Antibacterial Activity of Surface-Modified Fabric with Ag/AgCl-Doped Quaternary Ammonium-Modified Silicate Hybrid

2019 ◽  
Vol 19 (11) ◽  
pp. 7285-7293 ◽  
Author(s):  
Kuo-Hui Wu ◽  
Yin-Chiung Chang ◽  
Ken-Fa Cheng ◽  
Je-Chuang Wang
Keyword(s):  
Colloidal Suspension ◽  
Sol Gel ◽  
Antimicrobial Properties ◽  
Woven Fabrics ◽  
Dipolar Interactions ◽  
Zone Of Inhibition ◽  
E Coli ◽  
Antibacterial Material ◽  
Surface Modified

An organic–inorganic hybrid antibacterial material based on Ag/AgCl and quaternary ammoniummodified silicate (Ormosil (NR+4 Cl-)) was prepared by sol–gel processes and an in situ reduction method, in which silver nitrate, tetraethoxysilane (TEOS), N-trimethoxysilylpropyl-N,N,Ntrimethylammonium chloride (TMAPS) and N-[3-(trimethoxysilyl)propyl]diethylenetriamine (ATS) acted as precursor, linker and colloidal suspension stabilizer, respectively. The physical properties of the Ormosil (NR+4 Cl-) and Ormosil (NR+4 Cl-)/Ag hybrids were examined using XPS and TGA spectroscopy, the results of which indicated that Ag/AgCl was immobilized in channels by dipolar interactions with the Ormosil (NR+4 Cl-) matrix. Ormosil (NR+4 Cl-) and Ormosil (NR+4 Cl-)/Ag sol solutions were used to functionalize non-woven fabrics by simply immersing the textiles into the dispersions in order to obtain antimicrobial fabrics. The antibacterial effects of the Ormosil/Ag- and Ormosil (NR+4 Cl-)/Ag-modified fabrics against Gram-negative P. aeruginosa and E. coli, and Grampositive S. aureus and B. subtilis, were assessed using the zone of inhibition and the plate-counting method. The antibacterial efficacy was maintained even after 20 laundry cycles. The results indicated that the Ormosil/Ag and Ormosil (NR+4 Cl-)/Ag hybrids are useful as non-leaching agents imparting durable antimicrobial properties to fabrics.

scholarly journals Detection of Ampicillin-Resistant E. coli Using Novel Nanoprobe-Combined Fluorescence In Situ Hybridization

Nanomaterials ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 750 ◽  
Author(s):  
Wang Sik Lee ◽  
Soohyun Lee ◽  
Taejoon Kang ◽  
Choong-Min Ryu ◽  
Jinyoung Jeong
Keyword(s):  
Antibiotic Resistance ◽  
In Situ Hybridization ◽  
Fluorescence In Situ Hybridization ◽  
Antibiotic Resistance Gene ◽  
Sol Gel ◽  
Light Condition ◽  
Resistant Bacteria ◽  
Specific Gene ◽  
E Coli

Antibiotic-resistant bacteria present a global threat because the infections they cause are difficult to treat. Therefore, it is highly important to develop advanced methods for the identification of antibiotic resistance gene in the virulent bacteria. Here, we report the development of novel nanoprobes for fluorescence in situ hybridization (FISH) and the application of the nanoprobe to the detection of ampicillin-resistant Escherichia coli. The nanoprobe for FISH was synthesized by the modified sol–gel chemistry and the synthesized nanoprobe provided strong fluorescent signals and pH stability even under natural light condition. For the double-identification of bacteria species and ampicillin-resistance with a single probe in situ, the nanoprobes were conjugated to the two kinds of biotinylated probe DNAs; one for E. coli-species specific gene and the other for a drug-resistant gene. By using the nanoprobe-DNA conjugants, we successfully detected the ampicillin-resistant E. coli through the FISH technique. This result suggests the new insight into light stable FISH application of the nanoprobe for a pathogenic antibiotic-resistance bacterium.

