scholarly journals Antioxidant activity and green synthesis of selenium nanoparticles using allium sativum extract

2017 ◽  
Vol 9 (4) ◽  
pp. 634 ◽  
Author(s):  
Jay Vyas ◽  
Shafkat Rana
Keyword(s):  
Green Synthesis ◽  
Cost Effective ◽  
Selenium Nanoparticles ◽  
Spherical Particles ◽  
Frap Assay ◽  
Environment Friendly ◽  
Synthesis Of Nanoparticles ◽  
Transmission Electron ◽  
Ft Ir ◽  
Uv Visible

<p><strong>Abstract</strong></p><p>The green synthesis of nanoparticles has provided cost effective, environment friendly procedure and raising safe strategies for synthesis of non-materials. In this study we investigated the clove of <em>Allium sataivum</em>, which is used for the synthesis of Selenium nanoparticles. The biosynthesized selenium nanoparticles were characterized by using UV-Visible (UV-VIS) spectrophotometer, Transmission electron microscopy (TEM), Fourier transform spectroscopy (FT-IR) and Energy dispersive X-Ray spectroscopy (EDAX). The selenium nanoparticles synthesized by garlic were observed as hollow and spherical particles in size ranging 7-45nm which is found more stable more than two months. The present study also reports the efficiency of ABTS, DPPH and FRAP assay to estimate the antioxidant potential of selenium nanoparticles which synthesized by garlic extract.</p><p> </p>

scholarly journals ANTIOXIDANT ACTIVITY AND BIOGENIC SYNTHESIS OF SELENIUM NANOPARTICLES USING THE LEAF EXTRACT OF ALOE VERA

2017 ◽  
Vol 9 (4) ◽  
pp. 147 ◽  
Author(s):  
Jay Vyas ◽  
Shafkat Rana
Keyword(s):  
Antioxidant Activity ◽  
Aloe Vera ◽  
Selenium Nanoparticles ◽  
Spherical Particles ◽  
Elemental Selenium ◽  
Biogenic Synthesis ◽  
Transmission Electron ◽  
Ft Ir ◽  
Ir Analysis ◽  
Chemoprevention Agent

Objective: The objective of this present study were to the biogenic synthesis of selenium nanoparticles using Aloe vera extract and check it’s antioxidant potential by ABTS, DPPH and FRAP assays.Methods: In this study we investigated the clove of Aloe vera, which is used for the synthesis of selenium nanoparticles were characterized by using UV-Visible (UV-VIS) spectrophotometer, Transmission electron microscopy (TEM), Fourier transform spectroscopy (FTIR) and Energy dispersive X-Ray spectroscopy (EDAX) and ABTS, DPPH and FRAP assays for checked it’s antioxidant potential.Results: The present study was carried out to synthesis of Selenium nanoparticles using extract of Aloe vera. UV-Vis Spectra at 350 nm with Aloe vera extract and observed as hollow and spherical particles in size ranging 7-48 nm which is found more stable more than two months. EDAX analysis was carried out to check the presoak of Selenium in nanoparticles. Results of EDAX, confirmed its present. TEM and SEAD represented addition evidence of formation of nanoparticles whereas SEAD indicates the particles were crystalline in nature. FT-IR analysis was carried out to identify the possible bio molecules and Aloe vera extract-metal ions interaction responsible for formation and stabilization of selenium nanoparticles. FRAP, ABTS and DPPH assay results sequester that Selenium nanoparticles prepared using Aloe vera extract possess more activity than extract alone.Conclusion: The bio molecules of Aloe veraextract acted as stabilizing as well as capping agent leading to the formation of Selenium nanoparticles. Selenite has been proven to have antioxidant activity and is being used as chemoprevention agent in cancer diagnosis but same time it is toxic also. Elemental Selenium i.e. Selenium nanoparticles are less toxic form of selenium. 

scholarly journals Green synthesis of copper nanoparticles using extract of Dicliptera Roxburghiana, their characterization and photocatalytic activity against methylene blue degradation

