scholarly journals Synthesis of Silver Modified Bioactive Glassy Materials with Antibacterial Properties via Facile and Low-Temperature Route

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5115
Author(s):  
Isabel Gonzalo-Juan ◽  
Fangtong Xie ◽  
Malin Becker ◽  
Dilshat U. Tulyaganov ◽  
Emanuel Ionescu ◽  
...  
Keyword(s):  
Surface Modification ◽  
Low Temperature ◽  
Bioactive Glass ◽  
Antibacterial Properties ◽  
Optical Emission ◽  
Infrared Spectrometry ◽  
Ion Release ◽  
E Coli ◽  
Electron Microscopies ◽  
Vis Spectroscopy

There is an increasing clinical need to develop novel biomaterials that combine regenerative and biocidal properties. In this work, we present the preparation of silver/silica-based glassy bioactive (ABG) compositions via a facile, fast (20 h), and low temperature (80 °C) approach and their characterization. The fabrication process included the synthesis of the bioactive glass (BG) particles followed by the surface modification of the bioactive glass with silver nanoparticles. The microstructural features of ABG samples before and after exposure to simulated body fluid (SBF), as well as their ion release behavior during SBF test were evaluated using infrared spectrometry (FTIR), ultraviolet-visible (UV-Vis) spectroscopy, X-ray diffraction (XRD), electron microscopies (TEM and SEM) and optical emission spectroscopy (OES). The antibacterial properties of the experimental compositions were tested against Escherichia coli (E. coli). The results indicated that the prepared ABG materials possess antibacterial activity against E. coli, which is directly correlated with the glass surface modification.

scholarly journals Synthesis of Silver Modified Bioactive Glassy Materials with Antibacterial Properties via Facile and Low-Temperature Route

2020 ◽  
Author(s):  
Isabel Gonzalo-Juan ◽  
Fangtong Xie ◽  
Malin Becker ◽  
Dilshat Tulyaganov ◽  
Emanuel Ionescu ◽  
...  
Keyword(s):  
Surface Modification ◽  
Low Temperature ◽  
Bioactive Glass ◽  
Antibacterial Properties ◽  
Optical Emission ◽  
Infrared Spectrometry ◽  
Ion Release ◽  
E Coli ◽  
Electron Microscopies ◽  
Vis Spectroscopy

There is an increasing clinical need to develop novel biomaterials that combine regenerative and biocidal properties. In this work, we present the preparation of silver /silica based glassy bioactive (ABG) compositions via a facile, fast (20h), and low temperature (80 °C) approach and their characterization. The fabrication process included the synthesis of the bioactive glass (BG) particles followed by the surface modification of the bioactive glass with silver nanoparticles. The microstructural features of ABG samples before and after exposure to simulated body fluid (SBF) as well as their ion release behavior during SBF test were evaluated using infrared spectrometry (FTIR), ultraviolet- visible (UV-Vis) spectroscopy, X-ray diffraction (XRD), electron microscopies (TEM and SEM) and optical emission spectroscopy (OES). The antibacterial properties of the experimental compositions were tested against Escherichia coli (E. coli). The results indicated that the prepared ABG materials possess antibacterial activity against E. coli, which is directly correlated with the glass surface modification.

scholarly journals Bacteriostatic Activity of LLDPE Nanocomposite Embedded with Sol–Gel Synthesized TiO2/ZnO Coupled Oxides at Various Ratios

Polymers ◽  
2018 ◽  
Vol 10 (8) ◽  
pp. 878 ◽  
Author(s):  
Khairul Saharudin ◽  
Srimala Sreekantan ◽  
Norfatehah Basiron ◽  
Yong Khor ◽  
Nor Harun ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Structural Characteristics ◽  
Sol Gel ◽  
Antibacterial Properties ◽  
Polymer Nanocomposite ◽  
Zinc Ion ◽  
Active Species ◽  
Ion Release ◽  
E Coli ◽  
Bactericidal Effects

