Authors: S.Parvathy and B.R.Venkatraman
The development of Nanoscience and nanotechnology in the last decade offers a great opportunity for exploring the bactericidal effect of metal nanoparticles such as silver. The inhibitory and bacterial effects of the silver salts are well known since antiquity. There have been many reports on the synthesis of silver nanoparticles (AgNps) using extracts of plant parts such as leaf, root, bark, seeds, and fruits as reducing agent. Based on the importance of green synthesis of AgNps using plant extract, presently an attempt has been made to synthesize AgNps using leaf extract of Solanum erianthum (D.Don) (SE). The synthesized AgNps (SEAgNps) were initially identified by the colour change and characterized using UV-visible (UV-vis) absorption spectrum, Fourier transform-Infrared (FT-IR) spectrum, X-ray diffraction (XRD) analysis and Transmission electron microscopy (TEM). The antibacterial and antifungal activities of the SEAgNps against nineteen pathogens and five fungal stains, respectively were examined. In the antibacterial activity study, the most significant result observed against Shigella boydii and for antifungal activity, the most notable inhibition showed against T.rubrum than that of tested controls. Qualitative phytochemical screening of leaf extract of SE was studied. Four solvents viz, hexane, methanol, ethyl acetate and water were used to obtain extracts from dry plant leaves powder. The extracts were subjected to qualitative phytochemical screening using standard procedures. Phytochemical screening revealed the presence of alkaloids, steroids, phenols and terpenoids in most of the above extracts.
Keywords: Silver nanoparticles; Green synthesis; Solanum erianthum; Antibacterial, Antifungal; Phytochemical screening