2020 ◽  
Vol 9 (1) ◽  
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Green Synthesis ◽  
Copper Nanoparticles ◽  
Plant Extract ◽  
Fixed Ratio ◽  
Colour Change ◽  
Synthesis Of Nanoparticles ◽  
Ft Ir ◽  
Uv Visible

In the modern scientific era, nanotechnology isone of the burning field for researchers and scientists because of their applications in a number of areas. The synthesis of nanoparticles (particles having size 1-100 nm) is also the centre of attraction towards researchers due to its unique chemical and physical properties and wide applications. Nanoparticles can be synthesized by physical, chemical and biological processes also known as green synthesis. Among all of the methods of nanoparticles synthesis, green synthesis is non-toxic, economic and eco-friendly and also applicable to in numerous fields such as medicinal chemistry, catalysis etc. In the present study, we investigate the potential of the extract of plant dicliptera roxburghiana towards the synthesis of copper nanoparticles, for which a fixed ratio of plant extract and CuSO4 solution was used. The synthesis of Cu-NPs was initially confirmed by colour change of CuSO4 from blue to brownish green. The synthesized copper nanoparticles were studied and characterized by XRD, FT-IR and UV-Visible spectroscopy and later on subjected towards the photocatalytic degradation of organic dye methylene blue. Surface Plasmon Resonance of Cu-NPs was found to be at 578 nm using UV-Visible analysis and characteristic peak at 517-519 nm of copper nanoparticles were given by FT-IR spectrometer while XRD analysis showed the spherical shape of Cu-NPs having size of 58 nm. The photocatalytic activity of Cu-NPs was also studied in a comparison manner between the Cu-NPs in dried form and Cu-NPs in plant extract solution against methylene blue under sunlight.

scholarly journals Synthesis of Al-Based Metal-Organic Framework in Water With Caffeic Acid Ligand and NaOH as Linker Sources With Highly Efficient Anticancer Treatment

2021 ◽  
Vol 9 ◽  
Author(s):  
Malihe Zeraati ◽  
Abbas Rahdar ◽  
Dora I. Medina ◽  
Ghasem Sargazi
Keyword(s):  
Electron Microscopy ◽  
Green Synthesis ◽  
Metal Organic Framework ◽  
Cost Effective ◽  
Spherical Particles ◽  
Anticancer Properties ◽  
Synthesis Route ◽  
Anticancer Treatment ◽  
Metal Organic ◽  
Organic Framework

In this study, novel nanostructures of aluminum base metal-organic framework (Al-MOF) samples were synthesized using a sustainable, non-toxic, and cost-effective green synthesis route. Satureja hortensis extract was used as an effective source of linker for the development of the Al-MOF structures. The Fourier-transformed infrared (FTIR) spectrum confirmed the presence of characterization bonds related to the Al-MOF nanostructures synthesized by the green synthesis route. The scanning electron microscopy (SEM) and transmission electron microscopy (TEM) analyses revealed that the sample synthesized by Na2-CA was composed of multilayers, although it was agglomerated, but it had dispersed and occurred in spherical particles, indicating active organic matter. N2 adsorption/desorption isotherms demonstrated the significant porosity of the Al-MOF samples that facilitate the high potential of these nanostructures in medical applications. The anticancer treatment of Al-MOF samples was performed with different concentrations using the MTT standard method with untreated cancer cells for 24 and 48 h periods. The results exhibited the significant anticancer properties of Al-MOF samples developed in this study when compared with other MOF samples. Thus, the development of a novel Al-MOF and its application as a natural linker can influence the anticancer treatment of the samples. According to the results, the products developed in this study can be used in more applications such as biosensors, catalysts, and novel adsorbents.

