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Nanotechnology has emerged as the most active modern research field in the area of science and technology. Various physical, chemical, and biological methods have been used for metal nanoparticle synthesis. Some examples of metal nanoparticles are gold, silver, zinc, and iron nanoparticles, etc. Physical and chemical methods are costly, require high energy, harsh conditions and toxic chemicals, and generate hazardous compounds. Biological methods using microbes or plant extracts are green processes for the synthesis of nanoparticles. Green synthesis of nanoparticles using plant extracts is a faster, cheaper, eco-friendly bio-catalytic reaction. Plant extracts contain a diverse range of bioactive compounds, including polyphenols, flavonoids, and terpenoids, which possess reducing properties. Iron nanoparticles (INPs), due to their innate and non-toxic properties; have attracted the attention of a lot of researchers. Several researches have been carried out all over the world to explore their role in theranostic, targeted drug delivery, catalysts, antioxidant activity, antimicrobial activity, Magnetic Resonance Imaging (MRI), Magnetic Particle Imaging (MPI), treatment of wastes, degradation of antibiotics and dyes, and remediation of heavy metals and radioactive materials. The present review highlights the biogenic formation of INPs from various plants and summarizes to some degree its role in different applications of the biomedical field. The last section of this review article is dedicated to the summarized perspective on the use of magnetic nanoparticles in medical applications.
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