scholarly journals Layer-By-Layer Assembled, Amphiphilic And Antibacterial Hybrid Electrospun Mat Made From Polypropylene And Chitosan Fibers

2021 ◽  
Author(s):  
Gokhan Acik ◽  
Burcu Acik ◽  
E. Agel
Keyword(s):  
Antibacterial Activity ◽  
Sem Analysis ◽  
Electrospinning Process ◽  
Layer By Layer ◽  
Scanning Calorimetry ◽  
Water Contact ◽  
E Coli ◽  
Ft Ir ◽  
Dsc Analyses ◽  
First Time

Abstract In this study, hybrid fiber mat (HFPP-CS) consisting of both chlorinated polypropylene and chitosan fibers (FPP-Cl and FCS) is obtained by assembling layer-by-layer (LBL) for the first time using electrospinning process. Morphological, wettability, structural and thermal properties of HFPP-CS are investigated in detail by Scanning electron microscopy (SEM), water contact angle (WCA) measurement, fourier transform infrared (FT-IR) spectroscopy, thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) analyses, respectively, comparing with FPP-Cl and FCS. Furthermore, the antibacterial activity of all samples was evaluated against to gram positive Staphylococcus aureus (S. aureus) and gram negative Escherichia coli (E. coli) bacteria. SEM analysis proves to HFPP-CS has a circular and smooth morphology and also comprises of microscale FPP-Cl and nanoscale FCS layers. The incorporation of nano-FCS layer on micro-FPP-Cl layer leads to diminution in the hydrophobicity, but enhancement in the thermostability and glass transition temperature of the resulting fiber mat. The antibacterial activity results show that HFPP-CS has inhibition effect against to S. aureus and E. coli. In general, it is anticipated that the prepared amphiphilic and antibacterial HFPP-CS can be employed as potential biomaterial for a variety of bioengineering applications.

Temperature Dependent On Activated Carbon For Their Biological Activity And Photocatalytical Degradation of Methylene Blue: A Novel Approach To Green Synthesis

2021 ◽  
Author(s):  
Amalanathan.M ◽  
Aravind.M ◽  
Sony Michael Mary.M ◽  
Razan A. Alshgari ◽  
Asma A. Alothman ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Antibacterial Activity ◽  
Activated Carbon ◽  
Hydrothermal Carbonization ◽  
Microbial Pathogens ◽  
X Ray Diffraction ◽  
E Coli ◽  
Novel Approach ◽  
Transmission Electron ◽  
Ft Ir

Abstract In this work, jasmine flower derived activated carbon were successfully synthesized by hydrothermal carbonization process at the different annealing temperature. The Crystallinity, phase, structural, morphological and optical properties of activated carbon were investigated using X-ray diffraction (XRD), Fourier Transform Infrared spectroscopy (FT-IR), Scanning electron microscopy (SEM), Transmission electron microscope (TEM), and UV-visible spectroscopy analysis. The graphitic phase of carbon was obtained from the XRD pattern. Surface morphology reveals irregular-shaped nanoparticles. The photodegradation of methylene blue (MB) was carried out under the visible light irradiation technique to study its photocatalytic activity. The activated carbon obtained at 400oC, 500oC and 600oC shows a photocatalytic degradation efficiency of 86%, 90%, and 94%, respectively. Antibacterial activity of activated carbon was examined against S. Aureus (MTCC-737) and E-Coli (MTCC- 443) microbial pathogens, and their potent antibacterial activity was examined from the zone of inhibition layer.

scholarly journals Synthesis of a New Conjugates of Imidazole wih Beta Lactam Moiety and Evaluation of its Expanded Antibacterial Activity

2018 ◽  
Vol 34 (5) ◽  
pp. 2495-2501 ◽  
Author(s):  
Sarmd D. Noori ◽  
Mazin N. Mousa ◽  
Shaker A. N. Al-Jadaan
Keyword(s):  
Antibacterial Activity ◽  
Chemical Structure ◽  
Bacterial Species ◽  
Anaerobic Bacteria ◽  
Diffusion Method ◽  
Disc Diffusion ◽  
Beta Lactam ◽  
Disc Diffusion Method ◽  
E Coli ◽  
Ft Ir

Five compounds containing (2,4,5-triphenyl triphenyl-1H-) and azetidinone (beta-lactam) moiety were synthesized. The physical data and yield of synthesized compounds were recorded, the chemical structure of prepared compounds were characterized using FT-IR, 1H-NMR and elemental analysis. The antibacterial activity was evaluated using disc diffusion method that involve tow Gram positive (staph. aureus, E. Faecalis), two Gram negative (E. coli and ‎K. pneumoniae), and one anaerobic bacteria (streptococcus. Pyogen). Different concentration of the prepared compounds has been used, and the obtained result were compared with standard (ceftazidime). Compound (5c) showed the best antibacterial activity against all bacterial species while 5a and 5e does not. Other compounds showed activity against some species.