Eco-Friendly Green Synthesis of MgO Nanoparticles from Zingiber Officinale(Ginger) Root Extract and its Antibacterial Application

2021 ◽  
Vol 9 (VI) ◽  
pp. 4219-4222
Author(s):  
R. D. More
Keyword(s):  
Green Synthesis ◽  
Pathogenic Bacteria ◽  
Visible Region ◽  
Cost Effective ◽  
Zingiber Officinale ◽  
Band Gap Energy ◽  
Root Extract ◽  
Mgo Nanoparticles ◽  
Medicinal Value ◽  
Uv Visible

In this study preparation of MgO nanoparticles using Zingiber officinale (ginger) aqueous root extract by using green method. The green synthesis approaches are recognized by many scientists due to its cost effective, simple, eco-friendly. The stability and reduction of Mg+2 ions to MgO nanoparticles were characterized by UV-Visible spectroscopic analysis. From UV-Visible spectroscopy, higher band gap energy of 7.8 eV is obtained in the near visible region at the wavelength of 300 nm. The Zingiber officinale (ginger) root extract act as reducing agent for stabilization of particle size as well as medicinal value result showed a significant antibacterial activity against pathogenic bacteria, E.Coli.and S.aureus. The present investigation deals with the green synthesis of MgO nanoparticles and its antibacterial effect on selected bacteria.

Preparation of Gold Nanowires by Photochemical Glucose Reduction

2019 ◽  
Vol 807 ◽  
pp. 11-17
Author(s):  
Zi Jing Li ◽  
Yan Jiang ◽  
Shao Ping Feng ◽  
Li Da Sun ◽  
Bo Zhou
Keyword(s):  
Average Diameter ◽  
Nucleation And Growth ◽  
Spherical Particles ◽  
Gold Nanowires ◽  
Photochemical Reduction ◽  
Transmission Electron ◽  
Dimensional Network ◽  
Uv Visible ◽  
Photo Sensitizer ◽  
Glucose Reduction

HAuCl4 was reduced by glucose as reducing agent and dispersant under UV radiation and acetone as photo sensitizer. The experimental samples were characterized by the transmission electron microscopy and UV-visible spectrophotometer, and the results show that these gold nanoparticles’ size is uniform, monodisperse distribution of spherical particles of average diameter of 5.8 nm, and gold nanowires with two-dimensional network structure were successfully prepared. The influence of glucose concentration on reaction under this condition and the mechanism of nucleation and growth of the photochemical reduction were discussed.

scholarly journals Recent Advances in the Synthesis and Stabilization of Nickel and Nickel Oxide Nanoparticles: A Green Adeptness

2016 ◽  
Vol 2016 ◽  
pp. 1-14 ◽  
Author(s):  
Muhammad Imran Din ◽  
Aneela Rani
Keyword(s):  
Nickel Oxide ◽  
Green Synthesis ◽  
Biological Effects ◽  
Cost Effective ◽  
Synthetic Methods ◽  
Biological Behavior ◽  
Oxide Nanoparticles ◽  
Nickel Oxide Nanoparticles ◽  
Synthesis Of Nanoparticles ◽  
Synthesis Properties

Green protocols for the synthesis of nanoparticles have been attracting a lot of attention because they are eco-friendly, rapid, and cost-effective. Nickel and nickel oxide nanoparticles have been synthesized by green routes and characterized for impact of green chemistry on the properties and biological effects of nanoparticles in the last five years. Green synthesis, properties, and applications of nickel and nickel oxide nanoparticles have been reported in the literature. This review summarizes the synthesis of nickel and nickel oxide nanoparticles using different biological systems. This review also provides comparative overview of influence of chemical synthesis and green synthesis on structural properties of nickel and nickel oxide nanoparticles and their biological behavior. It concludes that green methods for synthesis of nickel and nickel oxide nanoparticles are better than chemical synthetic methods.

scholarly journals Green synthesis of Ag, Zn and Cu nanoparticles from aqueous extract of Spondias mombin leaves and evaluation of their antibacterial activity

