Novel Antibacterial Nanofibers of Chitosan and Polyurethane Prepared by Electrospinning

2010 ◽  
Vol 150-151 ◽  
pp. 1452-1456 ◽  
Author(s):  
Wei Min Kang ◽  
Bo Wen Cheng ◽  
Quan Xiang Li ◽  
Fang Fang Zuo
Keyword(s):  
Tissue Engineering ◽  
Extracellular Matrix ◽  
Antibacterial Activity ◽  
Fourier Transform ◽  
Electron Microscope ◽  
Average Diameter ◽  
Chitosan Concentration ◽  
Ft Ir ◽  
First Time ◽  
Scanning Electron

The chitosan(CS)/polyurethane(PU) blend nanofibers have been prepared for the first time by electrospinning. Formic acid (FA) and Hexafluoroisopropanol (HFIP) were found to be the co-solvent for electrospinning. The CS/PU blend solutions in various ratios were studied for electrospinning into nanofibers. The diameter and morphology of the fibers were shown by scanning electron microscope (SEM). It was found that the average diameter of the chitosan/PU blend fibers became larger, and the morphology of the fibers became finer with the content of PU increasing. To show the molecular interactions, CS/PU fibers were characterized by Fourier transform infrared spectroscopy (FT-IR). Moreover, the antibaterial activity of blend nanofibers against Escherichia coil (E.coil) was measured via optical density method. The blend nanofibers exhibited satisfying antibacterial activity against E.coil, even the chitosan concentration was only 5wt%. Therefore, the spun nanofibers are expected to be used in the native extracellular matrix for tissue engineering.

Study on Preparation and Performance of γ-Ray Protection Coating

2011 ◽  
Vol 418-420 ◽  
pp. 835-839 ◽  
Author(s):  
Yuan Lin Zhou ◽  
Xiao Na Zhu ◽  
Ying Jun Li ◽  
Shao Tao Zheng ◽  
Li Li
Keyword(s):  
Contact Angle ◽  
Fourier Transform ◽  
Electron Microscope ◽  
Average Diameter ◽  
Atomic Force ◽  
Ft Ir ◽  
Γ Ray ◽  
And Performance ◽  
Protection Coating ◽  
Scanning Electron

A kind of novel protective coating was prepared by using super-hydrophobic PbWO4 nanocrystals as functional stuffing. The samples were characterized systematically by means of scanning electron microscope (SEM), contact angle analyzer, atomic force microscope (AFM) and Fourier transform infrared spectroscopy(FT-IR). The effects of various amount of nano-PbWO4 particles on shielding ratio to 59.5 keV γ-ray were also discussed. The results revealed that the average diameter of PbWO4 nanocrystals were about 32nm. The contact angle between the modified PbWO4 and water was amounted to 153.08°, which showed that the modified PbWO4 owned super hydrophobic surfaces. The modified PbWO4 had good dispersion and stability in organic solvents. Chemistry reaction happened between components of coatings and nano-PbWO4 particles, thus it showed good compatibility with binders. The shielding ratio to γ-ray was up to 32%, and the hardness and levelling property was greatly improved.

scholarly journals Ciprofloxacin Based on Carrier Double Layered Hydroxide Nano-particles of Fe+3/Fe+2, Fe+3/Ni+2, Al+3/Fe+2, and Al+3/Ni+2 Ions

2020 ◽  
Vol 10 (01) ◽  
pp. 119-126
Author(s):  
Noor M. Mohammed ◽  
Farah AH. Kadhim ◽  
Aseel A. Hammood ◽  
Ashour H. Dawood
Keyword(s):  
Fourier Transform ◽  
Electron Microscope ◽  
Nano Particles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Atomic Force ◽  
Ft Ir ◽  
Double Layered Hydroxide ◽  
Scanning Electron ◽  
Ft Ir Spectroscopy

The double-layered hydroxide nano-particles compounds with ciprofloxacin drug were carried out by preparation of the double layered hydroxide (DLH) of M+3/M+2 ions for selective ions. The ciprofloxacin drug was inserted between them. The resulted compounds were characterized by X-Ray diffraction (XRD), scanning electron microscope (SEM), atomic force microscope (AFM), and Fourier Transform Infrared (FT-IR) spectroscopy; the antibacterial studied done by using the gram (+) and gram (-) pigments.

