Apatite-coated Ag/AgBr/TiO2 nanocomposites: Insights into the antimicrobial mechanism in the dark and under visible-light irradiation

Mohaghegh, Neda; Endo‐Kimura, Maya; Wang, Kunlei; Wei, Zhishun; Najafabadi, Alireza Hassani; Zehtabi, Fatemeh; Kouchehbaghi, Negar Hosseinzadeh; Sharma, Saurabh; Markowska‐Szczupak, Agata; Kowalska, Ewa

doi:10.1016/j.apsusc.2023.156574

Cited by 26 publications

(9 citation statements)

References 65 publications

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“…AgNW is reported as a broad‐spectrum anti‐infective material in the literature. [ 15 , 16 , 25 ] To evaluate the anti‐infective property of the AgNW‐SF theranostic devices, the two most prevalent sources of bacterial infection after surgery, Staphylococcus aureus ( S. aureus , Gram‐positive) and Escherichia coli ( E. coli , Gram‐negative), [ 26 ] were subjected to the hydrated device (with SF concentration of 4% w/v). Before the bacterial culture, all the AgNW‐SF devices were sterilized under UV light for ≈1 h and soaked in sterile Milli‐Q water for one week to allow for the possible release of Ag + ions.…”

Section: Resultsmentioning

confidence: 99%

“…In agreement with our findings, Kim et al also reported stronger antibacterial efficacy of electron beam irradiated AgNW against E. coli than S. aureus . [ 15a ] The possible reason for the observed stronger anti‐infective effect of AgNW against E. coli could be attributed to the different cell wall structure of the Gram‐negative ( E. coli ) and Gram‐positive ( S. aureus ) bacteria, allowing different interactions between the AgNW and the cell wall. [ 27 ] Although the exact anti‐infective mechanism of AgNW is not known, the release of the Ag + ions from the oxidized Ag might be a possible reason.…”

Section: Resultsmentioning

confidence: 99%

“…[ 27 ] Although the exact anti‐infective mechanism of AgNW is not known, the release of the Ag + ions from the oxidized Ag might be a possible reason. [ 15a ]…”

Section: Resultsmentioning

confidence: 99%

“…[ 14 ] Silver materials in the nanoscale have great antibacterial properties, mainly by releasing silver ions (Ag + ) from their surfaces to combine with the negatively charged bacteria membranes to interrupt normal bacteria functions or catalyze the production of reactive oxygen species to interfere with enzymes and DNA functions. [ 15 ] We have previously synthesized AgNWs offering antibacterial properties. [ 16 ] Integrating AgNW and SF can provide synergistic antibacterial and hemostatic properties to the device.…”

Section: Introductionmentioning

confidence: 99%

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An All‐In‐One Transient Theranostic Platform for Intelligent Management of Hemorrhage

et al. 2023

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Developing theranostic devices to detect bleeding and effectively control hemorrhage in the prehospital setting is an unmet medical need. Herein, an all‐in‐one theranostic platform is presented, which is constructed by sandwiching silk fibroin (SF) between two silver nanowire (AgNW) based conductive electrodes to non‐enzymatically diagnose local bleeding and stop the hemorrhage at the wound site. Taking advantage of the hemostatic property of natural SF, the device is composed of a shape‐memory SF sponge, facilitating blood clotting, with ≈82% reduction in hemostatic time in vitro as compared with untreated blood. Furthermore, this sandwiched platform serves as a capacitive sensor that can detect bleeding and differentiate between blood and other body fluids (i.e., serum and water) via capacitance change. In addition, the AgNW electrode endows anti‐infection efficiency against Escherichia coli and Staphylococcus aureus. Also, the device shows excellent biocompatibility and gradually biodegrades in vivo with no major local or systemic inflammatory responses. More importantly, the theranostic platform presents considerable hemostatic efficacy comparable with a commercial hemostat, Dengen, in rat liver bleeding models. The theranostic platform provides an unexplored strategy for the intelligent management of hemorrhage, with the potential to significantly improve patients' well‐being through the integration of diagnostic and therapeutic capabilities.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…[ 27 ] Although the exact anti‐infective mechanism of AgNW is not known, the release of the Ag + ions from the oxidized Ag might be a possible reason. [ 15a ]…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An All‐In‐One Transient Theranostic Platform for Intelligent Management of Hemorrhage

et al. 2023

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“…According to existing theories [69][70][71], Ag ions can destabilize the cell membrane, even creating holes through which they penetrate into the cell. They interact with the thiol (-SH) groups of proteins and enzymes.…”

