scholarly journals Biosynthesis of Gold Nanoparticles Using Fusarium oxysporum f. sp. cubense JT1, a Plant Pathogenic Fungus

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Janki N. Thakker ◽  
Pranay Dalwadi ◽  
Pinakin C. Dhandhukia
Keyword(s):  
Antimicrobial Activity ◽  
Gold Nanoparticles ◽  
Chloride Solution ◽  
Pathogenic Fungus ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Plant Pathogenic Fungus ◽  
Extracellular Synthesis ◽  
Vis Spectroscopy ◽  
Methods Of Synthesis

The development of reliable processes for the synthesis of gold nanoparticles is an important aspect of current nanotechnology research. Recently, reports are published on the extracellular as well as intracellular biosynthesis of gold nanoparticles using microorganisms. However, these methods of synthesis are rather slow. In present study, rapid and extracellular synthesis of gold nanoparticles using a plant pathogenic fungus F. oxysporum f. sp. cubense JT1 (FocJT1) is reported. Incubation of FocJT1 mycelium with auric chloride solution produces gold nanoparticles in 60 min. Gold nanoparticles were characterized by UV-Vis spectroscopy, FTIR, and particle size analysis. The particles synthesized were of 22 nm sized, capped by proteins, and posed antimicrobial activity against Pseudomonas sp.

scholarly journals Synthesis and Self-assembly of DMPC-conjugated Gold Nanoparticles

2007 ◽  
Vol 1061 ◽  
Author(s):  
Subhasish Chatterjee ◽  
Markrete Krikorian ◽  
Harry D. Gafney ◽  
Bonnie Gersten
Keyword(s):  
Gold Nanoparticles ◽  
Self Assembly ◽  
Phase Transfer ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Compression Isotherm ◽  
Self Assembled Monolayer ◽  
Transmission Electron ◽  
Vis Spectroscopy ◽  
Transfer Method

ABSTRACTBio-conjugated nanomaterials play a promising role in the development of novelsupramolecular structures, molecular machines, and biosensing devices. In this study, lipid-capped gold nanoparticles were synthesized and allowed to form a self-assembled monolayer structure. The nanoparticles were prepared by a phase transfer method, which involved the reduction of potassium tetrachloroaurate(III) by sodium citrate in an aqueous solution and the simultaneous transfer of the reduced species to an organic medium containing DMPC (1,2-dimyristoyl-sn-glycero-3-phosphocholine). The gold nanoparticles were characterized using Uv-vis spectroscopy and dynamic light scattering (DLS) particle-size analysis. In addition, the resulting nanoparticles were examined using transmission electron microscopy (TEM). The Langmuir-Blodgett (LB) technique was used to assemble the DMPC-capped nanoparticles onto a water subphase at room temperature. The measurement of the compression isotherm confirmed the assemblage of lipid capped gold nanoparticles. This method of synthesis of ordered structures utilizing molecular interactions of lipids will be useful in developing novel metamaterials and nanocircuits.

scholarly journals Multifunctional hyperbranched polyester grafted β-cyclodextrin metal complexes for textile coating

2020 ◽  
Vol 10 (4) ◽  
pp. 6000-6006
Keyword(s):  
Antimicrobial Activity ◽  
Particle Size ◽  
Metal Binding ◽  
Particle Size Analysis ◽  
Diffusion Method ◽  
Size Analysis ◽  
Distribution Analysis ◽  
Organic Pigment ◽  
Escherichia Coli Bacteria ◽  
Cellulosic Fabric