Metal oxide-polymer nanocomposite has been proven to have selective bactericidal effects against the main and common pathogens (Gram-positive Staphylococcus aureus (S. aureus) and Gram-negative Escherichia coli (E. coli)) that can cause harmful infectious diseases. As such, this study looked into the prospect of using TiO2/ZnO with linear low-density polyethylene (LLDPE) to inactivate S. aureus and E. coli. The physical, structural, chemical, mechanical, and antibacterial properties of the nanocomposite were investigated in detail in this paper. The production of reactive species, such as hydroxyl radicals (•OH), holes (h+), superoxide anion radicals (O2•¯), and zinc ion (Zn2+), released from the nanocomposite were quantified to elucidate the underlying antibacterial mechanisms. LLDPE/25T75Z with TiO2/ZnO (1:3) nanocomposite displayed the best performance that inactivated S. aureus and E. coli by 95% and 100%, respectively. The dominant reactive active species and the zinc ion release toward the superior antibacterial effect of nanocomposite are discussed. This work does not only offer depiction of the effective element required for antimicrobial biomedical appliances, but also the essential structural characteristics to enhance water uptake to expedite photocatalytic activity of LLDPE/metal oxide nanocomposite for long term application.

Antibacterial Activity of a Chitosan Derivative Obtained in the Absence of a Solvent

2016 ◽  
Vol 869 ◽  
pp. 869-873 ◽  
Author(s):  
Luizângela Reis Osório ◽  
Idglan Sá Lima ◽  
Humberto Medeiros Barreto ◽  
Josy Anteveli Osajima ◽  
Edson Cavalcanti Silva Filho
Keyword(s):  
Antibacterial Activity ◽  
Chemical Change ◽  
Antibacterial Properties ◽  
Infrared Spectrometry ◽  
Contact Method ◽  
Direct Reaction ◽  
Chitosan Derivative ◽  
E Coli ◽  
Resistant Strains ◽  
Drug Resistant Strains

A novel chitosan derivative was prepared through direct reaction of pure chitosan with acetylacetone in the absence of a solvent, and it was characterized by elemental analysis, Fourier transform infrared spectrometry (FTIR), and 13C Nuclear Magnetic Ressonance (NMR) spectroscopy. Moreover, the antibacterial properties of the new biomaterial were tested by the direct contact method against multi-drug resistant strains of Staphylococcus aureus and Escherichia coli. The results from the characterization were consistent with the modification of the chemical structure made. The new derivative showed a better antibacterial activity than raw chitosan against E. coli strains, indicating that incorporation of imine link (Schiff base) enhanced its antibacterial activity against Gram-negative bacterium. On the contrary, this chemical change did not decrease its antibacterial activity against Gram-positive bacterium.

scholarly journals One Pot Synthesis of Ternary MWCNTs/ZnO/Chitosan Nanocomposite for Enhanced Photocatalytic Degradation of Organic Dyes and Antibacterial Activity

2021 ◽  
Author(s):  
Mitra Malekkiani ◽  
Abbas Heshmati Jannat Magham ◽  
Fateme Ravari ◽  
Mehdi Dadmehr
Keyword(s):  
Antibacterial Activity ◽  
Organic Dyes ◽  
Antibacterial Properties ◽  
Photogenerated Electron ◽  
Spatial Separation ◽  
Electron Hole ◽  
One Pot ◽  
E Coli ◽  
Ternary Nanocomposite ◽  
Vis Spectroscopy

Abstract Developing a cheap, stable and effective photocatalyst is necessary for remediation of persistent organic pollutants. To address this challenge, we proposed a unique interfacial engineering technique and proper bandgap matching strategy to synthesize MWCNTs/ZnO/Chitosan ternary nanocomposite for effective photocatalytic application. The features of the prepared samples were determined by FESEM, TEM, EDX, elemental mapping, AFM, FT-IR, XRD, UV-Vis spectroscopy and BET surface analysis. The obtained results showed successful fabrication of synthesized nanocomposites. Degradation effect of nanostructures on methylene blue (MB) and antibacterial activity against Escherichia coli (E. coli), Staphylococcus aureus (S. aureus) and Bacillus subtilis (B. subtilis) pathogenic strains were investigated. The proposed photocatalytic mechanism illustrated the electron transfer facilitated by MWCNTs/ZnO/Chitosan structure which results in spatial separation of electron-hole pairs. Compared with ZnO and ZnO/Chitosan, the prepared MWCNTs/ZnO/Chitosan ternary nanocomposite showed high usage of UV illumination and superior separation of photogenerated electron-hole pairs. MWCNTs/ZnO/Chitosan illustrated outstanding increased photocatalytic activity on MB degradation efficiency of 98.76% after 20 mins. In addition, the ternary nanocomposite also exhibited remarkable bactericidal activity against gram-positive (S. aureus) and (B. subtilis) and gram-negative (E. coli) bacteria strains. Due to the obtained results, the prepared nanocomposite would be an efficient candidate photocatalyst with antibacterial properties.

