“…In the present study, a sharp absorption peak obtained at 369nm clearly marked the bio-synthesis of B. pinnatum leaf extract mediated ZnONPs ( Figure 3 ). Similar peaks have been reported in earlier studies also, where different plant parts like the flower extract of Nyctanthes arbor-tristis , leaf extract of Justicia procumbense and the shell extract of Punica granatum have been exploited to produce ZnO nanoparticles, wherein sharp absorption peaks at 365 nm, 370 nm and 370 nm, respectively, have been reported [ 34 , 35 , 36 , 37 ]. Figure 3 UV-Vis spectra of synthesized ZnO nanoparticles.…”
“…In the present study, a sharp absorption peak obtained at 369nm clearly marked the bio-synthesis of B. pinnatum leaf extract mediated ZnONPs ( Figure 3 ). Similar peaks have been reported in earlier studies also, where different plant parts like the flower extract of Nyctanthes arbor-tristis , leaf extract of Justicia procumbense and the shell extract of Punica granatum have been exploited to produce ZnO nanoparticles, wherein sharp absorption peaks at 365 nm, 370 nm and 370 nm, respectively, have been reported [ 34 , 35 , 36 , 37 ]. Figure 3 UV-Vis spectra of synthesized ZnO nanoparticles.…”
“…Alcohols, phenolics, carboxylic groups, and other OH stretching vibrations are associated with the spectrum [4,10,15]. When compared to the spectra of khat (Catha edulis) leaf extract, the intensity of this spectrum is reduced and its location is shifted [36,52]. The reason for the reduction of the spectra is due to the fact that the phytochemicals such as alcohols, flavones, and carboxylic groups are involved for the reduction of Zn 2+ to ZnO nanoparticles [10,36].…”
In this study, we used khat (Catha edulis) leaf extract as a reducing and stabilizing agent for the biosynthesis of zinc oxide nanoparticles (ZnO NPs). The rapid color change of the solution to pale yellow and UV-visible absorption peak at 322 nm confirmed the initial formation of ZnO NPs. FTIR spectrum analysis revealed the contribution of khat leaf extract to the bioreduction of Zn2+ ions to ZnO NPs. The FTIR spectrum for the stretching vibration of ZnO at 480 cm-1 also confirms the formation of ZnO NPs. The XRD spectrum showed the crystallinity and the hexagonal wurtzite structure of ZnO NPs. The size of the synthesized ZnO NPs calculated using the Debye-Scherrer formula was found to be equal to 17 nm. Antibacterial efficacy of green-produced zinc oxide nanoparticles against Gram-positive and Gram-negative microorganisms was tested. It has the greatest inhibition zone (23 mm) against E. coli, but the least activity was against S. pneumoniae (15 mm).
“…However, the bandgap decrease, whereas relatively increases the better conductivity. Similarly, Justicia procumbense and Rubia cordifolia mediated ZnO nanoparticles showed an absorption peak at 370 and 374 nm ( Umavathi et al, 2020 , Sisubalan et al, 2018 ). The present result matched these results.…”
Section: Discussionmentioning
confidence: 99%
“…Consequently, cell wall-bounded ZnO nanoparticles cause pith formation of the microbial cell wall and loss the cell membrane integrity ( Umavathi et al, 2020 , Kim et al, 2020 , Viswanathan et al, 2020 ). Whereas Zn 2+ ions penetrated to the cytosol and binding with sulfur-containing amino acids, interference the bio-signaling affected the DNA replication, inactivated the electron transport chain, and reduced the ATP synthesis, causes mesosoma oxidative stress and mitochondrial oxidative stress.…”
The present work aims to synthesize zinc oxide (ZnO) nanoparticles via green approaches using leaf extract of
Parthenium hysterophorus
. UV–vis and FT-IR tests confirmed the existence of biomolecules, active materials, and metal oxides. The X-ray diffraction structural study exposes the ZnO nanoparticles formation with hexagonal phase structures. SEM and TEM analysis reveal surface morphologies of ZnO nanoparticles and most of them are spherical with a size range of 10 nm. ZnO nanoparticles were revealed strong antimicrobial activity against both bacterial and fungal strains. The germination of seeds and vegetative growth of
Sesamum indicum
has been greatly improved.
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