Green Synthesis of Metallic Nanoparticles for Biomedical Applications

Green synthesis harnesses biological resources—such as plant extracts, microbes and biomolecules—to drive the reduction of metal salts into nanoscale particles under mild, eco-friendly conditions. By replacing hazardous reagents with naturally occurring phytochemicals or microbial enzymes, researchers can tailor nanoparticle size, shape and surface chemistry without generating toxic by-products. Metallic nanoparticles produced in this way, including gold, silver, copper and zinc oxide, exhibit unique optical, electronic and antimicrobial properties that are exploited in drug delivery, diagnostic imaging, photothermal therapy and antimicrobial coatings. Careful control of extract composition and reaction parameters yields biocompatible, stable colloids with minimal downstream purification, offering a scalable route to materials with global significance in low-resource settings and advanced medical technologies alike.

Research from Nature Portfolio

Recent investigations have demonstrated the plant-mediated fabrication of zinc oxide nanoparticles using medicinal leaf extracts, achieving uniform spherical particles (3–68 nm) with exceptional purity and narrow size distributions. Bioactive flavonoids and terpenoids acted both as reducing agents and surface ligands, imparting colloidal stability and enhanced antimicrobial efficacy against clinical strains of Escherichia coli and Staphylococcus aureus. Detailed spectroscopic and microscopy analyses revealed the role of functional groups in capping and crystallite formation, while in vitro assays confirmed low cytotoxicity towards mammalian cells, underscoring the clinical potential of phytochemical-directed oxide nanostructures.

Green Synthesis of Metallic Nanoparticles for Biomedical Applications publication trend

The graph below shows the total number of articles in green synthesis of metallic nanoparticles for biomedical applications across all publications each year (not limited to Nature Index journals).

Technical terms

Phytochemical: A plant-derived organic compound (e.g. flavonoids, terpenoids) that reduces metal ions and stabilises nanoparticles.

Bimetallic nanoparticle: A nanoscale particle composed of two different metals, offering combined optical, catalytic or magnetic properties.

Capping agent: A molecule adsorbed on nanoparticle surfaces to prevent aggregation and control growth.

Biocompatibility: The ability of a material to interact with biological systems without eliciting adverse effects.

References

1. Green Synthesis of Metallic Nanoparticles via Biological Entities. Materials (2015).
2. Green route to synthesize Zinc Oxide Nanoparticles using leaf extracts of Cassia fistula and Melia azadarach and their antibacterial potential. Scientific Reports (2020).
3. A review of physical, chemical and biological synthesis methods of bimetallic nanoparticles and applications in sensing, water treatment, biomedicine, catalysis and hydrogen storage. Advances in Colloid and Interface Science (2023).
4. Exploring the scalability and commercial viability of biosynthesized nanoparticles for cooling panels with the help of Artificial Intelligence and solar energy systems. Green Technologies and Sustainability (2023).