LAUSR

AbstractPentagon copper oxide (CuO) nanoplatelets formation employing Nephelium lappaceum L. extract was successfully developed. Characteristic X-ray diffraction peaks revealed a monoclinic and end-centered lattice structure of copper oxide belonging to 1C62h (c2/c) space group. Three characteristic Raman peaks, Ag, Bg(1) and Bg(2), confirmed the monoclinic CuO structure. The pentagon CuO nanoplatelets formation increased proportionally with increase in calcination temperature from 600 to 800 °C and the particle size was noticeably increased from 30 to 250 nm. Strong photoluminescence emission peak was noticed in the UV region between 377 and 393 nm. The metal–oxygen Cu2+–O2− vibration of the synthesized product in the range between 300 and 700 cm−1 was confirmed using infrared studies. The CuO product obtained at 600 °C showed best antibacterial action due to its small particle size (30–60 nm) against both Gram-positive and Gram-negative bacteria. The obtained product cell morphology, proliferation and viability test were investigated with respect to control and 10, 50, 100, and 500 μg/ml. Cell viability of the product were respectively 74, 55.3, 50, and 27.3% and found suitable for biomedical applications. HighlightsBiologic-mediated pentagon CuO nanoplatelets developed.Mechanism of copper-ellagate complex formation was proposed.10, 50, 100 and 500 μg/ml cell viability were 74, 55.3, 50 and 27.3%.