scholarly journals Development of Sustainable and Functional Fabrics from Recycled and Nanocomposite Polyester Fibers

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Solomon Addis ◽  
Hermela Ejegu ◽  
Messay Dubale ◽  
Wondwossen Mamuye
Keyword(s):  
Antimicrobial Property ◽  
Antimicrobial Properties ◽  
Woven Fabrics ◽  
Bending Rigidity ◽  
Recycled Pet ◽  
E Coli ◽  
Antimicrobial Efficiency ◽  
Yarn Properties ◽  
Polyester Fibers ◽  
Silver Nanocomposite

Antimicrobial knitted and woven fabrics were developed from recycled polyester (PET) and silver nanocomposite (SNC) fibers. Two different fabrics were produced from two different blend proportions of the fibers. The antimicrobial properties of fabrics were tested against those of the S. aureus (Gram-positive) and E. coli (Gram-negative) bacterial natures, and their yarn properties and hand-related characteristics were investigated. The results show uneven fabrics properties such as irregularity in thickness and SNC-recycled PET fiber ratio increase, and the tensile strength decreases while the NEP number increases. This implies that fabrics made from a blend with higher SNC-recycled PET fiber ratios have higher surface roughness levels, higher bending rigidity, and harder texture. As a consequence, the antimicrobial efficiency of the fabrics was improved as the percentage of SNC increased. The recycled PET fiber within the blended yarn shows a good antimicrobial property (above 90%) observed in all fabrics. The reduction of bacterial colonies was constantly exceeding 90% for both E. coli and S. aureus in all fabric samples.

Synthesis and characterization of silver cluster particles in hydrogels

2015 ◽  
Vol 35 (4) ◽  
pp. 303-309
Author(s):  
Aman Deo ◽  
Syed Sauban Ghani
Keyword(s):  
Silver Cluster ◽  
Maximum Size ◽  
Spectrophotometric Analysis ◽  
E Coli ◽  
Hydrogel Network ◽  
Microscopy Analysis ◽  
Antibacterial Material ◽  
Spectroscopy Studies

Abstract A chitosan-based hydrogel network was crosslinked with genipin; the crosslinked and uncrosslinked hydrogels were prepared and studied. Uniformly distributed silver cluster particles (AgCPs) were prepared using these hydrogel networks as a carrier via in situ reduction of silver nitrate (AgNO3) in the presence of sodium borohydride (NaBH4) as a reducing agent; UV irradiation reduction was also done. Fourier transform infrared (FTIR) spectroscopy studies of the hydrogels gave results on the decree of crosslinking and some indication on the presence of the AgCPs. The spectrophotometric analysis indicated the presence of AgCPs, as a peak appeared around 400 nm. The microscopy analysis gave images of the presence of AgCPs and their size; it showed that the crosslinked hydrogels have uniformly distributed AgCPs and as the crosslinking increased, the AgCPs size decreased. The studies on the increasing concentration of AgNO3 solution gave an increase AgCPs size; the maximum size of AgCPs clusters was ∼0.2 micron in uncrosslinked chitosan. It was demonstrated, by using Escherichia coli (E. coli) bacterium, that the AgCPs hydrogel can be effectively employed as antibacterial material.

Immobilization of polyoxometalate on aminosilane-modified silicate: Synthesis, characterization and antibacterial performance

2019 ◽  
Vol 9 (8) ◽  
pp. 970-977
Author(s):  
Kuo-Hui Wu ◽  
Yin-Chiung Chang ◽  
Je-Chuang Wang
Keyword(s):  
Inhibitory Concentration ◽  
Minimum Bactericidal Concentration ◽  
Sol Gel ◽  
Covalent Bond ◽  
Zone Of Inhibition ◽  
Antibacterial Effects ◽  
Antibacterial Performance ◽  
Acidic Conditions ◽  
Better Than