This study approached the developing of grafted beta cyclodextrins (β-CD) for achievement multifunctional properties. Hyperbranched bis-MPA-polyester-16-hydroxyl, generation 2, (HBPE-2) was used as crosslinker in the presence of cobalt (Co) or nickel (Ni) acetate using emulsion technique. The resulting materials were applied in the printing paste for in situ printing of cellulosic fabrics using phthalocyanine organic pigment (C.I: pigment blue 15:3). Fourier transform infrared spectroscopy (FTIR), transmission electron microscope (TEM) and particle size distribution analysis using dynamic light scattering (DLS) technique were examined to illustrate the structure and morphologies of the prepared materials. Moreover, the antimicrobial activity against gram-positive (Staphylococcus aureus) and gram-negative (Escherichia coli) bacteria using the agar diffusion method was also carried out. The FTIR results demonstrated that HBPE-2 can serve as a good crosslinker to obtain the grafted β-CD with high thermal stability and physical attachment relative to the uncrosslinked one. Also, TEM and particle size analysis indicated that successful metal binding to the grafted β-CD was obtained with different morphologies and low particle size relative the uncrosslinked one. All the grafted β-CD samples exhibited good antimicrobial activity up to 20 mg concentration. Besides, the prepared materials accelerated the colour fixation on the surface of the cellulosic fabric prints relative to the used conventional pigment printing under the unfavorable conditions.

scholarly journals Novelty of Bioengineered Iron Nanoparticles in Nanocoated Surgical Cotton: A Green Chemistry

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Bhavika Turakhia ◽  
Saujanya Chikkala ◽  
Sejal Shah
Keyword(s):  
Antimicrobial Activity ◽  
Particle Size ◽  
Green Chemistry ◽  
Iron Nanoparticles ◽  
Synthesis Method ◽  
Cost Effective ◽  
Zingiber Officinale ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Ginger Extract

The current focus of nanotechnology is to develop environmentally safe methodologies for the formulation of nanoparticles. The phytochemistry of Zingiber officinale inspired us to utilize it for the synthesis of iron nanoparticles. GC-MS analysis revealed the phytochemical profile of ginger. Out of 20 different chemicals, gingerol was found to be the most potent phytochemical with a retention time of 40.48 min. The present study reports a rapid synthesis method for the formation of iron nanoparticles and its potential efficacy as an antibacterial agent and an antioxidant. Because of its antibacterial property, ginger extract was used to coat surgical cotton. Synthesized ginger root iron nanoparticles (GR-FeNPs) were characterized by UV-visible spectroscopy, Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction analysis, and particle size analysis. XRD confirmed the crystalline structure of iron oxide nanoparticles as it showed the crystal plane (2 2 0), (3 1 1), (2 2 2), and (4 0 0). The particle size analyzer (PSA) showed the average size of the particles, 56.2 nm. The antimicrobial activity of the FeNPs was tested against different Gram-positive and Gram-negative bacteria. E. coli showed maximum inhibition as compared with the other organisms. Antioxidant activity proved the maximum rate of free radicals at 160 µg/mL produced by nanoparticles. In addition, the antimicrobial activity of nanocoated surgical cotton was evaluated on the first day and 30th day after coating, which clearly showed excellent growth inhibition of organisms, setting a new path in the field of medical microbiology. Hence, iron-nanocoated surgical cotton synthesized using green chemistry, which is antimicrobial and cost effective, might be economically helpful and provide insights to the medical field, replacing conventional wound healing treatments, for better prognosis.

Microbial Transformation of (−)-Carvone¥

2004 ◽  
Vol 59 (5-6) ◽  
pp. 389-392 ◽  
Author(s):  
Fatih Demirci ◽  
Yoshiaki Noma ◽  
Neş’e Kırımer ◽  
K. Hüsnü Can Başera
Keyword(s):  
Antimicrobial Activity ◽  
Absolute Configuration ◽  
Pathogenic Fungus ◽  
Microbial Transformation ◽  
Crystalline Substance ◽  
Spectroscopic Techniques ◽  
Pathogenic Microorganisms ◽  
X Ray Diffraction ◽  
X Ray ◽  
Plant Pathogenic Fungus

The cyclic monoterpene ketone (−)-carvone was metabolized by the plant pathogenic fungus Absidia glauca. After 4 days of incubation, the diol 10-hydroxy-(+)-neodihydrocarveol was formed. The absolute configuration and structure of the crystalline substance was identified by means of X-ray diffraction and by spectroscopic techniques (MS, IR and NMR). The antimicrobial activity of the substrate and metabolite was assayed with human pathogenic microorganisms.