Effect of PEO on the Hydrophilicity of PLLA Ultrafine Fibers

2012 ◽  
Vol 535-537 ◽  
pp. 2390-2393
Author(s):  
Jia Xu ◽  
Jin Xian Wang ◽  
Xiang Ting Dong ◽  
Gui Xia Liu ◽  
Wen Sheng Yu
Keyword(s):  
Tissue Engineering ◽  
Extracellular Matrix ◽  
Contact Angle ◽  
Lactic Acid ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Polyethylene Oxide ◽  
Water Contact ◽  
Ultrafine Fibers ◽  
Scanning Electron

The Polyethylene oxide (PEO) / Poly (L-lactic acid) (PLLA) ultrafine blend fibers have been prepared by electrospinning. The hybrid solvent of trichloromethane and ethanol was found to be the co-solvent for electrospinning. The PEO/PLLA blend solutions in various ratios were studied for electrospinning into ultrafine fibers. The morphology of the fibers was shown by scanning electron microscope (SEM). The hydrophilicity of fiber samples was characterized by determining their water contact angle. The spun ultrafine fibers are expected to be used in the native extracellular matrix for tissue engineering.

scholarly journals Preparation of Sensitivity Test Antibiotic Discs Using Some Nanomaterials to Detect Resistance of Pseudomonas Aergenosa to Some Antibiotics

2021 ◽  
Vol 8 (2) ◽  
Author(s):  
Zainab J. Ghaneim ◽  
May M. Ismzil ◽  
Ilham Khalaf ◽  
Juan F. Mustafa ◽  
Shatha A. Mahmood ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Pseudomonas Aeruginosa ◽  
Antibacterial Activity ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Average Diameter ◽  
Scanning Electron Microscope Analysis ◽  
Electron Microscope Analysis ◽  
Scanning Electron

This study was conducted to synthesize bentonite nanoparticles and load them on different antibiotics to increase the effectiveness of the antibiotics or treat the resistance of Pseudomonas aeruginosa to some types of antibiotics in the laboratory. The biosynthesized bentonite nanoparticles were characterized by spectrophotometry and scanning electron microscopy. Their antibacterial activity against Pseudomonas aeruginosa was determined by the (muller-hinton) method of diffusion in plates compared with antibiotics using different concentrations of each ranging from 12.5-200 µg/ml. The results of this study showed that it is possible to synthesize bentonite nanoparticles in an easy and environmentally friendly manner, and the maximum absorption spectra of these nanoparticles were at 420 and 430 nm using a spectrophotometer. The scanning electron microscope analysis also showed that the average diameter of these particles was 26 nanometers, in addition to their high activity against bacteria.

scholarly journals CHARACTERIZATION AND HYPOGLYCEMIC STUDY OF ISOLATED NATURAL POLYMER FROM THE STEM OF MANILKARA HEXANDRA (ROXB.) DUBARD

2019 ◽  
pp. 206-213
Author(s):  
IRUDAYA MONISHA S. ◽  
ROSALINE VIMALA J.
Keyword(s):  
Fourier Transform ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Moisture Content ◽  
Natural Polymer ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ft Ir ◽  
Scanning Electron

Objective: In the present study, the isolated natural polymer from the stem of Manilkara hexandra and their physiochemical parameters were investigated. It is further involved in hypoglycemic studies. Methods: The gum exudates were screened for phytochemicals, physicochemically analyzed for solubility, pH, total ash, moisture content, acid insoluble ash, water soluble ash, sulfated ash, flow property, and it is characterized by Fourier Transform Infrared analysis (FT-IR), Scanning Electron Microscope (SEM), X-ray diffraction analysis (XRD), Nuclear Magnetic Resonance (NMR) studies (13Carbon and 1Proton) and it was examined in vitro studies by hypoglycaemic activity. Results: The isolated gum extracted from the stem of Manilkara hexandra (Roxb.) Dubard ash values were found to be low. The gum is found to be hygroscopic in nature due to its high moisture content (0.9131±0.03). Fourier Transform Infrared (FT-IR) spectra show relevant functional groups for gum, which is further confirmed by resonance spectral studies. The X-ray diffraction (XRD) pattern shows that the gum is amorphous as well as crystalline in nature. Scanning Electron Microscope (SEM) image confirms that the gum particles have irregular size and shape. Sugar composition analysis by Thin Layer Chromatography indicated the presence of rhamnose, arabinose. The in vitro study of hypoglycemic activity shows the best report compared with the standard. The experimental evidence offers scope to use this natural polymer in the food and pharmaceutical industry. Conclusion: The isolated natural polymer shows good result in hypoglycemic studies compared with standard.

