Medicinal Plants - International Journal of Phytomedicines and Related Industries

The green synthesis, characterization, and antibacterial activity of silver nanoparticles mediated by Padina boryana are presented in this study. The synthesis of silver nanoparticles was validated by visual observation, including UV-visible spectroscopy, X-ray diffraction analysis, Fourier transform infrared spectroscopy, and scanning electron microscopy. UV-visible spectroscopy analyses revealed that the absorption spectra of the synthesized silver nanoparticles derived from P. boryana extract exhibited absorbance peak at 425 nm. The X-ray diffraction pattern indicated the crystalline nature of AgNPs. Fourier transform infrared spectroscopy data indicated the presence of biomolecules in the extract that functioned as reducing and capping agents for the synthesis of silver nanoparticles. Scanning electron microscopy revealed that the synthesized AgNPs were spherical with sizes ranging from 30 to 70 nm. The synthesized silver nanoparticles showed considerable antibacterial efficacy against both gram-positive and gram-negative bacteria. Our preliminary findings demonstrate that the aqueous extract of the Padina boryana is an effective reducing and capping agent for the biosynthesis of AgNPs with effective antibacterial activity.