q000737:chemistry / Q000378:metabolism; D012834:Silver / Q000737:chemistry*; D012835:Silver Nitrate / Q000737:chemistry*; D013211:Staphylococcus aureus / Q000187:drug effects; D013696:Temperature; D032341:Withania / Q000737:chemistry* / Q000378:metabolism
chemical_list: D000890:Anti-Infective Agents; D007477:Ions; D012834:Silver; D012835:Silver Nitrate
keywords: Antibacterial; Antifungal; Blue light; Silver nanoparticles; Sunlight; Withania somnifera