Antioxidant and antibacterial potential of synthesized silver nanoparticles from the Polygonum Minus leaf aqueous extract Nor Amaiza Mohd Amin*, Nurhanis Najihah Ibrahim, Azhari Samsu Baharuddin
Process and Food Engineering Department, Faculty of Engineering, Universiti Putra Malaysia, UPM Serdang 43400, Selangor
Abstract
Silver nano particles, derived from the plant Polygonum minus (commonly known as kesum), have emerged as a promising class of nanomaterials owing to their unique properties, such as excellent photoluminescence, high water solubility, low toxicity, and good biocompatibility. Polygonum minus fresh and dried leaf aqueous extract was used in the synthesis of biogenic silver nanoparticles and the synthesized PM-AgNPs exhibited blue fluorescence emission under UV light and the excitation wavelength-dependent fluorescence enhancement. Furthermore, the PM-AgNPs carbon dots containing high phenolic content showed the antioxidant activity, while FTIR analysis identified the functional groups acting as reducing agents in the synthesis process. Following characterisation with TEM analysis corroborated by the SAXS and Fourier Transform Infrared (FTIR) Spectroscopy, the presence of biomolecules from the leaf extract was discovered, which were responsible for the formation of PM-AgNPs and determining their crystalline nature. The disc diffusion results revealed that PM-AgNPs suppressed both Gram-negative and Gram-positive bacterial growth.
