Abstract:This study was aimed to synthesize zinc oxide nanoparticles from the aqueous peel extract of Aloe vera and assess their antimicrobial activity against pathogenic bacteria and fungi. The nanoparticles were characterized by UV-Vis spectroscopy, Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Scanning electron microscopy (SEM) and transmission electron microscopy (TEM). UV-Vis spectroscopic analysis confirmed the synthesis of zinc oxide nanoparticles. Fourier transform infrared spectrosco… Show more
“…2), which is most likely the characteristic feature of ZnO NPs. Likewise, several biological ZnO NPs synthesized by various green sources such as Ixora Coccinea 22 , and Aloe vera 23 extracts have revealed comparable absorption peaks for bio-assisted ZnO nanoparticles.Figure 2UV–visible spectra of ( a ) initial Chlorella aqueous extract and final ZnO NPs solution ( b ); inset shows visual observations of color changes.…”
A novel eco-friendly procedure was developed to produce safer, stable and highly pure zinc oxide nanoparticles (ZnO NPs) using microalgae Chlorella extract. The ZnO NPs were synthesized simply using zinc nitrate and microalgae Chlorella extract which conducted at ambient conditions. In this recipe, microalgae Chlorella extract acted as the reducing agent and a stabilizing layer on fresh ZnO NPs. UV–visible spectrum was confirmed the formation of ZnO NPs showing an absorption peak at 362 nm. XRD results demonstrated that prepared ZnO NPs has a high-crystalline hexagonal (Wurtzite) structure, with average size about 19.44 nm in diameter. FT-IR spectral analysis indicated an active contribution of algae-derived biomolecules in zinc ions bioreduction. According to SEM and TEM observations, ZnO NPs are well dispersed and has a hexagonal shape with the average size of 20 ± 2.2 nm, respectively. Based on gas chromatography analyses, the optimum 0.01 g/L dosage of ZnO catalyst revealed an effective photocatalytic activity toward the degradation (97%) of Dibenzothiophene (DBT) contaminant as an organosulfur model in the neutral pH at the mild condition. Rapid separation and facile recyclability at five consecutive runs were demonstrated high efficiency and durability of green ZnO nanophotocatalyst. The possible mechanisms of green ZnO NPs formation and the photo-desulfurization of DBT were also proposed.
“…2), which is most likely the characteristic feature of ZnO NPs. Likewise, several biological ZnO NPs synthesized by various green sources such as Ixora Coccinea 22 , and Aloe vera 23 extracts have revealed comparable absorption peaks for bio-assisted ZnO nanoparticles.Figure 2UV–visible spectra of ( a ) initial Chlorella aqueous extract and final ZnO NPs solution ( b ); inset shows visual observations of color changes.…”
A novel eco-friendly procedure was developed to produce safer, stable and highly pure zinc oxide nanoparticles (ZnO NPs) using microalgae Chlorella extract. The ZnO NPs were synthesized simply using zinc nitrate and microalgae Chlorella extract which conducted at ambient conditions. In this recipe, microalgae Chlorella extract acted as the reducing agent and a stabilizing layer on fresh ZnO NPs. UV–visible spectrum was confirmed the formation of ZnO NPs showing an absorption peak at 362 nm. XRD results demonstrated that prepared ZnO NPs has a high-crystalline hexagonal (Wurtzite) structure, with average size about 19.44 nm in diameter. FT-IR spectral analysis indicated an active contribution of algae-derived biomolecules in zinc ions bioreduction. According to SEM and TEM observations, ZnO NPs are well dispersed and has a hexagonal shape with the average size of 20 ± 2.2 nm, respectively. Based on gas chromatography analyses, the optimum 0.01 g/L dosage of ZnO catalyst revealed an effective photocatalytic activity toward the degradation (97%) of Dibenzothiophene (DBT) contaminant as an organosulfur model in the neutral pH at the mild condition. Rapid separation and facile recyclability at five consecutive runs were demonstrated high efficiency and durability of green ZnO nanophotocatalyst. The possible mechanisms of green ZnO NPs formation and the photo-desulfurization of DBT were also proposed.
