Ulva rigida–mediated silver nanoparticles: synthesis, characterization, and antibacterial activity

The current study determines a simple and eco-friendly method for the synthesis of silver nanoparticles using the aqueous extract of Ulva rigida as a bio-capping agent. The synthesized silver nanoparticles (Ag NPs) were characterized, and their antibacterial properties were examined. The extract of U. rigida can reduce the silver ions into Ag NPs. The physicochemical properties of synthesized Ag NPs were determined using microscopic and spectroscopic analysis. The UV–Vis absorption peak at 401 nm is evidence of the occurrence of surface plasmon resonance (SPR) of Ag NPs. X-ray diffraction was studied, and the crystalline nature of biosynthesized Ag NPs was confirmed. The average size of U. rigida–mediated Ag NPs was 22.6 nm. The transmission electron microscope shows the monodispersed and spherical-shaped nanoparticles. Furthermore, the synthesized Ag NPs were evaluated against human pathogens such as Pseudomonas aeruginosa and Proteus vulgaris. Bio-fabricated U. rigida–assisted Ag NPs may be helpful in developing new drugs against multidrug resistance pathogens.