Browsing by Author "Suresh, J."

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Green synthesis of CuO/MgO/ZnO nanoparticles using Costus pictus leaf extract for effective antibacterial applications
(Elsevier B.V., 2024) Kumar, P.; Ramesh, M.R.; Doddamani, M.; Suresh, J.; Lingaraj, R.
In recent years, environmentally friendly methods have garnered significant attention in developing novel nanoparticles (NPs). This study focuses on the green synthesis and characterisation of CuO/MgO/ZnO NPs using Costus pictus D. Don Plant extract as a green reducing and capping agent. X-ray diffraction (XRD) analysis was employed to assess the purity of NPs, whereas Fourier-transform infrared (FTIR) and UV–Vis spectroscopy were employed to study the chemical composition and absorption peaks of the synthesised NPs. The Field-emission scanning electron microscopy (FE-SEM) images revealed a distinctive flower-like morphology of NPs, and their stability and dispersion were supported by a negative zeta potential of −14.8 mV. The significant surface area (87.742 m2/g) of CuO/MgO/ZnO NPs was obtained from Brunauer-Emmett-Teller (BET) analysis. Transmission electron microscopy (TEM) and selected area electron diffraction (SAED) analysis confirmed that the particle size of NPs is nearly 50 nm and is poly-crystalline. Finally, the synthesised NPs were tested against the bacteria using the agar-well diffusion method. Notably, CuO/MgO/ZnO NPs exhibited better antibacterial activity against Pseudomonas aeruginosa, yielding a substantial inhibition zone of 23.33 ± 2.08 mm. © 2024 Elsevier B.V.
Green synthesis of fe/ni/cr oxide nanoparticles using costus pictus plant extract: Microstructure and biological properties
(World Scientific, 2024) Kumar, P.; Ramesh, M.R.; Doddamani, M.; Suresh, J.
Superior qualities to bulk material and larger surface area to volume ratio are some of the primary reasons that account for the wide use of nanoparticles (NPs) in biological applications. Advancements in molecular-level engineering and environmental and health concerns are driving factors in the green synthesis of NPs. Plant-based NP synthesis provides a good alternative compared to hazardous physical and chemical techniques of synthesis of NPs. An experimental study is carried out on the green synthesis of Fe/Ni/Cr oxide NPs using Costus pictus extract. The study encompassed an array of characterization techniques, including UV-visible spectroscopy for absorption properties, X-ray diffraction (XRD) for crystallinity assessment, and Fourier-transform infrared (FTIR) spectroscopy to probe the presence of phenolic groups in flavonoids that influence NP formation. Surface morphology and composition were elucidated using scanning electron microscopy (SEM) with energy-dispersive spectroscopy (EDS), while transmission electron microscopy (TEM) affirmed the NPs' size (approximately 20 nm). The surface area of the NPs, 96.806 m2/g, was determined through BET analysis. Furthermore, the antibacterial potential of the NPs against various bacterial strains, including S. mutans, E. coli, P. aeruginosa, and S. aureus, was investigated using the agar well diffusion method. The NPs showed good antibacterial potential against bacterial species E. coli and P. aeruginosa. © 2024 World Scientific Publishing Company.
Plant (Costus Pictus D. Don) Assisted Green Synthesis of Double Oxide Nanoparticles for Antibacterial Applications
(Springer Science and Business Media Deutschland GmbH, 2024) Kumar, P.; Ramesh, M.R.; Doddamani, M.; Suresh, J.
The present study focuses on synthesising CuO-MgO, CuO-ZnO, and MgO-ZnO double oxide nanoparticles (NPs) using the Costus pictus (insulin plant), offering an eco-friendly and cost-effective method. Comprehensive characterisation of the synthesised NPs was performed, including UV-visible spectroscopy (UV-Vis), Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Field emission scanning electron microscopy (FESEM) with energy-dispersive X-ray spectroscopy (EDS), elemental mapping, Brunauer-Emmett-Teller (BET) analysis, and measurement of Zeta potential. The UV-Vis studies verified NP absorption, while FTIR confirmed the presence of functional groups. XRD analysis validated nanoparticle purity and crystal structure, disclosing crystalline sizes of 19.59 nm (CuO-MgO), 27.59 nm (CuO-ZnO), and 30.04 nm (MgO-ZnO) using Debye-Scherrer’s equation. SEM images visually confirmed sizes within the 50–200 nm range. BET analysis revealed specific surface areas (SSA) of 48.69 m2/g (CuO-MgO), 16.59 m2/g (CuO-ZnO), and 10.95 m2/g (MgO-ZnO). CuO-ZnO displayed the highest stability with a Zeta potential value of -22.0 mV. Moreover, the antibacterial activity of the NPs against S. mutans, E. coli, P. aeruginosa, and S. aureus was evaluated using the agar well diffusion method. The results indicated that CuO-MgO and CuO-ZnO exhibited enhanced antibacterial responses against P. aeruginosa (19.5 ± 0.71 mm) and S. mutans (19.67 ± 0.58 mm), respectively, potentially attributed to their significant surface areas. This study highlights the synthesis and potential of CuO-MgO, MgO-ZnO, and CuO-ZnO NPs as promising antibacterial agents for biomedical applications. © The Tunisian Chemical Society and Springer Nature Switzerland AG 2024.