scholarly journals Statistical optimization of experimental parameters for extracellular synthesis of zinc oxide nanoparticles by a novel haloalaliphilic Alkalibacillus sp.W7

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hend M. H. Al-Kordy ◽  
Soraya A. Sabry ◽  
Mona E. M. Mabrouk
Keyword(s):  
Zinc Oxide ◽  
Zinc Oxide Nanoparticles ◽  
Visible Spectrum ◽  
Spherical Shape ◽  
Hexagonal Wurtzite Structure ◽  
Oxide Nanoparticles ◽  
Elemental Distribution ◽  
Zno Nps ◽  
X Ray ◽  
Stabilizing Agents

AbstractGreen synthesis of zinc oxide nanoparticles (ZnO NPs) through simple, rapid, eco-friendly and an economical method with a new haloalkaliphilic bacterial strain (Alkalibacillus sp. W7) was investigated. Response surface methodology (RSM) based on Box-Behnken design (BP) was used to optimize the process parameters (ZnSO4.7H2O concentration, temperature, and pH) affecting the size of Alkalibacillus-ZnO NPs (Alk-ZnO NPs). The synthesized nanoparticles were characterized using UV–visible spectrum, X-ray diffraction (XRD), Scanning electron microscope-energy dispersive X-ray spectroscopy (SEM–EDX), Transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR) and Zeta potential. The UV–Vis spectrum of ZnO NPs revealed a characteristic surface plasmon resonance (SPR) peak at 310 nm. XRD pattern confirmed the hexagonal wurtzite structure of highly pure with a crystallite size 19.5 nm. TEM proved the quasi-spherical shape nanoparticles of size ranging from 1 to 30 nm. SEM–EDX showed spherical shaped and displayed a maximum elemental distribution of zinc and oxygen. FTIR provided an evidence that the biofunctional groups of metabolites in Alkalibacillus sp.W7 supernatant acted as viable reducing, capping and stabilizing agents.

scholarly journals Biosynthesis of Zinc Oxide Nanoparticles from Acacia nilotica (L.) Extract to Overcome Carbapenem-Resistant Klebsiella Pneumoniae

Molecules ◽  
2021 ◽  
Vol 26 (7) ◽  
pp. 1919
Author(s):  
Elsayim Rasha ◽  
AlOthman Monerah ◽  
Alkhulaifi Manal ◽  
Ali Rehab ◽  
Doud Mohammed ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Zinc Oxide ◽  
Klebsiella Pneumoniae ◽  
Zinc Oxide Nanoparticles ◽  
Acacia Nilotica ◽  
Oxide Nanoparticles ◽  
Zno Nps ◽  
X Ray ◽  
Carbapenem Resistant

Recently, concerns have been raised globally about antimicrobial resistance, the prevalence of which has increased significantly. Carbapenem-resistant Klebsiella pneumoniae (KPC) is considered one of the most common resistant bacteria, which has spread to ICUs in Saudi Arabia. This study was established to investigate the antibacterial activity of biosynthesized zinc oxide nanoparticles (ZnO-NPs) against KPC in vitro and in vivo. In this study, we used the aqueous extract of Acacia nilotica (L.) fruits to mediate the synthesis of ZnO-NPs. The nanoparticles produced were characterized by UV-vis spectroscopy, zetasizer and zeta potential analyses, X-ray diffraction (XRD) spectroscopy, Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and transmission electron microscopy (TEM). The antimicrobial activity of ZnO-NPs against KPC was determined via the well diffusion method, and determining minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC), the results showed low MIC and MBC when compared with the MIC and MBC of Imipenem and Meropenem antibiotics. The results of in vitro analysis were supported by the results upon applying ZnO-NP ointment to promote wound closure of rats, which showed better wound healing than the results with imipenem ointment. The biosynthesized ZnO-NPs showed good potential for use against bacteria due to their small size, applicability, and low toxicity to human cells.

scholarly journals Scolicidal activity of biosynthesized zinc oxide nanoparticles by Mentha longifolia L. leaves against Echinococcus granulosus protoscolices

