Green synthesis of metronidazole or clindamycin-loaded hexagonal zinc oxide nanoparticles from Ziziphus extracts and its antibacterial activity

Green chemistry has become a fruitful approach for the synthesis of semiconductors and nanoparticles with various applications. Herein, we synthesized ZnO hexagonal nanoparticles (HNPs) by green precipitation method using fresh local Ziziphus leaf extract (Rhamnaceae) with a heating range of 60-80 in an alkaline medium. It was calcinated on a furnace at 500 degrees C for 2 h. to get a very fine and homogeneous pale-yellow powder which is then loaded with either metronidazole or clindamycin. The physical character-izations of the particles' morphology, size, and purity were measured using the Scanning electron microscope, UV-spectroscopy, and the Fourier transform infrared spectroscope. The size of ZnO nanoparticles (44.63 nm) was measured using scanning electron microscopy (SEM), and the mean crystal size of the precursor (17.37 nm) was measured using X-ray diffraction methods (XRD). The antibacterial activity of these particles was measured against Staphylococcus aureus bacterial strains and analyzed using a "well -diffu-sion technique" which revealed that metronidazole or clindamycin-containing ZnO nanoparticles showed good bactericidal activity.