scholarly journals Synthesis of a Cationic Polyacrylamide under UV Initiation and Its Flocculation in Estrone Removal

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Jiaoxia Sun ◽  
Xiqin Ma ◽  
Xiang Li ◽  
Jianxin Fan ◽  
Qingkong Chen ◽  
...  
Keyword(s):  
Ammonium Chloride ◽  
Removal Rate ◽  
Phenyl Group ◽  
Resonance Spectroscopy ◽  
Scanning Calorimetry ◽  
Floc Size ◽  
Cationic Polyacrylamide ◽  
H Nmr ◽  
Ft Ir ◽  
Dsc Analyses

A ternary cationic polyacrylamide (CPAM) with the hydrophobic characteristic was prepared through ultraviolet- (UV-) initiated polymerization technique for the estrone (E1) environmental estrogen separation and removal. The monomers of acrylamide (AM), acryloyloxyethyl-trimethyl ammonium chloride (DAC), and acryloyloxyethyl dimethylbenzyl ammonium chloride (AODBAC) were used to synthesize the ternary copolymer (PADA). Fourier transform infrared spectroscopy (FT-IR), 1H nuclear magnetic resonance spectroscopy (1H NMR), thermogravimetry/differential scanning calorimetry (TG/DSC), and scanning electron microscopy (SEM) were employed to characterize the structure, thermal decomposition property, and morphology of the polymers, respectively. FT-IR and 1H NMR results indicated the successful formation of the polymers. Besides, with the introduction of hydrophobic groups (phenyl group), an irregular and porous surface morphology and a favorable thermal stability of the PADA were observed by SEM and TG/DSC analyses, respectively. At the optimal condition (pH = 7, flocculant dosage = 4.0 mg/L and E1 concentration = 0.75 mg/L), an excellent E1 flocculation performance (E1 removal rate: 90.1%, floc size: 18.3 μm, and flocculation kinetics: 22.69×10-4 s−1) was acquired by using the efficient flocculant PADA-3 (cationic degree = 40%, and intrinsic viscosity = 6.30 dL·g−1). The zeta potential and floc size analyses were used to analyze the possible flocculation mechanism for the E1 removal. Results indicated that the charge neutralization, adsorption, and birding effects were dominant in the E1 removal progress.

scholarly journals Synthesis of V2O3/C composites with different morphologies by a facile route and phase transition properties of the compounds

2014 ◽  
Vol 32 (2) ◽  
pp. 236-242 ◽  
Author(s):  
Yifu Zhang ◽  
Nannan Wang ◽  
Yuting Huang ◽  
Chi Huang ◽  
Xiao Mei ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Phase Transition ◽  
Hydrothermal Route ◽  
Scanning Calorimetry ◽  
Transmission Electron ◽  
Facile Hydrothermal Route ◽  
Potential Applications ◽  
Subsequent Calcination ◽  
Ft Ir ◽  
First Time

AbstractV2O3 and amorphous carbon composites (V2O3/C composites) with different morphologies (e.g. nanospheres, nanorods and nanosheets) were, for the first time, successfully synthesized by a facile hydrothermal route and subsequent calcination. The as-obtained samples were characterized by X-ray powder diffraction (XRD), energy dispersive spectrometery (EDS), elemental analysis (EA), Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The morphology of V2O3/C composites could be easily controlled by varying the reaction time, and, as a result, V2O3/C composites with nanospheres, nanorods and nanosheets were selectively synthesized. Furthermore, the phase transition property of V2O3/C composites was measured by differential scanning calorimetry (DSC), suggesting that V2O3/C composites exhibit the phase transition similar to V2O3, which could expand the potential applications of materials related to V2O3 in the future.

scholarly journals Nonwoven Bio-Based Membranes for Removal of Micropollutants from Aqueous Water

2021 ◽  
Vol 57 (4) ◽  
pp. 34-44
Author(s):  
Ecaterina Matei ◽  
Cristina Ileana Covaliu ◽  
George Coman ◽  
Mihai Negroiu ◽  
Maria Rapa ◽  
...  
Keyword(s):  
Electrospinning Process ◽  
Attenuated Total Reflectance ◽  
Scanning Calorimetry ◽  
Chemical Methods ◽  
Physical Chemical ◽  
Activated Coal ◽  
Solid Suspension ◽  
Electrospun Membranes ◽  
Ft Ir