2021 ◽  
Author(s):  
Bushra H. Shnawa ◽  
Samir M. Hamad ◽  
Azeez A. Barzinjy ◽  
Payman A. Kareem ◽  
Mukhtar H. Ahmed
Keyword(s):  
Zinc Oxide ◽  
Zinc Oxide Nanoparticles ◽  
Public Health Problem ◽  
Analytical Techniques ◽  
Oxide Nanoparticles ◽  
Zno Nps ◽  
Leaf Extracts ◽  
X Ray ◽  
Morphological Alterations ◽  
Mentha Longifolia

AbstractCystic echinococcosis is a public health problem in developing countries that practice sheep breeding extensively. In the current study, the protoscolicidal activity of biosynthesized zinc oxide nanoparticles (ZnO NPs) derived from Mentha longifolia L. leaf extracts was investigated. The resultant ZnO NPs were characterized by means of various analytical techniques, such as ultraviolet–visible (UV–Vis) spectrometry, Fourier transform infrared (FT-IR) spectrophotometry, X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDX) analysis. The results showed that the ZnO NP had the highest scolicidal activity at 400 ppm concentration after 150 min of exposure time, showing 100% mortality rate. The treated protoscolices exhibited loss of viability with several morphological alterations. Hence, an easy and effective green synthesis of ZnO NPs, with efficient scolicidal potential, is reported in this study.

scholarly journals Thermophysiological comfort of zinc oxide nanoparticles coated woven fabrics

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Muhammad Tayyab Noman ◽  
Michal Petru ◽  
Nesrine Amor ◽  
Petr Louda
Keyword(s):  
Surface Roughness ◽  
Zinc Oxide ◽  
Surface Topography ◽  
Zinc Oxide Nanoparticles ◽  
Air Permeability ◽  
Woven Fabrics ◽  
Oxide Nanoparticles ◽  
Zno Nps ◽  
X Ray ◽  
Moisture Management

AbstractThis study investigates physicochemical impact of ultrasonic irradiations on surface topography of woven fabrics. In a simultaneous in-situ sonochemical method, the synthesis and coating of zinc oxide nanoparticles (ZnO NPs) on woven textiles were successfully achieved. Different instruments i.e. Alambeta, moisture management tester, air permeability tester and permetester were utilised during experimentation for thermal evaluation, moisture transportation and air permeation. The results regarding thermophysiological comfort of ZnO coated fabrics were evaluated on the basis of thickness and ZnO NPs coated amount on fabrics. In addition, the achieved results depict the impact of sonication (pressure gradient) on surface roughness of cotton and polyester. The coating of ZnO NPs on fabrics, crystal phase identification, surface topography and fluctuations in surface roughness were estimated by inductively coupled plasma atomic emission spectroscopy (ICP-AES), X-ray Diffractometry (XRD), ultrahigh-resolution scanning electron microscopy (UHR-SEM) and energy dispersive X-ray (EDX). Moreover, thermophysiological properties i.e. thermal conductivity, absolute evaporative resistance, thermal absorptivity, air permeability, overall moisture management capacity and relative water vapour permeability of untreated and ZnO treated samples were evaluated by standard test methods.

scholarly journals Effects of Zinc Oxide Nanoparticles Synthesized Using Aspergillus niger on Carbapenem-Resistant Klebsiella pneumonia In Vitro and In Vivo

2021 ◽  
Vol 11 ◽  
Author(s):  
Elsayim Rasha ◽  
Manal M. Alkhulaifi ◽  
Monerah AlOthman ◽  
Ibrahim Khalid ◽  
Elnagar Doaa ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Aspergillus Niger ◽  
Zinc Oxide Nanoparticles ◽  
Diffusion Method ◽  
Oxide Nanoparticles ◽  
Zno Nps ◽  
X Ray ◽  
Carbapenem Resistant

