Green Synthesis of Metal Nanoparticles Using Plant Extracts

The green synthesis of metal nanoparticles (MNPs) has become a viable, economical, and environmentally beneficial substitute for traditional physical and chemical processes. The rich phytochemical profile of plants, which includes flavonoids, phenolics, alkaloids, tannins, and other bioactive chemicals, is utilized in this biogenic approach to serve as stabilizing, capping, and reducing agents. Many plant species, such as Camellia sinensis, Ocimum sanctum, Aloe vera, and Azadirachta indica, have shown exceptional effectiveness in creating stable and useful silver, gold, and other metal nanoparticles. A number of variables, including pH, temperature, the concentration of metal salts, and the content of the extract, affect the synthesis process.While the green route offers clear advantages in terms of safety, simplicity, and environmental impact, several challenges persist. These include batch-to-batch variability in plant extract composition, difficulties in large-scale production, limited understanding of the underlying biosynthetic mechanisms, and issues related to nanoparticle stability. Notwithstanding these obstacles, developments in biotechnology and nanotechnology keep improving green synthesis techniques. This study emphasizes the primary plant species employed in the production of nanoparticles, their modes of action, and the difficulties and opportunities facing this exciting field, which has the potential to completely transform industrial, environmental, and medicinal applications.