scholarly journals Surface modified nano-zeolite used as carrier for slow release of sulphur

2014 ◽  
Vol 6 (1) ◽  
pp. 19-26 ◽  
Author(s):  
M. Thirunavukkarasu ◽  
K. S. Subramanian
Keyword(s):  
Raman Spectroscopy ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Electron Microscope ◽  
Slow Release ◽  
Percolation Reactor ◽  
Sulphur Fertilizer ◽  
Ft Ir ◽  
Surface Modified ◽  
Scanning Electron

Surface modified nano-zeolite (SMNZ) was used as carrier to develop nano-zeolite based nano-sulphur fertilizer. A laboratory study on sulphur nano-fertilizer and conventional sulphur fertilizer were studied with percolation reactor system to evaluate the slow release of sulphur from both fertilizers in ambient temperature. SMNZ and sulphur nano-fertilizer were characterized using Fourier Transform Infrared Spectroscopy (FT-IR), Zeta Analyzer, Raman Spectroscopy, XRD and Scanning Electron Microscope (SEM). Raman spectroscopy confirmed the sulphur attachment at 480 cm-1 in the SMNZ. The FTIR spectra at 1030 cm-1 confirmed the sulphate attachments in the SMNZ spectrum. Zeta analyzer showed the surface charge of sulphur nano-fertilizer had (-) 52.6 mV. SEM imaged the sulphur loaded SMNZ in irregular flake like structure. A comparative study of the release of sulphate (SO4 2-) from fertilizer-loaded SMNZ and (NH4)2 SO4 fertilizers were performed using the percolation reactor. The results showed that the SO42- supply from fertilizer-loaded SMNZ was available even after 912 h of continuous percolation, whereas SO42- from (NH4)2 SO4 was exhausted within 384 h. These properties suggest that SMNZ has a great potential as the fertilizer carrier for slow release of SO42-.

scholarly journals Penghambatan Interaksi Eutektik Akibat Energi Kompresi dengan Penambahan Pati Jagung

2018 ◽  
Vol 5 (1) ◽  
pp. 17
Author(s):  
Dwi Setyawan ◽  
Noorma Rosita ◽  
Diajeng Putri Paramita ◽  
Dicky Pratama
Keyword(s):  
Thermal Analysis ◽  
Tensile Strength ◽  
Fourier Transform ◽  
Differential Thermal Analysis ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Fourier Transform Infrared ◽  
Ft Ir ◽  
Scanning Electron

Penelitian ini dilakukan untuk mengetahui penghambatan interaksi eutektik yang terjadi pada pengempaan campuran biner ibuprofen-asam stearat dengan penambahan pati jagung. Pati jagung ditambahkan ke dalam campuran biner ibuprofen-asam stearat 40:60 (% b/b) dengan komposisi 10, 20, dan 30% (b/b) kemudian dikempa. Karakterisasi fisik tablet kempa dilakukan menggunakan analisis kekuatan mekanik, differential thermal analysis (DTA), difraksi sinar-X serbuk (DSXS), spektroskopi fourier transform infrared (FT-IR), dan scanning electron microscope (SEM). Uji kekuatan mekanik menunjukkan penambahan pati jagung 10 dan 20% menyebabkan penurunan nilai tensile strength dibandingkan campuran biner. Penambahan 20% pati jagung menyebabkan pergeseran puncak ke sudut 2Ɵ lebih besar disertai dengan penurunan intensitas difraksi sinar-X. Analisis termal tablet kempa campuran biner-pati jagung 20% menunjukkan peningkatan titik lebur eutektik dan spektra FT-IR yang dihasilkan tidak berbeda dibandingkan dengan tablet kempa campuran biner. Mikrofoto SEM menunjukkan penambahan pati jagung 20% dapat mencegah terjadinya sintering pada tablet kempa ibuprofen-asam stearat. Hasil karakterisasi fisik mengindikasikan bahwa pati jagung dapat meredam pembentukan eutektik akibat energi kompresi antara ibuprofen-asam stearat pada komposisi 20% (b/b)

Effect of Curing Temperature on Degree Imidization of Melamine-BPADA Hyperbranched Polyimide Studied by FT-IR