Section: Antimicrobial Propertiesmentioning

confidence: 99%

Hybrid Materials Obtained by Immobilization of Biosynthesized Ag Nanoparticles with Antioxidant and Antimicrobial Activity

Petcu,

Ciobanu,

Paun

et al. 2024

IJMS

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Ag nanoparticles (AgNPs) were biosynthesized using sage (Salvia officinalis L.) extract. The obtained nanoparticles were supported on SBA-15 mesoporous silica (S), before and after immobilization of 10% TiO2 (Degussa-P25, STp; commercial rutile, STr; and silica synthesized from Ti butoxide, STb). The formation of AgNPs was confirmed by X-ray diffraction. The plasmon resonance effect, evidenced by UV-Vis spectra, was preserved after immobilization only for the sample supported on STb. The immobilization and dispersion properties of AgNPs on supports were evidenced by TEM microscopy, energy-dispersive X-rays, dynamic light scattering, photoluminescence and FT-IR spectroscopy. The antioxidant activity of the supported samples significantly exceeded that of the sage extract or AgNPs. Antimicrobial tests were carried out, in conditions of darkness and white light, on Staphylococcus aureus, Pseudomonas aeruginosa, Escherichia coli and Candida albicans. Higher antimicrobial activity was evident for SAg and STbAg samples. White light increased antibacterial activity in the case of Escherichia coli (E. coli) and Pseudomonas aeruginosa (P. aeruginosa). In the first case, antibacterial activity increased for both supported and unsupported AgNPs, while in the second one, the activity increased only for SAg and STbAg samples. The proposed antibacterial mechanism shows the effect of AgNPs and Ag+ ions on bacteria in dark and light conditions.

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Antibacterial performance of Co–Zn ferrite nanoparticles under visible light irradiation

Gubieda,

Abad‐Díaz‐de‐Cerio,

García‐Prieto

et al. 2024

J of Chemical Tech & Biotech

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BACKGROUNDTo address water scarcity and promote sustainable resource management, more efficient and cost‐effective water treatment solutions are necessary. Particularly, pathogens in drinking water are a topic of growing concern. One promising technology is the use of photocatalytic nanoparticles activated by visible light as antibacterial agents. This study focuses on the characterization and antibacterial properties of Co–Zn ferrite nanocatalysts, tested against Escherichia coli.RESULTSThe CoxZn1−xFe2O4 (x = 0, 0.1, 0.4 and 0.6) ferrites were synthesized by the co‐precipitation method. Structural, morphological and optical analyses confirmed that these nanoparticles have a cubic spinel structure, with sizes of around 10 nm, and band gap energies suitable for visible light activation (1.4–1.7 eV). The antibacterial efficacy of the nanoparticles against E. coli was tested and compared with their photocatalytic performance employing phenol as organic pollutant model (highest phenol degradation for x = 0.6). Specifically, the antibacterial capacity of these nanoparticles was evaluated by comparing the ability of bacteria to grow after being incubated with the nanoparticles under visible light and in the dark. It was found that nanoparticles with lower cobalt content (x = 0 and 0.1) significantly reduced bacterial culturability under visible light. Transmission Electron Microscopy analysis revealed that nanoparticles with cobalt content caused bacteria to secrete biofilm, potentially offering some protection against the nanoparticles.CONCLUSIONZnFe2O4 nanoparticles show the highest antibacterial effect amongst those tested. This is attributed to the combined action of Zn2+ ion release and the photocatalytic effect under visible light. Furthermore, Zn might inhibit protective biofilm secretion, leading to higher antibacterial effects. © 2024 The Author(s). Journal of Chemical Technology and Biotechnology published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry (SCI).

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Apatite-coated Ag/AgBr/TiO2 nanocomposites: Insights into the antimicrobial mechanism in the dark and under visible-light irradiation

Cited by 26 publications

References 65 publications

An All‐In‐One Transient Theranostic Platform for Intelligent Management of Hemorrhage

An All‐In‐One Transient Theranostic Platform for Intelligent Management of Hemorrhage

Hybrid Materials Obtained by Immobilization of Biosynthesized Ag Nanoparticles with Antioxidant and Antimicrobial Activity

Antibacterial performance of Co–Zn ferrite nanoparticles under visible light irradiation

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