Abstract
In present study, copper oxide nanoparticles (CuONPs) synthesized by quick and eco-friendly phytogenicreduction of copper salt (copper sulphate CuSO4.H2O) solution with Pterocarpus marsupium extract. UV-VIS spectrometry indicated formation of nanoparticles via absorption spectra of copper colloidal solution at 442 nm. Phytosynthesis of CuONPs were further characterized by Transmission electron microscopy; scanning electron microscopy and Fourier transform infrared spectroscopy. The experimental results showed that diameter of CuONPs in colloidal solution were < 40 nm. Further, antibacterial activities of CuONPs were determined against Gram negative Escherichia coli- MTCC-9721, Proteus vulgaris- MTCC-7299, Klebsiella pneumonia- MTCC-9751 and Gram positive i.e. Staphylococcus aureus- MTCC-9442, Staphylococcus. epidermidis- MTCC- 2639, Bacillus cereus- MTCC-9017 bacteria by well agar diffusion and microdilution method. Notably, The CuONPs showed an effective antibacterial activity against all test microorganisms where K. pneumonia and E.coli showed maximum ZOI and MIC respectively i.e. 24 mm and 6 μg/ml.
Highlights
Copper and its complexes have been used as water purifiers, algaecide, fungicides, and as antibacterial and antifouling agents [1,2]
Marsupium extracts to copper sulphate solution turned the solution to green color at 50°C confirmed formation of CuONPs (Figure 1)
Synthesis of CuONPs using extract of heart-wood of P. marsupium observed by UV-visible spectroscopy
Summary
Copper and its complexes have been used as water purifiers, algaecide, fungicides, and as antibacterial and antifouling agents [1,2]. In last decade metal is being tried set to minimal size of particles as nanoparticles due to idiosyncratic properties. CuONPs exhibited huge potential as catalysis, optics, electronics, batteries, gas sensors, solar energy conversion tools, high temperature superconductors [3,4,5,6,7] and found very persuasive in past studies, evaluating antibacterial activity and roles in other ailment [8,9]. Synthesis of metallic nanoparticles is carried out by several physical and chemical methods that include laser ablation [13], ion sputtering [14], solvo thermal synthesis [15], chemical reduction [16], and sol-gel [17,18] method, involve toxic solvents, high temperature, energy and high pressure conversion. Parts of the Indian Kino (heartwood, leaves and flowers) have long been used for their medicinal properties in Ayurveda
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