scholarly journals Effect of Poly Ethylene Glycol on CuO Nanoparticles and its Antibacterial Application

2016 ◽  
Vol 63 ◽  
pp. 111-118 ◽  
Author(s):  
T. Hemalatha ◽  
S. Akilandeswari
Keyword(s):  
Ethylene Glycol ◽  
Quantum Confinement Effect ◽  
Antibacterial Properties ◽  
Cuo Nanoparticles ◽  
Diffusion Method ◽  
X Ray Diffraction ◽  
Poly Ethylene Glycol ◽  
X Ray ◽  
Ft Ir ◽  
Poly Ethylene

Pure CuO nanoparticles and chemically-precipitated Poly Ethylene Glycol (PEG) used as a capping agent CuO nanocrystal continuum (0.1, 0.2, 0.3, 0.4, 0.5 gm) was anatomized for structural and morphological research using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and Field - Emission Scanning Electron Microscopy (FE-SEM). Their X-ray Diffraction (XRD) analysis manifested monoclinic crystallinity in pure and PEG-capped CuO nanorods, with an average crystallite size of 21.63nm and 13-16nm respectively. The morphological analysis revealed their structural conformation. The FT-IR spectrum affirmed the presence of Cu-O bonds. The optical property of the aforesaid nanorods was studied by UV-Visible reflectance (UV-Vis DRS). The UV analysis showed that all the capped products show signs of good optical quality in the UV region and also the absorption edge was blue shifted with a band gap of 1.85 eV for 0.4gm PEG capped as results of quantum confinement effect. The antibacterial properties of the as-prepared nanostructures investigated for various human pathogens using disc diffusion method. The result showed the significant antibacterial activity bothgram positiveandgram negativebacteria.

Thermo-Responsive Supramolecular Hybrid Hydrogels Formed by Graphene Oxide-Grafted-Poly(Ethylene Glycol) and α-Cyclodextrin

2013 ◽  
Vol 718-720 ◽  
pp. 172-175
Author(s):  
Song Hua Kong ◽  
Mi Zhou ◽  
Xiao Feng Ye ◽  
Xin Qian
Keyword(s):  
Graphene Oxide ◽  
Ethylene Glycol ◽  
Coupling Reaction ◽  
X Ray Diffraction ◽  
Poly Ethylene Glycol ◽  
Hydrogen Bond Interaction ◽  
X Ray ◽  
Hybrid Hydrogels ◽  
Poly Ethylene ◽  
Glycol Methyl Ether

Poly(ethylene glycol) methyl ether-grafted-graphene oxide (GO) was synthesized by a coupling reaction and formed inclusion complexes (ICs) after selective threading of the mPEG segments of the GO-mPEG through the cavities of α-cyclodextrins (α-CDs) units. The polypseudorotaxane structures of the as-obtained hydrogels were confirmed by X-ray diffraction, TGA, DSC, and SEM. The complexation of the mPEG segments with α-CDs and the hydrogen-bond interaction between CDs resulted in the formation of supramolecular hybrid hydrogels with a strong network. The resultant hybrid hydrogels were found to be thermo-responsive, and could be applied as a promising drug delivery system.

Gelation Crystallization of Poly(L-Lactide) in Solvents of Varying Molecular Size

2007 ◽  
Vol 15 (5) ◽  
pp. 389-393
Author(s):  
Hong Hao ◽  
Guozheng Liang ◽  
Junmin Zhao
Keyword(s):  
Differential Scanning Calorimetry ◽  
Ethylene Glycol ◽  
Crystallization Rate ◽  
Molecular Size ◽  
Large Molecule ◽  
X Ray Diffraction ◽  
Poly Ethylene Glycol ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Poly Ethylene

The crystallization behaviour of poly(L-lactide) (PLLA) samples prepared in large-molecule solvents, such as poly(ethylene glycol) (PEG), was studied by differential scanning calorimetry (DSC) and X-ray diffraction. The results indicate that those samples recovered from large-molecule solvents exhibit higher crystallinity, non-isothermal crystallization temperature and faster crystallization rate than the ones crystallized in a small-molecule solvent. The crystallinity of samples from PLLA/PEG gel is about 73% measured by the DSC. The molar size of the solvent has a large influence on the formation of helical conformations and, thereby on the crystallization rate of PLLA in solution.

Solvation Structure of Poly(ethylene glycol) in Ionic Liquids Studied by High-energy X-ray Diffraction and Molecular Dynamics Simulations

2013 ◽  
Vol 46 (6) ◽  
pp. 2369-2375 ◽  
Author(s):  
Hanako Asai ◽  
Kenta Fujii ◽  
Kengo Nishi ◽  
Takamasa Sakai ◽  
Koji Ohara ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Ionic Liquids ◽  
Ethylene Glycol ◽  
High Energy ◽  
X Ray Diffraction ◽  
Poly Ethylene Glycol ◽  
X Ray ◽  
Solvation Structure ◽  
Poly Ethylene ◽  
Dynamics Simulations

Clay/(PEG-CMC) biocomposites as a novel delivery system for ibuprofen

2020 ◽  
Vol 40 (4) ◽  
pp. 350-359
Author(s):  
Nesma Baa Belmessaoud ◽  
Naima Bouslah ◽  
Nabila Haddadine
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Ethylene Glycol ◽  
Fourier Transform Infrared Spectroscopy ◽  
Fourier Transform Infrared ◽  
Release Mechanism ◽  
X Ray Diffraction ◽  
Poly Ethylene Glycol ◽  
X Ray ◽  
Poly Ethylene