Currently, the mortality rate in Saudi Arabia’s ICUs is increasing due to the spread of Klebsiella pneumoniae carbapenemase (KPC)-producing bacteria. This study was carried out to evaluate the ability of biologically synthesized zinc oxide nanoparticles (ZnO-NPs) using Aspergillus niger to overcome carbapenem-resistant K. pneumoniae (KPC) in vitro and in vivo. ZnO-NPs were synthesized via a biological method and characterized using UV–Vis spectroscopy, Zetasizer and zeta potential analyses, x-ray diffraction spectroscopy, Fourier transform infrared spectroscopy, scanning electron microscopy (SEM), and energy-dispersive x-ray spectroscopy (EDX). In vitro sensitivity of KPC to ZnO-NPs was identified using the well diffusion method. The minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) were determined by a macro-dilution method. The morphological alteration of KPC cells after ZnO-NPs treatment was observed by SEM. The in vivo susceptibility of KPC cells to ZnO-NPs ointment was evaluated using wound healing in experimental rats. The chemical characterization findings showed the formation, stability, shape, and size of the synthesized nanoparticles. The MIC and MBC were 0.7 and 1.8 mg/ml, respectively. The in vivo results displayed reduced inflammation and wound re-epithelialization of KPC-infected rats. These findings demonstrated that ZnO-NPs have great potential to be developed as antibacterial agents.

Synthesis and Characterization of Onion Mediated Silver Doped Zinc Oxide Nanoparticles

2018 ◽  
pp. 111-120 ◽  
Author(s):  
N. Tensingh Baliah ◽  
Muthulakshmi P. ◽  
S. Lega Priyatharsini
Keyword(s):  
Zinc Oxide ◽  
Zinc Oxide Nanoparticles ◽  
Good Alternative ◽  
Oxide Nanoparticles ◽  
Zno Nps ◽  
X Ray ◽  
Synthesis Of Nanoparticles ◽  
Onion Extract ◽  
Operation Conditions ◽  
Doped Zno

Green synthesis of nanoparticles has attracted considerable attention in recent years. In this regard, plants extracts and natural resources such as microorganisms and enzymes have been found to be good alternative reagents in nanoparticles synthesis. Utilizing green substances has several advantages including low energy consumption and moderate operation conditions without using any toxic chemicals. An attempt was made to synthesis and characterizes the silver doped zinc oxide nanoparticles (Ag doped ZnO NPs) by using onion extract. The synthesized Ag doped ZnO NPs were characterized by Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Spectroscopy Analysis (EDAX), Fourier Transform Infrared Spectroscopy (FTIR), X-Ray Diffraction (XRD) and Zeta potential analyses. These characterizations revealed that doped nanoparticles are differed in their structural properties. The onion extract was used as reducing agent as well as stabilizer. The phytochemicals found in the onion extract were responsible for the formation of Ag doped ZnO NPs.

scholarly journals Insecticidal effects of zinc oxide nanoparticles and Beauveria bassiana TS11 on Trialeurodes vaporariorum (Westwood, 1856) (Hemiptera: Aleyrodidae)

2016 ◽  
Vol 107 (2) ◽  
pp. 299 ◽  
Author(s):  
Zahra KHOOSHE-BAST ◽  
Najmeh Sahebzadeh ◽  
Mansour GHAFFARI-MOGHADDAM ◽  
Ali MIRSHEKAR
Keyword(s):  
Zinc Oxide ◽  
Beauveria Bassiana ◽  
Zinc Oxide Nanoparticles ◽  
Hexagonal Wurtzite Structure ◽  
Trialeurodes Vaporariorum ◽  
Precipitation Method ◽  
Infrared Analysis ◽  
Oxide Nanoparticles ◽  
Zno Nps ◽  
Greenhouse Whitefly

<p><em></em>Greenhouse whitefly,<em> Trialeurodes vaporariorum</em> is a major pest of horticultural and ornamental plants and is usually controlled with insecticides or biological control agents. In the current study, we examined the effects of synthesized zinc oxide nanoparticles (ZnO NPs) and <em>Beauveria bassiana</em> TS11 on <em>T. vaporariorum</em> adults. ZnO NPs were synthesized by precipitation method. Field emission scanning electron microscope images indicated that ZnO NPs were non-compacted uniformly. X-ray diffraction results confirmed the hexagonal wurtzite structure of ZnO NPs. Fourier transform infrared analysis showed an intense absorption peak at a range of 434-555 cm<sup>-1</sup> related to Zn-O bond. In bioassays, adults were exposed to different concentrations of ZnO NPs (3, 5, 10, 15, 20 mg l<sup>-1</sup>) and fungi (10<sup>4</sup>, 10<sup>5</sup>, 10<sup>6</sup>, 10<sup>7</sup>, 10<sup>8</sup> spores ml<sup>-1</sup>). LC<sub>50</sub> values for ZnO NPs and fungi were 7.35 mg l<sup>-1</sup>and 3.28×10<sup>5</sup> spores ml<sup>-1</sup>, respectively. Mortality rates obtained with ZnO NPs and fungi at the highest concentration were 91.6 % and 88.8 %, respectively. The results indicate a positive effect of ZnO NPs and <em>B. bassiana </em>TS11on adults. The current study was conducted under laboratory conditions, therefore, more studies are needed in field.</p>

scholarly journals Green Synthesis, Characterization and Antimicrobial Activity of Zinc Oxide Nanoparticles on Clinical Isolates of Streptococcus pyogenes

