scholarly journals Green Synthesized ZnO Nanoparticles Mediated by Streptomyces plicatus: Characterizations, Antimicrobial and Nematicidal Activities and Cytogenetic Effects

Plants ◽  
2021 ◽  
Vol 10 (9) ◽  
pp. 1760
Author(s):  
Mohamed H. Kalaba ◽  
Saad A. Moghannem ◽  
Ahmad S. El-Hawary ◽  
Ahmed A. Radwan ◽  
Mohamed H. Sharaf ◽  
...  
Keyword(s):  
Erwinia Amylovora ◽  
Biological Activities ◽  
Seedling Development ◽  
Zno Nps ◽  
Cytogenetic Effects ◽  
Streptomyces Plicatus ◽  
Abnormality Index ◽  
Pathogenic Microbes ◽  
Absorbance Peak ◽  
Average Size

Zinc oxide nanoparticles (ZnO-NPs) are regarded as one of the most promising kinds of materials in a variety of fields, including agriculture. Therefore, this study aimed to biosynthesize and characterize ZnO-NPs and evaluate their different biological activities. Seven isolates of actinomycetes were obtained and screened for ZnO-NPs synthesis. The isolate MK-104 was chosen and identified as the Streptomyces plicatus MK-104 strain. The biosynthesized ZnO-NPs exhibited an absorbance peak at 350 nm and were spherical in shape with an average size of 21.72 ± 4.27 nm under TEM. XRD and DLS methods confirmed these results. The biosynthesized ZnO-NPs demonstrated activity against plant pathogenic microbes such as Erwinia amylovora, Aspergillus flavus, Aspergillus niger, Fusarium oxysporum, Fusarium moniliform and Alternaria alternata, with MIC values ranging from 15.6 to 500 µg/mL. Furthermore, ZnO-NPs had a significant effect on Meloidogyne incognita, with death percentages of 88.2, 93.4 and 96.72% after 24, 48 and 72 h of exposure, respectively. Vicia faba seeds were treated with five concentrations of ZnO-NPs (12.5, 25, 50, 100 and 200 µg/mL). Low-moderate ZnO-NP concentrations (12.5–50 µg/mL) were shown to promote seed germination and seedling development, while the mitotic index (MI) decreased as the dosage of ZnO-NPs increased. Micronuclei (MNs) and the chromosomal abnormality index increased as well.

The effect of silver concentration and calcination temperature on structural and optical properties of ZnO:Ag nanoparticles

2015 ◽  
Vol 29 (01) ◽  
pp. 1450254 ◽  
Author(s):  
M. Shayani Rad ◽  
A. Kompany ◽  
A. Khorsand Zak ◽  
M. E. Abrishami
Keyword(s):  
Calcination Temperature ◽  
Sol Gel ◽  
Visible Emission ◽  
X Ray Diffraction ◽  
Ag Nps ◽  
Zno Nps ◽  
Calcination Temperatures ◽  
Transmission Electron ◽  
Xrd Patterns ◽  
Average Size

Pure and silver added zinc oxide nanoparticles ( ZnO -NPs and ZnO : Ag -NPs) were synthesized through a modified sol–gel method. The prepared samples were characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM) and photoluminescence (PL) spectroscopy. In the XRD patterns, silver diffracted peaks were also observed for the samples synthesized at different calcination temperatures of 500°C, 700°C, 900°C except 1100°C, in addition to ZnO . TEM images indicated that the average size of ZnO : Ag -NPs increases with the amount of Ag concentration. The PL spectra of the samples revealed that the increase of Ag concentration results in the increase of the visible emission intensity, whereas by increasing the calcination temperature the intensity of visible emission of the samples decreases.

scholarly journals Green Synthesis of Gold and Silver Nanoparticles Using Leaf Extract of Clerodendrum inerme; Characterization, Antimicrobial, and Antioxidant Activities

Biomolecules ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 835 ◽  
Author(s):  
Shakeel Ahmad Khan ◽  
Sammia Shahid ◽  
Chun-Sing Lee
Keyword(s):  
Antioxidant Activities ◽  
Biological Activities ◽  
Radical Scavenging ◽  
Ag Nps ◽  
Gold And Silver Nanoparticles ◽  
Biofilm Inhibition ◽  
E Coli ◽  
Biocompatibility Test ◽  
Pathogenic Microbes ◽  
Dpph Scavenging