This paper presents studies on the immobilization of the polyoxometalate (H5PV2Mo10O40) on aminosilanemodified silicate as a new barrier of biological toxicant. The polyoxometalate-doped aminosilane-modified silicate (Ormosil/POM hybrid and Ormosil + POM blend) were synthesized by an in situ sol–gel route under acidic conditions. The physical properties of the samples were examined using NMR, SEM, XPS and TGA spectroscopy. The results indicated that POM was immobilized in channels by covalent linkages with the Ormosil of the Ormosil/POM hybrid, and that POM was incorporated into the Ormosil after impregnation from the Ormosil + POM blend. The covalent bond resulted from the reaction of Ormosil with POM, in which Si species were inserted into the vacancy of lacunary POM to form Si–O–Mo bonds. The antibacterial effects of samples were investigated with zone of inhibition testing, the minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC). The Ormosil/POM hybrid and Ormosil + POM blend possessed excellent antibacterial abilities and the antibacterial performance of the Ormosil/POM hybrid was better than that of the Ormosil + POM blend.

Polyamide grafted with polypyrrole: formation, properties, and stability

2013 ◽  
Vol 67 (8) ◽  
Author(s):  
Katarína Mosnáčková ◽  
Mohamed Chehimi ◽  
Pavol Fedorko ◽  
Mária Omastová
Keyword(s):  
Photoelectron Spectroscopy ◽  
Surface Composition ◽  
Sol Gel ◽  
Attenuated Total Reflectance ◽  
Conducting Layer ◽  
Washing Process ◽  
Sol Gel Process ◽  
Pre Treatment ◽  
Surface Modified

AbstractConducting textiles of polyamide (PA) fabrics and polypyrrole (PPy) were prepared by in situ oxidative chemical polymerisation of pyrrole (Py) on the surface of PA textiles using FeCl3 as oxidant. The anionic surfactant, dodecylbenzenesulphonic acid, was used as co-dopant during Py polymerisation on the textile surface. The influence of the monomer amount and polymerisation conditions on formation of the conducting PPy layer, conductivity, morphology, and stability of the prepared PA/PPy was studied. The conductivity of modified textiles decreased rapidly after the washing process, so a special Py-functionalised silane (1-(3-(triethoxysilyl)propylamino)-3-(1-H-pyrrole-1-yl)propan-2-ol; SP) was synthesised and applied to the PA surface prior to PPy formation. The presence of SP on the PA surface after completion of the sol-gel process was verified by Fourier transform infrared spectroscopy with an attenuated total reflectance. Pyrrole polymerisation was subsequently applied to the SP pre-treated textile surface. The influence of SP concentration on both the fastness of the conducting layer after the washing process and stability of the electrical conductivity of the prepared PA/PPy samples was investigated. Surface conductivity of the samples treated and untreated by the sol-gel process of SP was measured both prior to and after washing of the prepared textiles. It was found that an application of 0.6 mass % of SP significantly improved the fastness of the PPy layers. Examination of the modified PA surface using scanning electron microscopy disclosed the differences in the formation of PPy on PA textiles when using SP and also showed differences on the PPy modified textile surface prior to and after washing. The method of X-ray photoelectron spectroscopy was used for a detailed study of the surface composition. It was confirmed that the pre-treatment with Py-functionalised triethoxysilane significantly influenced the chemical composition of the PA surface modified with PPy.

scholarly journals Antimicrobial properties of viscose yarns ring-spun with integrated amino-functionalized nanocellulose

Cellulose ◽  
2021 ◽  
Author(s):  
Vanja Kokol ◽  
Vera Vivod ◽  
Zdenka Peršin ◽  
Miodrag Čolić ◽  
Matjaž Kolar
Keyword(s):  
Skin Irritation ◽  
Cellulose Nanofibrils ◽  
Antimicrobial Properties ◽  
Ionic Surfactant ◽  
E Coli ◽  
Technical Performance ◽  
Durability Testing ◽  
Surface Modified ◽  
The Impact ◽  
Textile Sector