2020 ◽  
Vol 32 (4) ◽  
pp. 907-911
Author(s):  
S. Akash ◽  
N. Ahalya ◽  
P. Dhamodhar
Keyword(s):  
Zinc Oxide ◽  
Band Gap ◽  
Streptococcus Pyogenes ◽  
Zinc Oxide Nanoparticles ◽  
Hexagonal Phase ◽  
Combustion Method ◽  
Oxide Nanoparticles ◽  
Zno Nanoparticle ◽  
Zno Nps ◽  
X Ray

Zinc oxide nanoparticles were synthesized using epicarp of Punica granatum by combustion method at moderate temperatures. Zinc oxide nanoparticles obtained in agglomerate form were characterized by powder X-ray diffractometer (PXRD) and found to have hexagonal phase, wurtzite structure. The crystalline size of nanoparticle was found to be ~ 60 nm by using Debye-Scherrer formula. The morphology Index, Lorentz factor and Lorentz polarization factor were also calculated. Ultraviolet-visible spectroscopy (UV-vis) spectrum for ZnO nanoparticle showed a strong absorbance at 374 nm. This corresponds to the calculated band gap energy of 3.48 eV and the particle size calculated using band gap was found to be 50 nm. The Fourier Transform Infrared Spectroscopy (FTIR) spectrum showed a peak at 499 cm-1, which indicated Zn-O stretch bond. The scanning electron microscopy (SEM) analysis proved the size of nanoparticles synthesized were around 50 nm and energy dispersive X-ray spectroscopy (EDS) revealed the elemental composition of zinc oxide nanoparticles. The ZnO-NPs were evaluated for antibacterial activity against gram positive, tonsillitis causing Streptococcus pyogenes. From the present study, it was concluded that zinc oxide nanoparticles synthesized by combustion method could be valuable and economic in the field of nanotechnology.

scholarly journals Optical and Structural Properties of ZnO Nanoparticles Synthesized by CO2 Microwave Plasma at Atmospheric Pressure

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Se Min Chun ◽  
Dae Hyun Choi ◽  
Jong Bae Park ◽  
Yong Cheol Hong
Keyword(s):  
Zinc Oxide ◽  
Atmospheric Pressure ◽  
Zinc Oxide Nanoparticles ◽  
Microwave Plasma ◽  
Hexagonal Phase ◽  
Visible Spectrum ◽  
High Energy ◽  
Oxide Nanoparticles ◽  
X Ray ◽  
Carbon Doped

The results of carbon-doped zinc oxide nanoparticles synthesized by CO2 microwave plasma at atmospheric pressure are presented. The 2.45-GHz microwave plasma torch and feeder for injecting Zn granules are used in the synthesis of zinc oxide nanoparticles. The Zn granules (13.5 g/min) were introduced into the microwave plasma by CO2 (5 l/min) swirl gas. The microwave power delivered to the CO2 microwave plasma was 1 kW. The synthesis of carbon-doped zinc oxide nanoparticles was carried out in accordance with CO2 + Zn → carbon-doped ZnO + CO. The synthesized carbon-doped zinc oxide nanoparticles have a high purity hexagonal phase. The absorption edge of carbon-doped zinc oxide nanoparticles exhibited a red shift from a high-energy wavelength to lower in the UV-visible spectrum, due to band gap narrowing. A UV-NIR spectrometer, X-ray diffraction, emission scanning electron-microscopy, energy dispersive X-ray microanalysis, Fourier transform infrared spectroscopy, and a UV-Vis-NIR spectrophotometer were used for the characterization of the as-produced products.