2020 ◽  
Vol 21 (2) ◽  
pp. 106-113
Author(s):  
D.K. Adeyemi ◽  
A.O. Adeluola ◽  
M.J. Akinbile ◽  
O.O. Johnson ◽  
G.A. Ayoola
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Green Synthesis ◽  
Antimicrobial Activities ◽  
Cu Nanoparticles ◽  
E Coli ◽  
Spondias Mombin ◽  
Ft Ir ◽  
Uv Visible

Background: Nanotechnology offers an advantage as a green route for synthesis of metal nanoparticles (NPs) with plant extracts as capping agent. Spondias mombin is a fruit-bearing tree and its leaf extracts have been reported to possess anxiolytic, hypoglycaemic, antiepileptic, antipsychotic, sedative, antioxidant, and antimicrobial properties. The objective of the study is to determine the antibacterial potential of a simple non-toxic product of green synthesis of metallic (Ag, Zn and Cu) nanoparticles using the leaf of Spondias mombin aqueous extracts (SMAE) as a reducing and capping agents of the metal ions.Methodology: Nanoparticles were characterized by UV visible spectrophotometeric analysis, Fourier Transform Infra-Red (FT-IR) spectrophotometer and scanning electron microscope (SEM). Antimicrobial activities of synthesized NPs against Escherichia coli, Staphylococcus aureus and Pseudomonas aeruginosa were determined by agar well diffusion technique.Results: The synthesized NPs varied in colour from dark brown to green and appears dominantly spherical, occasionally rod or triangular shaped with size ranging from 65-90 nm. UV spectroscopy absorption spectra of Ag, Zn and Cu NPs had absorbance peak at 267, 262 and 765 nm respectively. FT-IR spectrometry of Zn NP, Cu NP, and SMAE gave wave number ranging from 895.71-3320.67, 747.02-3225.45 and 658.25-3674.49 respectively. FT-IR analysis showed that SMAE acted as reducing and stabilizing agent while the NPs exhibited lower energy absorption band when compared to the plant extract. The NPs demonstrated higher antimicrobial activities against S. aureus than Ps. aeruginosa and E. coli. The antimicrobial activity was higher with copper NP than Ag and Zn NPs, and also higher than SMAE.Conclusion: The result from this study presents an indication for an alternative means for development of novel antimicrobial agents for clinical and biotechnological applications.Keywords: synthesis, nanoparticles, FT-IR, UV-visible spectrophotometry, antibacterial activitiesFrench Title: Synthèse verte de nanoparticules d'Ag, de Zn et de Cu à partir d'extrait aqueux de feuilles de Spondias mombin et évaluation de leur activité antibactérienneContexte: La nanotechnologie offre un avantage en tant que voie verte pour la synthèse de nanoparticules métalliques (NP) avec des extraits de plantes comme agent de coiffage. Spondias mombin est un arbre fruitier et ses extraits de feuilles possèdent des propriétés anxiolytiques,  hypoglycémiques, antiépileptiques, antipsychotiques, sédatives,  antioxydantes et antimicrobiennes. L’objectif de l’étude est de déterminer le potentiel antibactérien d’un simple produit non toxique de synthèse verte de nanoparticules métalliques (Ag, Zn et Cu) à l’aide de la feuille d’extraits aqueux de Spondias mombin (SMAE) en tant qu’agent réducteur et coiffant de la ions métalliques.Méthodologie: Les nanoparticules ont été caractérisées par analyse  spectrophotométrique UV visible, spectrophotomètre à transformée de Fourier infrarouge (FT-IR) et microscope électronique à balayage (MEB). Lesactivités antimicrobiennes de NP synthétisées contre Escherichia coli, Staphylococcus aureus et Pseudomonas aeruginosa ont été déterminées par une technique de diffusion sur puits d’agar.Résultats: Les NP synthétisés ont une couleur allant du brun foncé au vert et apparaissent principalement sphériques, parfois en bâtonnets ou en triangles, avec des tailles allant de 65 à 90 nm. Les spectres  d'absorption par spectroscopie UV des NP Ag, Zn et Cu présentaient des pics  d'absorbance à 267, 262 et 765 nm respectivement. La spectrométrie FT-IR de Zn NP, Cu NP et SMAE a donné un nombre d'onde allant de 895,71 à 3320,67, 747,02 à 3225,45 et 658,25 à 3674,49 respectivement. L'analyse FT-IR a montré que le SMAE agissait en tant qu'agent réducteur et  stabilisant, alors que les NP présentaient une bande d'absorption d'énergie inférieure à celle de l'extrait de plante. Les NP ont démontré des activités antimicrobiennes plus élevées contre S. aureus que Ps. aeruginosa et E. coli. L'activité antimicrobienne était plus élevée avec les NP en cuivre que dans les NP Ag et Zn, et également supérieure à celle du SMAE.Conclusion: le résultat de cette étude présente une indication d'un autre moyen de développement de nouveaux agents antimicrobiens pour des applications cliniques et biotechnologiques.Mots-clés: synthèse, nanoparticules, FT-IR, spectrophotométrie UV-visible, activités antibactériennes 