2015 ◽  
Vol 754-755 ◽  
pp. 251-255 ◽  
Author(s):  
Muhammad Bisyrul Hafi Othman ◽  
Hazizan Md. Akil ◽  
Hasnah Osman ◽  
Zulkifli Ahmad
Keyword(s):  
Fourier Transform ◽  
Electron Microscope ◽  
Hydrochloric Acid ◽  
Annealing Temperature ◽  
Main Chain ◽  
Curing Temperature ◽  
X Ray ◽  
Thermal Imidization ◽  
Ft Ir ◽  
Scanning Electron

We has synthesized hyperbranched polyamides (HPI) series containing s-triazine rings derived from melamine in the main chain, according to A3 + B2 approach which involving the emulsion polymerization reactions of melamine in hydrochloric acid and stepwise thermal imidization. The effect of curing temperature on the degree of imidization (DI) films of Melamine-BPADA (4,4'-(4,4'-Isopropylidenediphenoxy) bis (phthalic anhydride) has been examined by using the techniques of FTIR (Fourier transform infrared) and SEM-EDX (Scanning Electron Microscope-Electron Diffaction X-Ray). The DI varied significantly with annealing temperature before the films were fully cured. The Melamine-BPADA film was nearly fully cured when annealed at 180 °C, while the same was revealed for SEM-EDX. The morphology of the Melamine-BPADA film did not vary with annealing at temperatures and the FTIR experiment fairly match those from the SEM-EDX.

Shape Controllable Preparation of PbS Crystal by a Simple Solvothermal Method

2013 ◽  
Vol 820 ◽  
pp. 11-14
Author(s):  
Zhong Biao Zhao ◽  
Peng Wang ◽  
Li Bo Fan ◽  
Zi Fa Chen ◽  
Chun Meng Wang
Keyword(s):  
Fourier Transform ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Lead Sulfide ◽  
Solvothermal Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ft Ir ◽  
Controllable Preparation ◽  
Scanning Electron

Hierarchical eight-arm, star-shaped lead sulfide (PbS) crystals have been successfully synthesized by a simple hydrothermal method. When pyridine was used as solvent, candy-like PbS crystal was obtained. The samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and Fourier transform-infrared (FT-IR) measurements.

SCANNING ELECTRON MICROSCOPE: POSSIBILITIES FOR STUDYING KIDNEY DISEASES

2020 ◽  
pp. 176-182
Author(s):  
Mamaeva S.N. ◽  
Vinokurov R.R. ◽  
Munkhalova Ya.A. ◽  
Dyakonova D.P. ◽  
Platonova V.A. ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Red Blood Cells ◽  
Blood Cells ◽  
Filtration Rate ◽  
Kidney Diseases ◽  
First Time ◽  
Scanning Electron

Currently, due to the intensive development of high-tech science-intensive medical and research devices, more and more attention is paid to the development of diagnostics of rare and difficult to diagnose diseases. It is known that among numerous nephropathies, hematuria may be the only symptom of kidney and urinary tract diseases, which complicates their diagnosis and treatment. In order to develop new approaches for the diagnosis of nephropathies, the authors have been studying the morphology of red blood cells in the blood and urine of children and adults using a scanning electron microscope for several years. The paper presents the results of studies of children with various kidney diseases, including IgA-nephropathy, and chronic glomerulonephritis. Scanning electron microscopy was used for the first time to detect nanoparticles on the surface of red blood cells, the size of which is comparable to the size of viruses, which became the basis for one of the authors ' assumptions, namely, the possible transport of certain types of viruses by red blood cells. Thus, some kidney diseases could be considered virus-associated. This paper presents for the first time the results of determining the glomerular filtration rate of both kidneys separately in the study of separate kidney function and of the study of urine smears obtained during catheterization of the ureters in patients with hydronephrosis of one of the kidneys by scanning electron microscopy. As in previous studies, nanoparticles were found on the surface of red blood cells, which leads to the conclusion about the possible viral nature of the disease of the considered patient. In addition, smear images obtained using a microscope showed a significant difference in the elements of the right and left kidneys urine, which did not contradict the data on the study of glomerular filtration rate. According to the authors, the capabilities of the scanning electron microscope can be applied in fundamental research of kidney diseases at the cellular and molecular levels, forming new ideas about their origin, as well as on the basis of which new methods of non-invasive diagnostics can be built.

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