Plant-Mediated Green Synthesis of Zinc Oxide Nanoparticles Using Peel Extract of Citrus reticulate for Boosting Seed Germination of Brassica nigra Seeds

2021 ◽  
Vol 21 (6) ◽  
pp. 3573-3579
Author(s):  
Muhammad Rafique ◽  
Muhammad Sohaib ◽  
Rabbia Tahir ◽  
M. Bilal Tahir ◽  
M. Rizwan
Keyword(s):  
Zinc Oxide ◽  
Seed Germination ◽  
Zinc Oxide Nanoparticles ◽  
Brassica Nigra ◽  
Oxide Nanoparticles ◽  
Zno Nps ◽  
X Ray ◽  
Synthesis Of Nanoparticles ◽  
Citrus Reticulate ◽  
Peel Extract

High demand of food for rapidly increasing population requires novel but ecofriendly fertilizers. Green reducing and capping agents are being explored to minimize production cost and toxicity of chemicals in synthesis of nanoparticles (NPs) which could be used to increase the production of crops and plants. In present research, Zinc Oxide Nanoparticles (ZnO NPs) are produced by employing an eco-friendly, simple and efficient green route using peel extract of Citrus reticulate. The optical properties of green synthesized ZnO NPs are explored by UV-Visible and Photoluminance spectroscopies where NPs presented 3.21 to 3.13 eV band gap. The morphology and purity of the ZnO NPs are analyzed by scanning electron microscopy (SEM), X-ray diffraction technique (XRD) and energy dispersive X-ray spectroscopy (EDX), respectively. The spherical like ZnO NPs having 23–90 nm size exhibited hexagonal structure with 8.89 to 8.62 nm crystallite size. Fourier transform infrared spectroscopy (FTIR) explores the existence of specific functional groups which are responsible for stabilization, capping and reduction during synthesis of nanoparticles. The green synthesized ZnO NPs are tested for seed germination of Brassica nigra (black mustard) seeds at standard temperature and pressure. The activity shows that germination percentage of the Brassica nigra seeds is enhanced 100% and seedling vigor index 16.45 after treatment with ZnO NPs and can be controlled by the concentration of NPs. Therefore, it can be expected that ZnO NPs can serve as the cost effective and ecofriendly nano-fertilizers in agriculture.

Biosynthesis of ZnO Nanostructures Using Azadirachta indica Leaf Extract and Their Effect on Seed Germination and Seedling Growth of Tomato: An Eco-Friendly Approach

2020 ◽  
Vol 15 (11) ◽  
pp. 1412-1422
Author(s):  
Nishat Arshi ◽  
Y. Prashanthi ◽  
Tentu Nageswara Rao ◽  
Faheem Ahmed ◽  
Shalendra Kumar ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Seed Germination ◽  
Azadirachta Indica ◽  
Zno Nanoparticles ◽  
Zinc Oxide Nanoparticles ◽  
Leaf Extract ◽  
Oxide Nanoparticles ◽  
Zno Nps ◽  
X Ray ◽  
The Impact

In this study, we report synthesis of Zinc oxide nanoparticles using simple chemical and green methods. The ZnO nanoparticles were synthesized using leaf extract of Azadirachta indica (neem) as reducing agent. The as obtained product was characterized by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Energy dispersive X-ray analysis (EDAX) and TEM techniques. XRD analysis confirms that ZnO nanoparticles were crystalline having hexagonal Wurtzite structure with (1 0 0), (0 0 2), (1 0 1), (1 0 2), (1 1 0) and (1 1 2) planes. SEM analyses show that the as synthesized ZnO NPs were in the form of agglomerates and no other impurity peak was found in the EDS. TEM analyses confirm that the size of the nanoparticle was approx. 50 nm. Here in, we investigate the effect of chemical and green synthesized zinc oxide nanoparticles on germination and growth of lycopersicum esculentus (tomato) using petri plate seed germination method in loamy sand soil. The impact of concentration of applied ZnO nanoparticles via green synthesis and chemical methods were analyzed. Results revealed that green synthesized Zinc oxide nanoparticles showed maximum growth of seedling as compared to chemically synthesized Zinc oxide nanoparticles, bulk ZnO and control. After 50 days of tomato growth analysis, it was recognized that ZnO NPs can be a good green synthetic fertilizer by increasing shoot length, wet weight, dry weight and yield over conventional control. Hence, green method is found to be more effective.

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