Due to their versatile applications, gold (Au) and silver (Ag) nanoparticles (NPs) have been synthesized by many approaches, including green processes using plant extracts for reducing metal ions. In this work, we propose to use plant extract with active biomedical components for NPs synthesis, aiming to obtain NPs inheriting the biomedical functions of the plants. By using leaves extract of Clerodendrum inerme (C. inerme) as both a reducing agent and a capping agent, we have synthesized gold (CI-Au) and silver (CI-Ag) NPs covered with biomedically active functional groups from C. inerme. The synthesized NPs were evaluated for different biological activities such as antibacterial and antimycotic against different pathogenic microbes (B. subtilis, S. aureus, Klebsiella, and E. coli) and (A. niger, T. harzianum, and A. flavus), respectively, using agar well diffusion assays. The antimicrobial propensity of NPs further assessed by reactive oxygen species (ROS) glutathione (GSH) and FTIR analysis. Biofilm inhibition activity was also carried out using colorimetric assays. The antioxidant and cytotoxic potential of CI-Au and CI-Ag NPs was determined using DPPH free radical scavenging and MTT assay, respectively. The CI-Au and CI-Ag NPs were demonstrated to have much better antioxidant in terms of %DPPH scavenging (75.85% ± 0.67% and 78.87% ± 0.19%), respectively. They exhibited excellent antibacterial, antimycotic, biofilm inhibition and cytotoxic performance against pathogenic microbes and MCF-7 cells compared to commercial Au and Ag NPs functionalized with dodecanethiol and PVP, respectively. The biocompatibility test further corroborated that CI-Ag and CI-Au NPs are more biocompatible at the concentration level of 1–50 µM. Hence, this work opens a new environmentally-friendly path for synthesizing nanomaterials inherited with enhanced and/or additional biomedical functionalities inherited from their herbal sources.

scholarly journals Lignin-Mediated Biosynthesis of ZnO and TiO2 Nanocomposites for Enhanced Antimicrobial Activity

2019 ◽  
Vol 3 (3) ◽  
pp. 90 ◽  
Author(s):  
Kanchan M. Samb-Joshi ◽  
Yogesh A. Sethi ◽  
Anuradha A. Ambalkar ◽  
Hiralal B. Sonawane ◽  
Suresh P. Rasale ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Antimicrobial Activity ◽  
Tio2 Nanoparticles ◽  
Phase Formation ◽  
Visible Region ◽  
Xrd Analysis ◽  
Structural Defects ◽  
Precipitation Method ◽  
Zno Nps ◽  
Average Size

In this work, we report the synthesis of fragmented lignin (FL) assisted zinc oxide (ZnO) and titanium oxide (TiO2) nanocomposites. The fragmented lignin synthesized from biomass (sugarcane bagasse) was used as a template to generate the morphology and crystallite structure of metal oxide nanomaterial. The nanocomposites were synthesized by a simple precipitation method, wherein fragmented lignin is used in alkaline medium as a template. X-ray diffraction (XRD) analysis shows the phase formation of hexagonal wurtzite ZnO and mixed phase formation of TiO2 as rutile and anatase. The morphology was studied by using field emission scanning electron microscopy (FE-SEM) and high-resolution transmission electron microscopy (HRTEM). The FE-SEM of pristine ZnO nanocomposites showed a cluster of particles whereas FL–ZnO NPs showed self-aligned nanoparticles in the form of rod shaped having average size 30–70 nm. Pristine TiO2 nanoparticles showed clusters of particles and FL–TiO2 nanocomposites showed well crystalline 41nm size nanocomposites. The FL acts as a surfactant which restrict the cluster formations. The band gap determined by diffuse reflectance spectra is 3.10 eV and 3.20 eV for FL–ZnO and FL–TiO2 nanocomposites, respectively. Photoluminescence spectra of both nanocomposites showed structural defects in the visible region. Further, the antimicrobial activity of pristine ZnO and TiO2 nanoparticles, and FL–ZnO and FL–TiO2 nanocomposites against Escherichia coli (ATCC25922), Staphylococcus aureus (ATCC25923) were studied under UV-A (315-400 nm) (8W) for 30min.

scholarly journals Effect of Biosynthesized ZnO Nanoparticles on Multi-Drug Resistant Pseudomonas Aeruginosa