The aim of this paper is to obtain two types of bio-based membranes by electrospinning process: one based on polylactic acid (PLA), and PLA/polyhydroxybutyrate (PHB), and the second by coating the PLA/PHB membrane with chitosan (CS) and CS/activated coal (AC), respectively for removal of micropollutants from aqueous water. The designed bio-based electrospun membranes were analyzed through scanning electron microscopy (SEM), attenuated total reflectance (ATR) - Fourier transform infrared spectroscopy (FT-IR), differential scanning calorimetry (DSC), the removal of solid suspension and Pb (II) from aqueous water. The quality of filtrates was evaluated by physical-chemical methods, while the retaining of Pb (II) from wastewaters was reported.

scholarly journals Development and Evaluation of Antimicrobial and Modulatory Activity of Inclusion Complex of Euterpe oleracea Mart Oil and β-Cyclodextrin or HP-β-Cyclodextrin

2020 ◽  
Vol 21 (3) ◽  
pp. 942 ◽  
Author(s):  
Thalita Sévia Soares de Almeida Magalhães ◽  
Pollyana Cristina de Oliveira Macedo ◽  
Stephany Yumi Kawashima Pacheco ◽  
Sofia Santos da Silva ◽  
Euzébio Guimarães Barbosa ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Inclusion Complexes ◽  
Biological Response ◽  
Physicochemical Characteristics ◽  
Euterpe Oleracea ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
E Coli ◽  
Nonpolar Compounds ◽  
Euterpe Oleracea Mart

The development of inclusion complexes is used to encapsulate nonpolar compounds and improve their physicochemical characteristics. This study aims to develop complexes made up of Euterpe oleracea Mart oil (EOO) and β-cyclodextrin (β-CD) or hydroxypropyl-β-cyclodextrin (HP-β-CD) by either kneading (KND) or slurry (SL). Complexes were analyzed by molecular modeling, Fourier-transform infrared spectroscopy, scanning electron microscopy, powder X-ray diffraction, thermogravimetry analysis and differential scanning calorimetry. The antibacterial activity was expressed as Minimum Inhibitory Concentration (MIC), and the antibiotic resistance modulatory activity as subinhibitory concentration (MIC/8) against Escherichia coli, Streptomyces aureus, Pseudomonas aeruginosa and Enterococcus faecalis. Inclusion complexes with β-CD and HP-β-CD were confirmed, and efficiency was proven by an interaction energy between oleic acid and β-CD of −41.28 ± 0.57 kJ/mol. MIC values revealed higher antibacterial activity of complexes compared to the isolated oil. The modulatory response of EOO and EOO-β-CD prepared by KND as well as of EOO-β-CD and EOO-HP-β-CD prepared by SL showed a synergistic effect with ampicillin against E. coli, whereas it was not significant with the other drugs tested, maintaining the biological response of antibiotics. The antimicrobial response exhibited by the complexes is of great significance because it subsidizes studies for the development of new pharmaceutical forms.

Synthesis, Characterization and Antibacterial Activity of Chitosan/TiO2 Microspheres

2014 ◽  
Vol 912-914 ◽  
pp. 362-365
Author(s):  
Wen Ying Qi ◽  
Sai Sai Chen ◽  
Dan Yang ◽  
Qin Long Li ◽  
Xiao Rong Wu ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Titanium Dioxide ◽  
Entrapment Efficiency ◽  
Aldehyde Group ◽  
Cross Linking ◽  
Amino Groups ◽  
E Coli ◽  
Ft Ir ◽  
Stretching Vibrations ◽  
Mic Value

In this study, chitosan (CS)/titanium dioxide (TiO2) microspheres with different nanoTiO2 content were obtained by suspension cross-linking technique and characterized by FT-IR and SEM. The strong peak of C=N stretching vibrations at 1641 cm-1 were found which demonstrated that amino groups of CS reacted with aldehyde group of glutaraldehyde. SEM photographs showed that the CS/TiO2 microspheres were spherical, and the size of the CS/TiO2 microspheres ranging from 50 to 170 μm was analyzed with the software of Image J. The entrapment efficiency of the CS/TiO2 microspheres was up to 67.7%. Compared with CS, CS/TiO2 microspheres had better antibacterial activity against S. aureus and E. coli with a MIC value of 0.0125%.