Controlling ion release from bioactive glass foam scaffolds with antibacterial properties

2006 ◽  
Vol 17 (11) ◽  
pp. 989-996 ◽  
Author(s):  
Julian R. Jones ◽  
Lisa M. Ehrenfried ◽  
Priya Saravanapavan ◽  
Larry L. Hench
Keyword(s):  
Bioactive Glass ◽  
Antibacterial Properties ◽  
Ion Release ◽  
Glass Foam

scholarly journals Studies on Biosynthesis of Silver Nanoparticles Using Rhizopus sp. and its Antibacterial Efficacy on E. coli MDR Strains

2014 ◽  
Vol 23 ◽  
pp. 27-35
Author(s):  
Jyothi Hiremath ◽  
Vandana Rathod ◽  
Shivaraj Ninganagouda ◽  
Dattu Singh ◽  
K. Prema
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Human Life ◽  
Antibacterial Properties ◽  
Pharmaceutical Products ◽  
Diffusion Method ◽  
Plasmon Resonance Peak ◽  
Synthesis Of Nanoparticles ◽  
E Coli ◽  
Vis Spectroscopy

Nanotechnology is a field that is burgeoning day by day, making an impact in all spheres of human life. Biological methods of synthesis have paved way for the “greener synthesis” of nanoparticles and these have proven to be better methods due to slower kinetics, they offer better manipulation and control over crystal growth and their stabilization. In this context we have investigated extracellular biosynthesis of silver nanoparticles (AgNPs) using cell-free extract of Rhizopus spp.. Formation of AgNPs was indicated by the change in the colour of the cellfree extract from yellow to dark brown under static condition after 48 hrs of incubation. Characterization of AgNPs was carried out by UV-Vis Spectroscopy which gave sharp plasmon resonance peak at 429 nm corresponding to spherical shaped nanoparticles. Transmission electron microscopy (TEM) micrograph showed formation of well-dispersed AgNPs in the range of 25-50 nm. Scanning electron microscopy (SEM) showed the particles to be uniformly dispersed without agglomeration with smooth morphology. EDS showed the presence of elemental silver at 3kev. X-ray diffraction (XRD)-spectrum of the AgNPs exhibited 2θ¸ values corresponding to nanocrystal. These biosynthesized AgNPs were used to study their antimicrobial activity against Multi-drug resistant (MDR) E. coli strains, by Agar diffusion method. Zone of inhibition was measured. Synthesis of nanosized particles with antibacterial properties, which are called "nanoantibiotics", is of great interest in the development of new pharmaceutical products.

Seed-mediated synthesis and PEG coating of gold nanoparticles for controlling morphology and sizes

MRS Advances ◽  
2020 ◽  
Vol 5 (63) ◽  
pp. 3353-3360
Author(s):  
Susana Helena Arellano Ramírez ◽  
Perla García Casillas ◽  
Christian Chapa González
Keyword(s):  
Gold Nanoparticles ◽  
Polyethylene Glycol ◽  
Room Temperature ◽  
Colloidal Stability ◽  
Infrared Spectrometry ◽  
Ammonium Bromide ◽  
Chloroauric Acid ◽  
Vis Spectroscopy ◽  
Seed Mediated ◽  
Peg Coating