Antibiotics ◽  
2020 ◽  
Vol 9 (5) ◽  
pp. 260 ◽  
Author(s):  
Syed Ghazanfar Ali ◽  
Mohammad Azam Ansari ◽  
Mohammad A. Alzohairy ◽  
Mohammad N. Alomary ◽  
Mohammad Jalal ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Pseudomonas Aeruginosa ◽  
Virulence Factors ◽  
Environmentally Friendly ◽  
Cost Effective ◽  
Multidrug Resistant ◽  
Zno Nps ◽  
Synthesis Of Nanoparticles ◽  
Transmission Electron ◽  
Average Size

Synthesis of nanoparticles using the plants has several advantages over other methods due to the environmentally friendly nature of plants. Besides being environmentally friendly, the synthesis of nanoparticles using plants or parts of the plants is also cost effective. The present study focuses on the biosynthesis of zinc oxide nanoparticles (ZnO NPs) using the seed extract of Butea monsoperma and their effect on to the quorum-mediated virulence factors of multidrug-resistant clinical isolates of Pseudomonas aeruginosa at sub minimum inhibitory concentration (MIC). The synthesized ZnO NPs were characterized by different techniques, such as Fourier transform infra-red spectroscopy (FTIR), scanning electron microscopy (SEM), energy dispersive X-ray (EDX), and transmission electron microscopy (TEM). The average size of the nanoparticles was 25 nm as analyzed by TEM. ZnO NPs at sub MIC decreased the production of virulence factors such as pyocyanin, protease and hemolysin for P. aeruginosa (p ≤ 0.05). The interaction of NPs with the P. aeruginosa cells on increasing concentration of NPs at sub MIC levels showed greater accumulation of nanoparticles inside the cells as analyzed by TEM.

scholarly journals Tapered Optical Fiber-Based LSPR Biosensor for Ascorbic Acid Detection

2020 ◽  
Author(s):  
Guo Zhu ◽  
Lokendra Singh ◽  
Yu Wang ◽  
Ragini Singh ◽  
Bingyuan Zhang ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Electron Microscope ◽  
Optical Fiber ◽  
Single Mode ◽  
Localized Surface Plasmon ◽  
Ascorbate Oxidase ◽  
Zno Nps ◽  
Absorbance Peak ◽  
The Stability ◽  
Ascorbic Acid Detection

Abstract The ascorbic acid (AA) is a biomarker that can be used to detect the symptoms of severe disorders such as scurvy, Parkinson’s, Alzheimer’s, and cardiovascular diseases. In this work, a simple and effective sensor model is developed to diagnose the presence of AA samples. To develop the sensor, a tapered single-mode optical fiber has been used with the well-known phenomenon of localized surface plasmon resonance (LSPR). For LSPR, the tapered region is immobilized with synthesized gold nanoparticles (AuNPs) and zinc oxide nanoparticles (ZnO-NPs) whose absorbance peak wavelengths appear at 519nm and 370nm, respectively. On the basis of nanoparticles (NPs) configurations, two different biosensor probes are developed. In the first one, the sensing region is immobilized with AuNPs and named Probe I. In the second probe, the immobilized layer of AuNPs is further coated with a layer of ZnO-NPs, and a resultant probe is termed as Probe II. The characterizations of synthesized AuNPs and developed fiber probes are done by the ultraviolet-visible (UV-vis) spectrophotometer, high-resolution transmission electron microscope (HR-TEM), atomic force microscopy (AFM), and scanning electron microscope (SEM). To enhance the selectivity, a sensing region of probes is functionalized with ascorbate oxidase enzyme that oxidizes the AA in the presence of oxygen. The response of developed sensor probes is authenticated by sensing the samples of AA in the range from 500 nM to 1 mM, which covers the range of AA found in human bodies, i.e., 40µM–120µM. The performance analysis of the developed sensor probes has been done in terms of their stability, reproducibility, reusability, and selectivity. To observe the stability of AA, a pH-test has also been done that results in a better solubility of AA molecules in phosphate-buffered saline (PBS) solution.

scholarly journals Biodegradable Hybrid Nanocomposite of Chitosan/Gelatin and Green Synthesized Zinc Oxide Nanoparticles for Food Packaging

Foods ◽  
2020 ◽  
Vol 9 (9) ◽  
pp. 1143 ◽  
Author(s):  
Santosh Kumar ◽  
Abhinab Mudai ◽  
Barnali Roy ◽  
Indra Bhusan Basumatary ◽  
Avik Mukherjee ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Zinc Oxide ◽  
Food Packaging ◽  
Fruits And Vegetables ◽  
Nanocomposite Films ◽  
Hybrid Nanocomposite ◽  
Hybrid Films ◽  
Zno Nps ◽  
Gram Positive Bacteria ◽  
Average Size