AbstractBio-based, renewable and biodegradable products with multifunctional properties are also becoming basic trends in the textile sector. In this frame, cellulose nanofibrils (CNFs) have been surface modified with hexamethylenediamine/HMDA and used as an antimicrobial additive to a ring-spun viscose yarn. The CNF-HMDA suspension was first characterized in relation to its skin irritation potential, antimicrobial properties, and technical performance (dispersability and suspensability in different media) to optimize its sprayability on a viscose fiber sliver with the lowest sticking, thus to enable its spinning without flowing and tearing problems. The impact of CNF-HMDA content has been examined on the yarn`s fineness, tensile strength, surface chemistry, wettability and antimicrobial properties. The yarn`s antimicrobial properties were increasing with the content of CNF-HMDA, given a 99% reduction for S. aureus and C. albicans (log 1.6–2.1) in up to 3 h of exposure at minimum 33 mg/g, and for E. coli (log 0.69–2.95) at 100 mg/g of its addition, yielding 45–21% of bactericidal efficacy. Such an effect is related to homogeneously distributed CNF-HMDA when sprayed from a fast-evaporated bi-polar medium and using small (0.4 mm) nozzle opennings, thus giving a high positive charge (0.663 mmol/g) without affecting the yarn`s tenacity and fineness, but improving its wettability. However, a non-ionic surfactant being used in the durability testing of functionalized yarn to 10-washing cycles, adheres onto it hydrophobically via the methylene chain of the HMDA, thus blocking its amino groups, and, as such, decreasing its antibacterial efficiency, which was slightly affected in the case when the washing was carried out without using it.

scholarly journals Boron-Doped TiO2-CNT Nanocomposites with Improved Photocatalytic Efficiency toward Photodegradation of Toluene Gas and Photo-Inactivation of Escherichia coli

Catalysts ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 632 ◽  
Author(s):  
Valmiki B. Koli ◽  
Shyue-Chu Ke ◽  
Ananta G. Dodamani ◽  
Shamkumar P. Deshmukh ◽  
Jung-Sik Kim
Keyword(s):  
Tio2 Nanoparticles ◽  
Sol Gel ◽  
Photo Luminescence ◽  
Pure Tio2 ◽  
Electron Hole ◽  
Doped Tio2 ◽  
E Coli ◽  
Boron Doped ◽  
Electron Hole Pair

An in-situ sol-gel method was used for the synthesis of boron-doped TiO2-CNT nanocomposites with varied boron concentrations from 1 to 4 mol%. The synthesized nanocomposites were characterized by various techniques, namely XRD, UV-DRS, TEM, PL, and XPS; all results show that 3 mol% B-TiO2-CNT nanocomposites have superior properties to pure TiO2, 3B-TiO2 nanoparticles, and other nanocomposites. TEM images clearly show the B-TiO2 nanoparticles decorated on the CNT surface. Photo-luminescence studies confirm that boron doping of up to 3 mol% in TiO2-CNT nanocomposites reduces the electron-hole pair recombination rate. The photocatalytic performance of the B-TiO2-CNT nanocomposites was tested against the photodegradation of toluene gas and the photocatalytic inactivation of E. coli in the presence of UV and visible light respectively. B-TiO2-CNT (3 mol%) nanocomposites show the highest photocatalytic activity.

Antibacterial properties of a novel nano-silver loaded poly(styrene-co-acrylic) composites

2021 ◽  
pp. 096739112110374
Author(s):  
Ruge Cao ◽  
Xuqing Zhai ◽  
Xueyang Li ◽  
Xiaoyu Zhao
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Properties ◽  
Underlying Mechanism ◽  
Nano Silver ◽  
E Coli ◽  
Transmission Electron ◽  
Antibacterial Material ◽  
Inhibition Zones ◽  
And Staphylococcus Aureus