scholarly journals Microwave Assisted Rapid and Green Synthesis of Silver Nanoparticles Using a Pigment Produced byStreptomyces coelicolorklmp33

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Deene Manikprabhu ◽  
K. Lingappa
Keyword(s):  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Streptomyces Coelicolor ◽  
Biological Synthesis ◽  
Toxic Substances ◽  
X Ray Diffraction ◽  
Chemical Methods ◽  
Major Drawback ◽  
Transmission Electron ◽  
Uv Visible

Traditional synthesis of silver nanoparticles using chemical methods produces toxic substances. In contrast biological synthesis is regarded as a safe and nontoxic process but the major drawback of biological synthesis is, this process is slow. In the present investigation, we developed a rapid and green synthesis of silver nanoparticles employing a pigment produced byStreptomyces coelicolorklmp33 in just 90 s. The silver nanoparticles were characterized by UV-visible spectroscopy, transmission electron microscopy (TEM), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). The biobased synthesis developed in this method is a safe, rapid, and appropriate way for bulky synthesis of silver nanoparticles.

Formation of V2O5-based mixed oxides in flames

1993 ◽  
Vol 8 (9) ◽  
pp. 2404-2413 ◽  
Author(s):  
Philippe F. Miquel ◽  
Cheng-Hung Hung ◽  
Joseph L. Katz
Keyword(s):  
Vanadium Oxide ◽  
Mixed Oxides ◽  
Supported Catalysts ◽  
Spherical Particles ◽  
Oxide Powders ◽  
Transmission Electron ◽  
Bet Analysis ◽  
Nitrogen Desorption ◽  
Intimate Mixture ◽  
Ft Ir

V2O5–TiO2 and V2O5–Al2O3 mixed oxide powders were synthesized in a hydrogen-oxygen flame using VOCl3, TiCl4, and Al(CH3)3 as precursors. The particle formation processes were investigated as a function of VOCl3 concentration by laser light-scattering and by collecting particles directly onto transmission electron microscopy grids. In the V2O5–TiO2 system, the oxides condense as an intimate mixture at all three VOCl3 concentrations. Spherical particles, 40 to 70 nm in diameter, are obtained. In the V2O5–Al2O3 system, chain-like particles composed of an intimate mixture of V2O5 and Al2O3 form at the lowest VOCl3 concentration. At high VOCl3 concentrations, the chain-like particles have a core-mantle structure (a core mainly of Al2O3 and a mantle mainly of V2O5). The crystalline form and the surface area of these mixed oxides were determined by x-ray diffractometry, FT-IR spectroscopy, and BET analysis by nitrogen desorption. These measurements indicate that amorphous vanadium oxide forms at low VOCl3 concentrations, and V2O5 is obtained at the higher VOCl3 concentrations. The structure of the amorphous vanadium oxide matches that published for vanadium oxide “supported” catalysts.

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