This paper describes green, simple, and efficient method for the synthesis of magnetite nanoparticles (Fe3O4 NPs) using Acacia concinna fruit extract for the first time. A. concinna fruit extract is used as reducing and stabilizing agent. Reduction of Fe3+ ions by A. concinna fruit extract is examined by UV‐visible absorption spectra (UV‐Vis‐NIR). To recognize the functional group responsible for Fe3O4, the NPs are characterized by Fourier transform infra‐red spectroscopy (FTIR). The structural analysis of Fe3O4 NPs is done by X‐ray diffraction (XRD) which confirms cubic spinel structure and the average crystallite size of obtained NPs is found to be 28 nm. The morphological studies of Fe3O4 NPs are done by scanning electron microscope (SEM) which depicts the quasi‐spherical morphology. The green synthesized Fe3O4 NPs shows distinctive antibacterial activities against gram‐negative E. coli and Pseudomonas aeruginosa microorganism which confirms its potential in biomedical applications.
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