AbstractA significant area of research is biomedical applications of nanoparticles which involves efforts to control the physicochemical properties through simple and scalable processes. Gold nanoparticles have received considerable attention due to their unique properties that they exhibit based on their morphology. Gold nanospheres (AuNSs) and nanorods (AuNRs) were prepared with a seed-mediated method followed of polyethylene glycol (PEG)-coating. The seeds were prepared with 0.1 M cetyltrimethyl-ammonium bromide (CTAB), 0.005 M chloroauric acid (HAuCl4), and 0.01 M sodium borohydride (NaBH4) solution. Gold nanoparticles with spherical morphology was achieved by growth by aggregation at room temperature, while to achieve the rod morphology 0.1 M silver nitrate (AgNO3) and 0.1 M ascorbic acid solution were added. The gold nanoparticles obtained by the seed-mediated synthesis have spherical or rod shapes, depending on the experimental conditions, and a uniform particle size. Surface functionalization was developed using polyethylene glycol. Morphology, and size distribution of AuNPs were evaluated by Field Emission Scanning Electron Microscopy. The average size of AuNSs, and AuNRs was 7.85nm and 7.96 x 31.47nm respectively. Fourier transform infrared spectrometry was performed to corroborate the presence of PEG in the AuNPs surface. Additionally, suspensions of AuNSs and AuNRs were evaluated by UV-Vis spectroscopy. Gold nanoparticles were stored for several days at room temperature and it was observed that the colloidal stability increased once gold nanoparticles were coated with PEG due to the shield formed in the surface of the NPs and the increase in size which were 9.65±1.90 nm of diameter for AuNSs and for AuNRs were 29.03±5.88 and 8.39±1.02 nm for length and transverse axis, respectively.

Surface Modification of Apatite-wollastonite Bioactive Glass-ceramic by Grafting with RGD Peptides

2013 ◽  
Vol 28 (10) ◽  
pp. 1137-1142
Author(s):  
Xiang ZHANG ◽  
Da-Li ZHOU ◽  
Qin LONG ◽  
Jia-Bei ZHOU ◽  
Yan-Fei TAN ◽  
...  
Keyword(s):  
Surface Modification ◽  
Bioactive Glass ◽  
Glass Ceramic ◽  
Rgd Peptides

Surface Modification of Cobalt‐Manganese Mixed Oxide and Its Application for Low‐Temperature Propane Catalytic Combustion

2021 ◽  
Vol 6 (4) ◽  
pp. 522-531
Author(s):  
Yihao Liu ◽  
Peng Zhao ◽  
Liang Sun ◽  
Nengjie Feng ◽  
Lei Wang ◽  
...  
Keyword(s):  
Surface Modification ◽  
Low Temperature ◽  
Mixed Oxide ◽  
Catalytic Combustion

scholarly journals Green Synthesis and Incorporation of Sericin Silver Nanoclusters into Electrospun Ultrafine Cellulose Acetate Fibers for Anti-Bacterial Applications

Polymers ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1411
Author(s):  
Mujahid Mehdi ◽  
Huihui Qiu ◽  
Bing Dai ◽  
Raja Fahad Qureshi ◽  
Sadam Hussain ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Green Synthesis ◽  
Cellulose Acetate ◽  
Antibacterial Properties ◽  
Vital Role ◽  
Silver Nanoclusters ◽  
Composite Fibers ◽  
E Coli ◽  
Antibacterial Performance ◽  
Field Emission Electron Microscopy

Fiber based antibacterial materials have gained an enormous attraction for the researchers in these days. In this study, a novel Sericin Encapsulated Silver Nanoclusters (sericin-AgNCs) were synthesized through single pot and green synthesis route. Subsequently these sericin-AgNCs were incorporated into ultrafine electrospun cellulose acetate (CA) fibers for assessing the antibacterial performance. The physicochemical properties of sericin-AgNCs/CA composite fibers were investigated by transmission electron microscopy (TEM), field emission electron microscopy (FE-SEM), Fourier transform infrared spectroscopy (FTIR) and wide X-ray diffraction (XRD). The antibacterial properties of sericin-AgNCs/CA composite fibers against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) were systematically evaluated. The results showed that sericin-AgNCs incorporated in ultrafine CA fibers have played a vital role for antibacterial activity. An amount of 0.17 mg/mL sericin-AgNCs to CA fibers showed more than 90% results and elevated upto >99.9% with 1.7 mg/mL of sericin-AgNCs against E. coli. The study indicated that sericin-AgNCs/CA composite confirms an enhanced antibacterial efficiency, which could be used as a promising antibacterial product.

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