“…In a previous study, Akbar et al [ 33 ] synthesized 20 nm-sized zinc oxide nanoparticles that were tested against Salmonella typhimurium and Staphylococcus aureus , and reported that the nanoparticles showed potent antimicrobial effects against the tested bacteria. Salem et al [ 14 ] also evaluated the antimicrobial effects of zinc oxide nanoparticles against Vibrio cholera and enterotoxic Escherichia coli , while Chaudhary et al [ 34 ] assessed the antimicrobial effect of zinc oxide nanoparticles against the following pathogenic organisms: Staphylococcus epidermidis (MTCC-3382), Staphylococcus epidermidis (MTCC-3382), Klebsiella pneumoniae (MTCC-3384), Escherichia coli (MTCC-41) and fungi, Aspergillus niger (MTCC-404) and Aspergillus oryzae (MTCC-3107).…”
This study assessed the antimicrobial efficacy of synthesized zinc oxide nanoparticles produced using aqueous extracts of pomegranate leaves and flowers designated ZnO-NPs-PL, ZnO-NPs-PF. In the study, oxides of zinc were successfully employed to fabricate nanoparticles using extracts from leaves and flowers of pomegranate (Punica granatum). The nanoparticles obtained were characterized spectroscopically. X-ray diffractive analysis (XRD) revealed the elemental components and nature of the synthesized particles. The fabricated zinc oxide nanoparticle (ZnO-NPs) showed a crystalline structure. The morphology of the nanoparticles as shown by scanning electron microscopy (SEM) was unevenly spherical and the functional groups involved in stabilization, reduction and capping were confirmed using Fourier Transform Infra-Red (FT-IR) Spectroscopy. Confirmation of the nanoparticles by UV–Vis analysis showed absorption bands of 284 and 357 nm for pomegranate leaf and flower extract, respectively, mediated ZnO-NPs. Evaluation of the antimicrobial efficacy of the fabricated nanoparticles showed that ZnO-NPs were effective against all selected pathogenic strains, Staphylococcus aureus, Bacillus cereus, Pseudomonas aeruginosa, Klebsiella pneumoniae, Streptococcus pneumoniae, Salmonella diarizonae, Salmonella typhi, Enterococcus faecalis, Enterococcus faecium, Escherichia coli, Moraxella catarrhalis, Aeromonas hydrophila and Listeria monocytogenes, used in the analysis. The effectiveness of these nanoparticles could be linked to their sizes and shapes as obtained using a transmission electron microscope (TEM) and scanning electron microscope (SEM). Our reports revealed that increasing the concentration of the nanoparticles resulted in an increase in the antibacterial activity exerted by the nanoparticles, thus suggesting that both ZnO-NPs can effectively be used as alternative antibacterial agents. Further research is required to assess their mechanisms of action and toxicity.
“…In the last decade several papers reported for biosynthesis of zinc oxide nanoparticles (ZnONPs) from plants (Rao, 2016;Choudhary, 2018). After reviewing previous literature we synthesized zinc oxide nanoparticles (ZnO NPs) from seed coat of almond.…”
Section: Resultsmentioning
confidence: 99%
“…Several papers have reported the biosynthesized zinc oxide nanoparticles have UV-vis absorption spectrum from 200 to 300nm with Nanodrop 2000c spectrophotometer (Themo Scienti c, Walthman MA, USA) (Choudhary, 2018). If we increase the concentration of extract then increase in wavelength up to 448 nm.…”
Zinc plays a key role in plants growth and application of Zinc can, therefore, contribute to crop yield improvement. Nowadays, nanoparticles have received high attention because to their novel properties. The current work is done with an aim to investigate the biosynthesis of zinc oxide nanoparticles (ZnO NPs) and effect on fungus Rhizoctonia solani and on carrot crop. Use of nanoparticles as a nano-fertilizer requires an understanding of nanoparticles impact on crop plants We have used seed coat of almond for the synthesis of zinc oxide nanoparticles (ZnO NPs) characterized by EDS, FTIR, SEM and TEM. Spray with 50ppm and 100 ppm caused significant increase in plant growth parameter of carrot plants. It has been reported that the synthesized ZnO NPs demonstrated an inhibitory activity against plant pathogenic fungi R. solani. Antifungal efficiency of ZnONPs was further explained with help of Molecular docking analysis. Confirmation of the least binding energy was used to predict binding site of receptor with NPs to know mechanistic approach. ZnONPs are likely to interact with the pathogens by mechanical enfolding which may be one of the major toxicity actions against R. solani by ZnONPs.
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