In the context of emerging global concerns with synthetic plastic packaging, alternative natural biodegradable packaging materials are gaining increasing attention for food packaging applications. In this study, chitosan and gelatin nanocomposite hybrid films containing green synthesized zinc oxide (ZnO) nanoparticles (NPs) were developed and microstructural properties were studied. Antimicrobial activity of the developed films was evaluated using both Gram negative (Escherichia coli) and Gram positive bacteria (Staphylococcus aureus). Green synthesis protocol was used for the precipitation of ZnO NPs using fruit extract of Cassia fistula. The as-synthesized polyhedral ZnO NPs were in the range of 20–40 nm (average size ≈29 nm). Reinforcement with ZnO NPs in the hybrid films lead to improved thermal stability, elongation-at-break (EAB), and compactness properties. The developed films with 2% and 4% ZnO NPs showed a smooth, compact, and heterogeneous surface morphology compared to the control (chitosan-gelatin hybrid) films. Disc diffusion assays showed that the nanocomposite film had significant antimicrobial activity against E. coli. The developed hybrid nanocomposite films have potential to be developed as biodegradable alternative for postharvest packaging of fresh fruits and vegetables.

Biosynthesis of ZnO nanoparticles using barberry (Berberis vulgaris) extract and assessment of their physico-chemical properties and antibacterial activities

2018 ◽  
Vol 7 (2) ◽  
pp. 114-121 ◽  
Author(s):  
Younes Anzabi
Keyword(s):  
Reaction Time ◽  
Antioxidant Activities ◽  
Chemical Properties ◽  
Antibacterial Activities ◽  
Inhibitory Effect ◽  
Zno Nps ◽  
Synthesis Conditions ◽  
Berberis Vulgaris ◽  
Average Size ◽  
20 Nm

AbstractZinc oxide nanoparticles (ZnO NPs) were synthesized using barberry (Berberis vulgaris) extract via heating method. The effects of the amount of barberry extract (15–35 ml) and the reaction time (30–90 min) on the antibacterial (clear zone diameter, mm) and antioxidant (%) activities of the synthesized ZnO NPs were investigated by response surface methodology. Main reducing and stabilizing compounds of barberry extract were identified by gas chromatography and Fourier transform infrared spectroscopy. Spherical ZnO NPs with an average size of 20 nm were successfully fabricated at optimal synthesis conditions using 35 ml of barberry extract and 30 min reaction time. ZnO NPs were determined to have a zeta potential of –15.3 mV and an antioxidant activity of 28.8%. The antibacterial activity of fabricated ZnO NPs was tested againstStaphylococcus aureusand found to possess significant (p<0.05) inhibitory effect against this microorganism.

scholarly journals Biological Activities of Purified HarpinXoo and HarpinXoo Detection in Transgenic Plants Using Its Polyclonal Antibody

2005 ◽  
Vol 37 (10) ◽  
pp. 713-718 ◽  
Author(s):  
Ming Li ◽  
Min Shao ◽  
Xu-Zhong Lu ◽  
Jin-Sheng Wang
Keyword(s):  
Heat Treatment ◽  
Virus Resistance ◽  
Erwinia Amylovora ◽  
Biological Activities ◽  
Xanthomonas Oryzae ◽  
Metabolic Inhibitors ◽  
Glutathione S Transferase ◽  
E Coli ◽  
Thrombin Cleavage ◽  
Promote Plant Growth

AbstractMany harpins have been found in plant pathogen bacteria that can elicit disease and insect resistance in plants, and promote plant growth. In this work, we overexpressed and purified Xanthomonas oryzae pv. oryzae harpin, harpinXoo, in Escherichia coli BL21/pGEX-hpa1. HarpinXoo was fused to the Cterminus of glutathione S-transferase (GST) and purified using the Bulk GST purification module and thrombin cleavage capture kit. Purified harpinXoo protein was sensitive to protease K and stable to heat treatment, and could not induce a hypersensitive response after treatment with various plant metabolic inhibitors; these characteristics were similar to harpinEa of Erwinia amylovora. The purified harpinXoo showed a similar ability to induce tobacco mosaic virus resistance in tobacco as harpinEa. Its antibody worked well in detecting the purified harpinXoo, harpinXoo in the total protein of E. coli BL21/pGEX-hpa1 and an hpa1 ransgenic rice.