Development of Smart Nanocontainers With A Zinc Phosphate Core and A pH-Responsive Shell for Controlled Release of Immidazole

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
Ananda Jaysing Jadhav ◽  
Sammit Ekanath Karekar ◽  
Dipak Vitthal Pinjari ◽  
Yogesh Gajanan Datar ◽  
Bharat Apparao Bhanvase ◽  
...  
Keyword(s):  
Particle Size ◽  
Polyacrylic Acid ◽  
Zinc Phosphate ◽  
Average Particle Size ◽  
Particle Size Analysis ◽  
Core Material ◽  
Size Analysis ◽  
Average Particle ◽  
Layer By Layer ◽  
Vis Spectroscopy

AbstractA simple and flexible method has been developed to fabricate reversibly switchable nanocontainers (by layer by layer assembly) using zinc phosphate (ZP) nanoparticles as a core material and subsequent deposition of oppositely charged species of polyelectrolyte (polyaniline and polyacrylic acid) and organic corrosion inhibitor (immidazole). Immidazole was entrapped between polyaniline (PANI) and polyacrylic acid (PAA). The PAA nanovalve can control the access of immidazole molecules to and from the nanocontainers. The average particle size of the synthesized nanocontainer was found to be in the range of 250–500 nm. X-ray diffraction (XRD), particle size analysis (PSA), zeta potential, and fourier transform infrared spectroscopy (FTIR) analysis confirms the successful formation of the layered structure of nanocontainers. UV-vis spectroscopy was used to analyze the release rate of immidazole in media of different pH as a function of time. This core-shell nanostructure can have potential applications in corrosion inhibition paint formulation.

Syngonium podophyllum leaf extract mediated synthesis and characterization of gold nanoparticles for biosensing potential: A sustainable approach

2020 ◽  
Vol 16 ◽  
Author(s):  
Saumya Srivastava ◽  
Anjana Pandey
Keyword(s):  
Gold Nanoparticles ◽  
Indium Tin Oxide ◽  
Leaf Extract ◽  
Modified Electrodes ◽  
Particle Size Analysis ◽  
Current Gain ◽  
Size Analysis ◽  
Electrochemical Characteristics ◽  
Ito Electrode ◽  
Average Size

Background: The existing methods of analyte detection by various biochemical processes possess certain drawbacks including nonlinearity, detection limits. The nanotechnology has paved a way for development of new devices i.e., nanobiosensors, by amalgamation of nanoparticles with recognition elements. These nano-biosensors have the capabilities to overcome the drawbacks possessed by conventional methods. Objectives: Present study was planned to analyze the biosensing potential of indium tin oxide (ITO) electrode modified with gold nanoparticles synthesized using aqueous extract of S. podophyllum. Methods: In present study, first time rapid green synthesis of gold nanoparticles from leaf extract of Syngonium podophyllum is reported. The synthesized nanoparticles were then characterized physically by UV-Visible spectroscopy, particle size analysis, fluorescent spectroscopy, Fourier transform infrared spectroscopy and transmission electron microscopy (TEM) and HR (High resolution)-TEM. Results: The particles were observed to be in average size range of 30-70 nm. Further the ITO electrode was modified with the prepared nanoparticles and analyzed by ellipsometry. The electrochemical characteristics of the modified electrodes were analyzed by cyclic voltammetry. Conclusion: The results exhibited a higher current gain, thus signifying the higher signal amplification at the electrodes and paves the way for their use in electrochemical nanobiosensors.

