Hyperbranched polymer nanofibrous membrane grafted with silver nanoparticles for dual antifouling and antibacterial properties against Escherichia coli, Staphylococcus aureus and Pseudomonas aeruginosa

In this study, a series of Ag-loaded hyperbranched polyethyleneimine/polyethersulfone (HPEI/PES) nanofibrous membranes were prepared via electrospinning. Hyperbranched polyethyleneimine was used as a dispersant and capping agent by the chelation of Ag ions by its internal imine groups and due to its highly branched structure. The nanofibrous membranes were characterised using scanning electron microscopy (SEM) coupled with energy dispersive X-ray (EDX), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), X-ray diffraction (XRD), pure water flux and contact angle measurements. The SEM images revealed smooth, dense and uniform nanofibres with average diameters ranging from 107.8 ± 46.2 to 145.9 ± 49.9 nm. Spherical AgNPs with an average diameter of 6.4 ± 2.3 nm were observed. Characterisation using XRD coupled with selected area electron diffraction (SAED) confirmed that the AgNPs were crystalline with a peak corresponding to the (111) crystal lattice. The modified nanofibrous membranes displayed a high pure water flux of up to 630.14 ± 10.25 L/m2.h. The modified nanofibrous membranes displayed excellent antibacterial properties against Escherichia coli, Staphylococcus aureus and Pseudomonas aeruginosa achieving an inhibition of growth rate (IR) ≥ 99%. It was also found that the modified nanofibrous membranes prevented the attachment and colonisation of the three bacterial species. The antifouling ch...
Source: Reactive and Functional Polymers - Category: Chemistry Source Type: research

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Publication date: Available online 14 February 2020Source: Journal of Molecular StructureAuthor(s): Norasteh Rashidi, Mohammad Jaafar Soltanian Fard, Payam Hayati, Jan Janczak, FatemehYazdianAbstractMononuclear Zinc (II) compound –based nano-structure with [Zn(L)2(CH3COO)2] {as compound 1} formulation was synthesized by reacting ligand 2-Amino-3-Methyl pyridine with Zinc (II) acetate dihydrate and potassium iodide via sonochemical method and characterized by scanning electron microscopy (SEM), X-ray powder diffraction (XRPD), infrared spectroscopy (IR) and elemental analyses. Single crystal X-ray diffraction was used...
Source: Journal of Molecular Structure - Category: Molecular Biology Source Type: research
ConclusionsThe EO from C. camphora showed anti-MRSA activity via damaging cell membranes and disturbing the amino metabolism.Graphical abstract
Source: Journal of Ethnopharmacology - Category: Drugs & Pharmacology Source Type: research
Encapsulation of essential oil components with methyl-β-cyclodextrin using ultrasonication: Solubility, characterization, DPPH and antibacterial assay. Ultrason Sonochem. 2020 Feb 07;64:104997 Authors: Siva S, Li C, Cui H, Meenatchi V, Lin L Abstract Essential oils derived from medicinal plants are prosperous sources of active components having high biological potential. Cuminaldehye and isoeugenol, are hydrophobic essential oil components (EOC), are showing drastic limitations in their applications by low water solubility and the respective volatility. Methyl-β-cyclodextrin inclusion comple...
Source: Ultrasonics Sonochemistry - Category: Chemistry Authors: Tags: Ultrason Sonochem Source Type: research
Publication date: March 2020Source: Colloid and Interface Science Communications, Volume 35Author(s): Nida Khan, Deepak Kumar, Pramendra KumarAbstractGuar gum/Gelatin/Silver nanocomposite (GG/Gl/Ag-N-composite) was synthesized thoroughly in greenway via simple in situ method by maltose sugar reduction using the varying concentration of AgNO3 solution. The synthesized composite was characterized by Fourier Transform Infrared (FT-IR) spectroscopy, Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM) and X-rays diffraction (XRD) analysis. The synthesized composites were tested for antibacterial activity ...
Source: Colloids and Interface Science Communications - Category: Nanotechnology Source Type: research
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Source: Materials Letters - Category: Materials Science Source Type: research
Abstract N-carboxyethylchitosan (CECS) was successfully prepared via Michael addition reaction of chitosan (CS) with acrylic acid in water. The structure of CECS was characterized by Fourier transform Infra-Red spectrometry (FT-IR), 1HNMR, elemental analysis, X-ray diffraction (XRD), thermogravimetric analysis (TGA) and Differential scanning calorimetry (DSC). Antibacterial activity of CECS was evaluated against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) by using minimum inhibition concentration (MIC). The results showed that the prepared CECS soluble in water at wide range of pH values. In a...
Source: International Journal of Biological Macromolecules - Category: Biochemistry Authors: Tags: Int J Biol Macromol Source Type: research
In this study, MBR1 was isolated from a membrane bioreactor used in wastewater treatment plants, and the resistance profile was explored. 5-Nitroindole (5 N)-capped CuO/ZnO bimetal nanoparticles (5 NNP) were synthesized using a one pot method to improve the antibacterial and antibiofilm activities of 5 N against Gram-negative (Escherichia coli ATCC700376 and Pseudomonas aeruginosa PA01) and positive (Staphylococcus aureus ATCC6538) human pathogens. 5 NNP containing 1 mM of 5 N exhibited strong antibacterial and antibiofilm properties to most MDR bacteria. In addition, the photocatalytic activity of CuO/ZnO redu...
Source: Colloids and Surfaces B: Biointerfaces - Category: Biochemistry Source Type: research
In this study, the surface of CT was modified using maleopimaric acid quaternary ammonium cations (MPA-N+) from rosin acid. The surfaces morphology and chemical composition were determined by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS), which confirmed that the MPA-N+ modified CT (CT-g-MPA-N+) was prepared. CT-g-MPA-N+ shows strong and broad spectrum antimicrobial activities against Gram-negative bacteria (Escherichia coli, Pseudomonas aeruginosa) and Gram-positive bacteria (Staphylococcus aureus). It also exhibits prominent durability of antimicrobial capability even after soaking in PBS ...
Source: International Journal of Biological Macromolecules - Category: Biochemistry Authors: Tags: Int J Biol Macromol Source Type: research
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Source: Molecules - Category: Chemistry Authors: Tags: Article Source Type: research
In this study, polyurethane-hyaluronic acid (PU-HA) nanofibrous wound dressing was fabricated and then enriched with three different concentrations of ethanolic extract of propolis (EEP). The obtained samples were characterized by attenuated total reflectance/Fourier transform infrared spectroscopy, thermal gravimetric analysis, scanning electron microscopy, mechanical investigations, antibacterial tests, water uptake exam, and in vitro and in vivo evaluations. The PU-HA/1% EEP and PU-HA/2% EEP samples exhibited higher antibacterial activity against Staphylococcus aureus (2.36 ± 0.33 and 5.63 ± 0.87...
Source: International Journal of Biological Macromolecules - Category: Biochemistry Authors: Tags: Int J Biol Macromol Source Type: research
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