New Strategy toward Novel Hyperbranched Phenol-Formaldehyde Resin: Synthesis, Characterization and Curing Study

2007 ◽  
Vol 29-30 ◽  
pp. 177-180
Author(s):  
Samaresh Ghosh
Keyword(s):  
Phenol Formaldehyde ◽  
Flow Behavior ◽  
Phenol Formaldehyde Resin ◽  
Formaldehyde Resin ◽  
Scanning Calorimetry ◽  
Elemental Analyses ◽  
New Strategy ◽  
Ft Ir ◽  
First Time ◽  
Tof Ms

Novel hyperbranched phenol-formaldehyde (HBPF) resin 1 has been prepared for the first time. Thorough characterizations (FT-IR, NMR, HPLC, MALDI-TOF MS and elemental analyses and rheological flow behavior) were performed to ascertain the structure of HBPF 1. The condensationcuring event of HBPF with diglycidylether of bisphenol-A (DGEBA) has been studied by differential scanning calorimetry (DSC) technique.

scholarly journals The Radiation Sterilization of Ertapenem Sodium in the Solid State

Molecules ◽  
2019 ◽  
Vol 24 (16) ◽  
pp. 2944
Author(s):  
Karolina Kilińska ◽  
Judyta Cielecka-Piontek ◽  
Robert Skibiński ◽  
Daria Szymanowska ◽  
Andrzej Miklaszewski ◽  
...  
Keyword(s):  
Solid State ◽  
Physicochemical Properties ◽  
High Performance ◽  
Degradation Products ◽  
Radiation Sterilization ◽  
Scanning Calorimetry ◽  
Beam Radiation ◽  
Promising Alternative ◽  
Ft Ir ◽  
First Time

For the first time, the influence of ionising radiation on the physicochemical properties of ertapenem in solid state was studied. During our studies, we evaluated the possibility of applying radiosterilization to obtain sterile ertapenem. Spectroscopic (Fourier Transform Infrared (FT-IR)), thermal (differential scanning calorimetry (DSC), chromatography (High-Performance Liquid Chromatography (HPLC) and HPLC-MS), and X-ray powder diffraction (XRPD) studies shown that irradiation of ertapenem with the 25 kGy, the dose required to achieve sterility, does not change the physicochemical properties of the studied compound. The antimicrobial activity of ertapenem irradiated with the dose of 25 kGy was only reduced for one species. Based on the received results, we can conclude that radiostelization is a promising alternative method of obtaining sterile ertapenem. In our studies, ertapenem was also exposed to e-beam radiation with a dose of 400 kGy. It was determined that two novel degradation products that are structurally differently to degradants formed during hydrolysis and thermolysis.

Natural mulberry biomass fibers doped with silver as an antimicrobial textile: a new generation fabric

2021 ◽  
pp. 004051752110134
Author(s):  
Touseef Amna ◽  
M. Shamshi Hassan ◽  
Faheem A Sheikh ◽  
Hae Cheon Seo ◽  
Hyun-Chel Kim ◽  
...  
Keyword(s):  
Fibrous Composite ◽  
Bactericidal Effect ◽  
Dip Coating ◽  
Sem Analysis ◽  
X Ray Diffraction ◽  
Environment Friendly ◽  
E Coli ◽  
Dip Coating Technique ◽  
New Generation ◽  
First Time

In this study, silver-doped natural mulberry fibers were successfully obtained by the dip-coating technique. Arrays of material consisting of synthetic compounds (organic as well as inorganic) are being utilized to impart antimicrobial functionality to textiles. Therefore, the current study for the first time attempted to establish an innovative class of textiles made up of silver-doped natural mulberry fibers. This fabric will be utilized for the fabrication of antimicrobial socks. The morphology, physicochemical and antibacterial characteristics of Ag-doped mulberry fibers were scanned via X-ray diffraction (XRD), scanning electron microscopy (SEM), electron probe microanalysis, Fourier transform infrared spectroscopy (FTIR) and antibacterial testing. SEM analysis evidently demonstrated uniform distribution of Ag on mulberry fibers and the outcome of XRD and FTIR analyses authenticated assimilation of Ag in the Ag-doped mulberry composite. The Ag-doped mulberry fibers revealed venerable antibacterial action against representative bacterium E. coli. The antibacterial analysis lead to the conclusion that the Ag-doped mulberry fiber textile has an enhanced bactericidal effect owing to the synergism of Ag and mulberry compounds. Moreover, Ag imparted an anti-odor effect on mulberry fiber. These distinctive organic–inorganic fibrous composite socks are antimicrobial, odor free and skin and environment friendly. Thus, this study recommends the use of Ag-doped mulberry fibers as a future material for the preparation of durable antibacterial new generation socks. These composite fibers can also be used as textile material for clothes such as sportswear and for medical purposes; for instance, bedcovers in hospital beds, etc.

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