AbstractIn this study we report on the preparation and characterization of biocomposites based on a sodium montmorillonite-ibuprofen (MtIb) hybrid and neat poly(ethylene glycol), neat sodium carboxymethylcellulose or poly(ethylene glycol)-carboxymethylcellulose blend 50/50 biocomposites as drug carriers. Ib, a poorly soluble drug, was first intercalated into sodium Mt and then the resulting hybrid was compounded with the different polymeric matrices. Ib incorporation efficiency in Mt was determined by UV-visible spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction and thermal analysis. Both X-ray diffraction and differential scanning calorimetric studies revealed that the intercalation of Ib between the clay layers induced amorphization of the drug. Differential scanning calorimetry and Fourier transform infrared spectroscopy revealed the development of strong interactions between Ib and the polymer matrix. A study of the release of Ib from the synthesized biocomposites in simulated intestinal fluid (pH 7.4) was investigated. To better understand the release mechanism of drug molecules from the different carriers, several kinetic models have been applied.

Controlled Release Behaviors of Ketoprofen from Matrix Polymer of Chitosan and poly(ethylene glycol)

2013 ◽  
Vol 813 ◽  
pp. 399-402
Author(s):  
Chimsook Thitipha ◽  
Thitiphan Chimsook
Keyword(s):  
Particle Size ◽  
Controlled Release ◽  
Drug Release ◽  
Ethylene Glycol ◽  
Diffusion Method ◽  
Poly Ethylene Glycol ◽  
Matrix Polymer ◽  
Percentage Yield ◽  
Poly Ethylene ◽  
Composition Ratios

The aim of present work was to prepare floating microsphere of ketoprofen using matrix polymer of chitosan and poly (ethylene glycol) by solvent diffusion method. The floating microsphere of ketoprofen was prepared from matrix polymer of chitosan and poly (ethylene glycol) with various composition ratios and evaluated such as particle size, drug compatibility and drug release of microspheres. The scanning electron microscopy of microspheres confirmed their hollow structures with smooth surface. Formulation CPK 4 to CPK 6 exhibited the best controlled release pattern in ketoprofen. The concentration and size of poly (ethylene-glycol) affected the particle size, percentage yield and drug release of microspheres.

Biocidal activity of curcumin and cationic polymer possessing composites

2020 ◽  
Vol 35 (4-5) ◽  
pp. 389-398
Author(s):  
Tarık Eren ◽  
Gülay Baysal ◽  
Faik Doğan
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fourier Transform ◽  
Curcuma Longa ◽  
Antibacterial Properties ◽  
Fourier Transform Infrared ◽  
Diffusion Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

There is a growing interest in new type of biocidal compounds with antibacterial properties against bacteria. In this study, new antibacterial synthetic materials bearing curcumin and cationic polymers were synthesized. In the synthesis stage, the methacrylate functional cationic monomer was synthesized via the Michael addition route by using 3-acryloxy-2-hydroxypropyl methacrylate and 3-amino pyridine to obtain Monomer 1. Monomer 1 was further quaternized with hexyl bromide to obtain a cationic methacrylate functional monomer. Free-radical polymerization of Monomer 1 and methyl acrylate was conducted in the presence of azobisisobutyronitrile under dimethylformamide solvent. The composite formulation was conducted by using turmeric extract Curcuma longa (curcumin), hydroxyapatite, montmorillonite, and silver nitrate. The materials were analyzed by using the methods of X-ray diffraction, nuclear magnetic resonance, Fourier transform infrared spectroscopy, and scanning electron microscopy. The biocidal activities against the bacteria Escherichia coli, Listeria monocytogenes, Salmonella, and Staphylococcus aureus were analyzed using agar well diffusion method. From the Fourier transform infrared, X-ray diffraction, and scanning electron microscopy analysis results of the synthesized nanocomposites, it is seen that they form strong connections with the components added to the composites and form an exfoliated structure. According to the antibacterial analysis results, the nanocomposites obtained have showed a strong antibacterial resistance against E.coli, L.monocytogenes, Salmonella, and S. aureus bacteria, and the high inhibition zone areas were obtained.

Fluorescence properties of full-color-emitting BCNO phosphors synthesized under different oxygen pressure

2014 ◽  
Vol 07 (05) ◽  
pp. 1450053 ◽  
Author(s):  
Feng Zhang ◽  
Weifeng Zhang ◽  
Guoqiang Li ◽  
Yachun Wang ◽  
Hua Yuan
Keyword(s):  
Oxygen Pressure ◽  
Raw Materials ◽  
X Ray Diffraction ◽  
Poly Ethylene Glycol ◽  
New Approach ◽  
X Ray ◽  
Full Color ◽  
Emission Color ◽  
Poly Ethylene ◽  
Boron Carbon

The colorful BCNO phosphors comprised of boron, carbon, nitrogen, and oxygen atoms have been novelty synthesized by varying the environmental oxygen pressure without changing the compositions of the raw materials such as boric, urea, and poly-ethylene glycol. X-ray diffraction (XRD), fourier-transformed infrared (FTIR), and photoluminescence (PL) spectra were employed to characterize the effect of environmental oxygen pressure on the structure and PL properties of the synthesized phosphors. The results of their PL properties indicates that the emission color of these BCNO phosphors has been easily tailored for a large-range from violet to near-red regions through variations of the environmental oxygen pressure as prepared under the excitation of 365 nm. This provides a new approach to tailor the emitting colors.

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