scholarly journals Characterization and biological activities of synthesized zinc oxide nanoparticles using the extract of Acantholimon serotinum

2020 ◽  
Vol 9 (1) ◽  
pp. 722-733
Author(s):  
Mohammad Reza Karimzadeh ◽  
Sara Soltanian ◽  
Mahboubeh Sheikhbahaei ◽  
Neda Mohamadi
Keyword(s):  
Cell Lines ◽  
Biological Activities ◽  
Fold Increase ◽  
Diffusion Method ◽  
Ros Generation ◽  
Zno Nps ◽  
Human Colon Cancer ◽  
Hek 293 ◽  
Vis Spectroscopy ◽  
Apoptosis Gene

AbstractThe present study reports the synthesis of ZnO-NPs using Acantholimon serotinum extracts followed by characterization and evaluation of biological activities. Field emission scanning electron microscope revealed irregular spherical morphology with a size in the range of 20–80 nm. The X-ray diffraction analysis confirmed the synthesis of highly pure ZnO NPs with a hexagonal shape and a crystalline size of 16.3 nm. The UV-Vis spectroscopy indicates the synthesis of ZnO-NPs. FT-IR confirmed the presence of phytocomponents in the plant extract, which was responsible for nanoparticle synthesis. According to MTT results, the biosynthesized ZnO-NPs showed cytotoxic effects on human colon cancer Caco-2 (IC50: 61 µg/mL), neuroblastoma SH-SY5Y (IC50: 42 µg/mL), breast cancer MDA-MB-231 (IC50: 24 µg/mL), and embryonic kidney HEK-293 (IC50: 60 µg/mL) cell lines. Significant reactive oxygen species (ROS) generation was measured by the DCFH-DA assay after 24 h incubation with ZnO-NPs (200 µg/mL). ZnO-NPs caused apoptotic and necrotic effects on cells, which was confirmed by Annexin V-PE/7-AAD staining and 6.8-fold increase in pro-apoptosis gene Bax and 178-fold decrease in anti-apoptosis gene Bcl-2. The well diffusion method did not show effective growth inhibition activities of the ZnO-NPs against bacteria. In conclusion, the ZnO-NPs induce cytotoxicity in cell lines through ROS generation and oxidative stress.

scholarly journals Assessment the Modulation effect of using Green synthesis ZnO NPs against Multidrug Resistant Klebsiella pneumoniae isolated from respiratory tract infection

2019 ◽  
pp. 1221-1231
Author(s):  
Amjed A. Majeed ◽  
Mouruj A. Al-Aubydi
Keyword(s):  
Klebsiella Pneumoniae ◽  
Respiratory Tract ◽  
Green Tea ◽  
Multidrug Resistant ◽  
Synthesis Process ◽  
Modulation Effect ◽  
Zno Nps ◽  
Isolation And Characterization ◽  
Average Size ◽  
Tract Infections

Klebsiella pneumoniae is one of common hospital-acquired bacteria causing nosocomial pneumonia, urinary tract infections, and intra-abdominal infections. The aim of this study is investigating the Modulation effect of Zinc Oxide nanoparticles (ZnO NPs) against multidrug resistant K. pneumonia which was isolated from Respiratory Tract Infections (RTIs). The results of isolation and characterization of bacterial specimens showed that 20.81% of RTIs were Klebsiella pneumoniae. The strongest isolate showed resistant for most usable antibiotics selected. Simultaneously, ZnO NPs were produced by an aqueous extract of Green Tea leaves as a reducing and stabilizer agent. The Ultraviolet-Visible (UV-Vis) spectrum was indicated a successful production of ZnO NPs at 383 nm. X-Ray Diffractometry (XRD) pattern showed peaks at 2θ positions matching to standards and indicating a formation of hexagonal (wurtzite) shape of ZnO NPs, with an average size of 22nm. Fourier Transform- Infrared (FT-IR) spectra of ZnO NPs revealed the participating of Green Tea biomolecules in the synthesis process. The minimum inhibitory concentration (MIC) of ZnO NPs against K. pneumoniae was 3.2 mg/mL. The results of using nanoparticles showed a morphological changing in K. pneumoniae colonies, and a modulation effect occurred against some antibiotic resistance of Klebsiella pneumoniae such as Gentamycin and Levofloxacin.

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