Eco-friendly biosynthesized silver, copper, and nickel nanoparticles mediated Rheum ribes: Assessment of their cytotoxicity and antimicrobial activity

[Display omitted] •Ag-, CuO- and NiO-NPs were synthesized from Rheum ribes for the first time in an eco-friendly.•The smallest size of the synthesized metal nanoparticles was Ag-NPs.•The most effective anti-cancer activity on A549 cancer cells was achieved by Ag-NPs.•The best antibacterial activity was observed with Ag-NPs for E. coli and NiO-NPs for S. aureus. The green synthesis of metallic nanoparticles has recently become a research area of increasing interest due to their potential applications in nanomedicine. This study aimed to investigate, for the first time, the anticancer properties of silver nanoparticles (Ag-NPs), copper oxide nanoparticles (CuO-NPs), and nickel oxide nanoparticles (NiO-NPs) on A549 and Beas-2B cell lines, as well as their antibacterial efficacy against Escherichia coli and Staphylococcus aureus strains, synthesized through a green synthesis approach utilizing Rheum ribes plant extract. The current study introduces a sustainable and environmentally friendly method for the biosynthesis of Ag-NPs, CuO-NPs, and NiO-NPs utilizing the aqueous extract of Rhubarb (Rheum ribes). The spectroscopic and morphological properties of the Ag-NPs, CuO-NPs, and NiO-NPs obtained from the Rheum ribes extract were confirmed using different analytical techniques. The Ag-NPs, CuO-NPs, and NiO-NPs exhibited different morphology with a size of about 7.90, 12.0, and 12.63 nm, respectively, and were free of impurities and highly stable particles. In addition, the NPs were further investigated for their anticancer and antibacterial properties. The anticancer effects of the NPs were assessed using the MTT assay and confocal microscopy in non-small cell lung cancer (A549) and healthy lung (Beas-2B) cells. The study results demonstrated that Ag-NPs, CuO-NPs, and NiO-NPs had cytotoxic effects on A549 cells that were concentration-based, having IC50 values of 4.16, 21.28, and 37.68 μg/mL, in that order. Additionally, it was observed that the above-mentioned NPs exhibited strong activity against bacteria. The nanoparticles derived from Rheum ribes extract appear to hold great potential as a class of nano-biomaterials intended for usage in biological fields.