Simple Way for Ag-NPs Preparation based on Starch Macromolecule

2021 ◽  
Vol 18 ◽  
Author(s):  
H.M. Fahmy ◽  
A.A. Ali ◽  
A. Abou-Okeil
Keyword(s):  
Particle Size ◽  
Antibacterial Properties ◽  
Particle Size Analysis ◽  
Molar Ratio ◽  
Size Analysis ◽  
Ag Nps ◽  
Stabilizing Agent ◽  
Oxidized Starch ◽  
Vis Spectroscopy ◽  
The Mean

: Finding a sustainable, inexpensive way for Ag-NPs synthesis is considered as one of the most important requirements for industrial application. Oxidized starch was prepared using sodium periodate. Oxidized starch (DAS) was characterized by measuring aldehyde content and using FTIR spectroscopy. DAS was used as reducing and stabilizing agent for the preparation of Ag nanoparticles (Ag-NPs). Factors that may affect the preparation of Ag-NPs include pH, AgNO3/DAS molar ratio, temperature and time were studied. UV-Vis. spectroscopy and particle size analysis showed that DAS can act as reducing and stabilizing agent for the preparation of Ag-NPs and the mean particle size was 19 nm. The so prepared AgNPs were used as antibacterial agent for cotton fabric using the pad dry cure method. The results of antibacterial test showed that the presence of Ag-NPs enhanced the antibacterial properties of the treated cotton fabrics.

Novel Synthesis of Ultra-Small Silver Nanoparticles with High Antimicrobial Activity

2008 ◽  
Vol 47-50 ◽  
pp. 1080-1083 ◽  
Author(s):  
H.J. Lee ◽  
M.A. Do ◽  
E.J. Kim ◽  
J.H. Yeum ◽  
H.D. Ghim ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Particle Size Analysis ◽  
Wound Dressings ◽  
Size Analysis ◽  
High Antimicrobial Activity ◽  
Novel Synthesis ◽  
Transmission Electron

Ultra-small and well dispersed silver nanoparticles were prepared by mixing AgNO3 in PEI (polyethylenimine) solution. Particle size analysis and transmission electron microscopy confirmed that the average diameters of PEI/silver nanoparticles are 20-40 nm. The ultra-small silver nanoparticles had an antimicrobial activity in the aqueous solution at the concentration over 0.0105% by M.I.C test. Suggestively, the PEI/silver nanoparticles have potentials for development of wound dressings.

scholarly journals Synthesis and characterization of ZnO nanoparticles using aqueous extract of Becium grandiflorum for antimicrobial activity and adsorption of methylene blue

2021 ◽  
Vol 11 (2) ◽  
Author(s):  
Mebrahtu Hagos Kahsay
Keyword(s):  
Antimicrobial Activity ◽  
Plant Extract ◽  
Klebsiella Pneumonia ◽  
Zno Nps ◽  
Synthesis Of Nanoparticles ◽  
Synthesis Strategy ◽  
Vis Spectroscopy ◽  
Methods Of Synthesis ◽  
Aqueous Leaf Extract ◽  
Xrd Patterns

AbstractNanotechnology is a recent field of modern research dealing with synthesis, strategy and manipulation of particle’s structure in size range of 1–100 nm. This study introduces one of the methods of synthesis of nanoparticles, i.e., green synthesis of ZnO NPs using aqueous leaf extract of Becium grandiflorum (AM: ‘Yedegamentisie’). The biomolecules of the plant extract (such as phenols, flavonoids, saponins, glycosides, steroids, tannins and alkaloids) were used as capping and reducing agent during synthesis of ZnO NPs. Response surface methodology coupled with Box-Behnken design (RSM-BBD) was used to optimize the synthesis of ZnO NPs and adsorption studies of the as-synthesized ZnO NPs. Then, ZnO NPs was characterized using different spectroscopic and microscopic instruments such as UV–Vis spectroscopy, FTIR, XRD and SEM–EDS to consider its purity, shape and crystallinity. UV–Vis analysis showed peaks in the range 305–312 nm due to synthesis of ZnO NPs. FTIR analysis showed the availability of different phytochemicals in the plant extract and synthesis of ZnO NPs at 490 cm−1. Powder XRD patterns confirmed formation of phase pure wurtzite structures of ZnO NPs. The synthesized ZnO NPs were used to remove MB dye from aqueous solution by acting as a photocatalyst and adsorbent as well as, it also showed antimicrobial activity against two gram positive (Staphylococcus epidermidis, Staphylococcus aureus) and three gram negative (Escherichia coli, Klebsiella pneumonia, Pseudomonas aeruginosa) bacteria.

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