Biosynthesis of ZnO nanoparticles using Jacaranda mimosifolia ﬂowers extract: Synergistic antibacterial activity and molecular simulated facet speciﬁc adsorption studies
Sabela, Myalowenkosi I.
Mdluli, Phumlane S.
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The naturally occurring biomolecules present in the plant extracts have been identiﬁed to play an active role in the single step formation of nanoparticles with varied morphologies and sizes which is greener and environmen-tally benign. In the present work, spherical zinc oxide nanoparticles (ZnO NPs) of 2–4 nm size were synthesized using aqueous extract of fallen Jacaranda mimosifolia ﬂowers (JMFs), treated as waste. The microwave assisted synthesis was completed successfully within 5 min. Thereafter, phase identiﬁcation, morphology and optical band gap of the synthesized ZnO NPs were done using X-ray diffraction (XRD), high resolution transmission elec-tron microscopy (HRTEM) and UV–Visible spectroscopy techniques. The composition of JMFs extract was ana-lyzed by gas chromatography–mass spectrometry (GC–MS) and the ZnO NPs conﬁrmation was further explored with fourier transform infrared spectroscopy (FTIR). The GC–MS results conﬁrmed the presence of oleic acid which has high propensity of acting as a reducing and capping agent. The UV–Visible data suggested an optical band gap of 4.03 eV for ZnO NPs indicating their small size due to quantum conﬁnement. Further, facet speciﬁc adsorption of oleic acid on the surface of ZnO NPs was studied computationally to ﬁnd out the im-pact of biomolecules in deﬁning the shape and size of NPs. The viability of gram negative Escherichia coli and gram positive Enterococcus faecium bacteria was found to be 48% and 43%, respectively at high concentration of NPs.
Sharma, D. et al. 2016. Biosynthesis of ZnO nanoparticles using Jacaranda mimosifolia ﬂowers extract: Synergistic antibacterial activity and molecular simulated facet speciﬁc adsorption studies. Journal of Photochemistry & Photobiology, B: Biology. 162: 199-207.