<div>The present work reports the first green synthesis of zinc oxide nanoparticles (ZnO-NPs) using Tecoma stans leaf extract. The ZnO-NPs have been investigated by X-Ray Diffraction (XRD), Ultra Violet-Visible (UV-Vis), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM) and Fourier Transform-Infra Red (FT-IR) analysis. XRD investigation confirms the crystalline structure of ZnO. The TEM images show triangular shape ZnO-NPs with sizes running from 15-20 nm. The XPS spectrum revealed the presence of Zn and O in the sample. Photoluminescence studies of ZnO-NPs displayed a sharp emission of blue band at 447 nm which is attributed to the defect structures in ZnO crystal. The presence of alcoholic, phenolic amide groups in the plant extracts is responsible for the formation of ZnO-NPs. The synthesized ZnO-NPs showed a very high antibacterial property against five bacterial strains such as Bacillus cereus,</div><div>Acinetobacter johnsonii, Achromobacter xylosoxidans, Achromobacter spanius and Chromobacterium pseudoviolaceum, with the highest zone of inhibition (ZOI) of 24 mm being shown against Achromobacter spanius strain. Further, the synthesized nanoparticles displayed excellent activities against four fungal strains, where a highest ZOI of 30 mm was observed against Penicillium citirinum, hence proving its high efficacy as antimicrobial agents.</div>
<p>With an aim to introduce a new highly potent antimicrobial nanoparticles using an environment-friendly route, he present work reports the green synthesis of iron oxide nanoparticles (Fe<sub>3</sub>O<sub>4</sub>NPs) utilizing <i>Mikania mikrantha</i> leaf extract and its application as efficient antimicrobial agent. The green Fe<sub>3</sub>O<sub>4</sub>NPs have been described by X-beam diffraction (XRD), Ultraviolet-Visible (UV-Vis) spectroscopy, Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM) and Fourier Transform-Infra Red (FT-IR) investigation. The TEM image shows the rhomboidal Fe<sub>3</sub>O<sub>4</sub>NPs with average mean sizes 20.27 nm. The FT-IR investigation proved Fe<sub>3</sub>O<sub>4</sub>NPs have been balanced out through the associations of steroids, terpenoids, flavonoids, phenyl propanoids, phenolic acids and proteins present in the leaf extract. The synthesized Fe<sub>3</sub>O<sub>4</sub>NPs shows a very high antibacterial and antifungal property against 5 bacterial strains such as <i>Bacillus cereus, Acinetobacter johnsonii, Pseudomonas aeruginosa, Achromobacter spanius </i>and <i>Chromobacterium pseudoviolaceum</i> strain, and 4 fungal strains (<i>Aspergillus niger, Penicillium citirinum, Fusarium oxysporium</i>, and <i>Candida albicans</i>). The green synthesized iron oxide nanoparticles can interfere metabolic activities of microorganisms which determine its antimicrobial properties and could bring a promising application in the fields of medicine. </p>
<p>With an aim to introduce a new highly potent antimicrobial nanoparticles using an environment-friendly route, he present work reports the green synthesis of iron oxide nanoparticles (Fe<sub>3</sub>O<sub>4</sub>NPs) utilizing <i>Mikania mikrantha</i> leaf extract and its application as efficient antimicrobial agent. The green Fe<sub>3</sub>O<sub>4</sub>NPs have been described by X-beam diffraction (XRD), Ultraviolet-Visible (UV-Vis) spectroscopy, Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM) and Fourier Transform-Infra Red (FT-IR) investigation. The TEM image shows the rhomboidal Fe<sub>3</sub>O<sub>4</sub>NPs with average mean sizes 20.27 nm. The FT-IR investigation proved Fe<sub>3</sub>O<sub>4</sub>NPs have been balanced out through the associations of steroids, terpenoids, flavonoids, phenyl propanoids, phenolic acids and proteins present in the leaf extract. The synthesized Fe<sub>3</sub>O<sub>4</sub>NPs shows a very high antibacterial and antifungal property against 5 bacterial strains such as <i>Bacillus cereus, Acinetobacter johnsonii, Pseudomonas aeruginosa, Achromobacter spanius </i>and <i>Chromobacterium pseudoviolaceum</i> strain, and 4 fungal strains (<i>Aspergillus niger, Penicillium citirinum, Fusarium oxysporium</i>, and <i>Candida albicans</i>). The green synthesized iron oxide nanoparticles can interfere metabolic activities of microorganisms which determine its antimicrobial properties and could bring a promising application in the fields of medicine. </p>
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