To prevent microbial contamination in foods and medical tools, we prepared a novel antibacterial material nano-silver loaded poly(styrene-co-acrylic) (nAg-PSA) composites by in situ reductions. The nAg-PSA was characterized by scanning electron microscope, transmission electron microscopy, energy dispersive X-ray spectroscopy and thermogravimetric analysis. The antibacterial properties of nAg-PSA against Escherichia coli and Staphylococcus aureus were systematically evaluated, and the underlying mechanism was investigated. Results showed that the silver nanoparticles were successfully loaded onto PSA microspheres, highly dispersed on the surface of nAg-PSA nanoparticles. The nAg-PSA nanoparticles all showed significant antibacterial effects, among which nAg-PSA4 had maximum diameters of inhibition zones against the Gram-negative E. coli (1.18 mm) and the Gram-positive S. aureus (1.29 mm), respectively, which closely related to the size and density of silver nanoparticles covered on the surface.

Bi-hybrid coatings: polyaniline-montmorillonite filler in organic-inorganic polymer matrix

2013 ◽  
Vol 67 (8) ◽  
Author(s):  
Milena Špírková ◽  
Patrycja Bober ◽  
Jiří Kotek ◽  
Jaroslav Stejskal
Keyword(s):  
Polymer Matrix ◽  
Propylene Oxide ◽  
Sol Gel ◽  
Reaction System ◽  
Tensile Tests ◽  
Polymeric Matrix ◽  
Inorganic Polymer ◽  
Hybrid Coatings ◽  
Surface Modified

AbstractA bi-hybrid composite is represented by an organic-inorganic (O-I) filler dispersed in an O-I matrix. Polyaniline-montmorillonite, as a nanocomposite filler, was synthesised by two independent processes: (1) montmorillonite was surface-modified with a conducting polymer, polyaniline, during the in-situ oxidation of aniline or (2) montmorillonite was pre-treated with aniline, then the aniline was polymerised and the polyaniline subsequently produced penetrated the montmorillonite structure. The organic-inorganic polymer matrix was formed in two independent steps: (1) inorganic building units were formed in situ by the sol-gel process, (2) followed by organic polymeric matrix formation by polyaddition reactions of epoxy groups with amines. Polyaniline-montmorillonite filler was added to the reaction system between these two steps, i.e. when the inorganic structures of the O-I matrix have already been formed but prior to formation of the organic polymeric matrix. Two different O-I matrices were prepared from functionalised organosilicon precursors and oligomeric amines. 3-[(Glycidyloxy)propyl]trimethoxysilane reacted with α,ω-oligo(propylene oxide) diamine and diethoxy[3-(glycidyloxy)propyl]-methylsilane reacted with α,ω-oligo(propylene oxide) triamine. The resulting bi-hybrid coatings, the O-I filler dispersed in the O-I matrix, were characterised by atomic-force and optical microscopies, and also by tensile tests. The filler composition affected both the mechanical and surface properties of the coatings.

scholarly journals IN SITU GEL POLYMERS: A REVIEW

2021 ◽  
pp. 86-90
Author(s):  
MOUNIKA KONATHAM ◽  
MOUNIKA TEJASWI GORLE ◽  
NAVEEN PATHAKALA ◽  
VASUDHA BAKSHI ◽  
YASO DEEPIKA MAMIDISETTI ◽  
...  
Keyword(s):  
Drug Administration ◽  
Colloidal Suspension ◽  
Sol Gel ◽  
Patient Comfort ◽  
In Situ Gel ◽  
Gel Polymers ◽  
Characteristic Features ◽  
In Situ Gelling ◽  
Gel Transition

In situ gels have become one of the most prominent and accessible systems. These systems have several advantages like simple manufacturing, easy to use, improved adherence, and patient comfort by minimizing drug administration frequency by its unique characteristic features of sol to gel transition. In the 'sol-gel' method, the precursor goes through hydrolysis and polymerization or condensation to produce a colloidal suspension or solution. As they can administer in solution form, these in situ gelling systems undergo gelation at the achievement site. Some researchers recently developed in situ gelling systems of liposomes, microspheres, nanoemulsions, nanospheres, etc. This review mainly focused on the introduction, advantages, disadvantages, types of polymers, and suitable characteristics for preparing in situ gels.

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