β-Ag2MoO4 microcrystals: Characterization, antibacterial properties and modulation analysis of antibiotic activity

Moura, João Victor Barbosa; Freitas, Thiago Sampaio de; Cruz, Rafael Pereira da; Pereira, Raimundo Luiz Silva; Silva, A.R.P.; Santos, Antônia Thassya Lucas dos; Silva, J.H. da; Luz-Lima, C.; Freire, Paulo; Coutinho, Henrique Douglas Melo

doi:10.1016/j.biopha.2016.12.016

Cited by 41 publications

(10 citation statements)

References 45 publications

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“…Against Gram-positive S. aureus 10, the compound achieved a two-fold MIC reduction for norfloxacin and gentamicin, while no significant effect was observed with imipenem. e same synergistic behavior was reported to β-Ag 2 MoO 4 microcrystals for the same antibiotics against S. aureus [44]. Meanwhile, for Gram-negative P. aeruginosa 15, only gentamicin had a synergistic effect with Na-TiNT; there was a reduction in MIC from 16 mg/mL to 3.17 mg/ mL.…”

Section: Antibacterial Activity and Modulation Of Antibioticsupporting

confidence: 67%

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Na‐TiNT Nanocrystals: Synthesis, Characterization, and Antibacterial Properties

Agressott

Oliveira

Freitas

et al. 2022

Bioinorganic Chemistry and Applications

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Titanium nanotubes have attractive morphological and physicochemical properties for several applications, such as high surface area, mesoporous structure, good stability, ion exchange capacity, and antibacterial property. Therefore, the field of nanotube applications is increasingly expanding, such as in solar cells sensitized by dye, photocatalysis, and antibacterial activity, among others. Therefore, a study of the antibacterial properties of sodium titanate nanotubes (Na-TiNTs) was carried out together with physicochemical characterizations, such as Raman spectroscopy which shows a peak characteristic of Na-O-Ti from nanotube-agglomerated regions. The XRD diffractogram confirmed the Raman spectra and evidenced the crystalline structure associated to Na-TiNT, which showed the characteristic peaks of the sodium trititanate crystal. SEM and TEM images showed the morphology of hollow nanotubes and forming semispherical particles. EDS shows the percentage values of each of the compounds in the Na-TiNT. The bacterial activity of the Na-TiNT was analyzed in Escherichia coli, Staphylococcus aureus, and Pseudomonas aeruginosa. Na-TiNT modified the activity of the gentamicin and norfloxacin antibiotics against multiresistant strains. Synergistic effects against Gram-positive S. aureus 10 and Gram-negative P. aeruginosa 15 bacteria were observed when the Na-TiNT was associated with gentamicin, reducing the concentration of this antibiotic that is required to inhibit bacterial growth. Another synergic effect was observed for S. aureus 10 with norfloxacin.

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Section: Antibacterial Activity and Modulation Of Antibioticsupporting

confidence: 67%

“…A weak synergism of imipenem against E. coli 06 has been observed. e way Gram-negative develop resistance to this type of drug is mainly by enzymatic hydrolysis [44,45].…”

Section: Antibacterial Activity and Modulation Of Antibioticmentioning

confidence: 99%

Na‐TiNT Nanocrystals: Synthesis, Characterization, and Antibacterial Properties

Agressott

Oliveira

Freitas

et al. 2022

Bioinorganic Chemistry and Applications

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“…The antibacterial activity demonstrated by silver trimolybdate dihydrate is corroborated by previous studies demonstrating a significant action of β -Ag 2 MoO 4 crystals against E. coli [ 16 ]. In addition, different compounds obtained as silver molybdate crystals have demonstrated significant activities against both Gram-positive and Gram-negative bacteria [ 15 ], as well as against fungal strains [ 23 ]. However, the mechanisms of action underlying the antibacterial effects of crystals containing silver atoms remain to be fully characterised.…”

Section: Resultsmentioning

confidence: 99%

“…erefore, considering the evidence that silver molybdates could modulate bacterial resistance [14][15][16], this study aims to investigate the antibacterial, antibiotic-enhancing, and photocatalytic activities of silver trimolybdate dihydrate (Ag 2 Mo 3 O 10 .2H 2 O) nanorods against resistant strains of Staphylococcus aureus and Escherichia coli in association with visible LED lights. 2H 2 O) nanorods were synthesised using a simple hydrothermal method, as described previously [17].…”

Section: Introductionmentioning

confidence: 99%

[Retracted] Silver Trimolybdate (Ag2Mo3O10.2H2O) Nanorods: Synthesis, Characterization, and Photo‐Induced Antibacterial Activity under Visible‐Light Irradiation

Leandro

Moura

Araújo

et al. 2022

Bioinorganic Chemistry and Applications

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The present study reports the synthesis, characterization, and antibacterial properties of silver trimolybdate (Ag2Mo3O10.2H2O) nanorods. The synthesis was performed using a conventional hydrothermal method. The sample was characterised by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, UV–Vis–NIR diffuse reflectance, thermogravimetric analysis (TGA), and differential scanning calorimeter (DSC). The direct antibacterial activity was evaluated using the microdilution method to determine the minimum inhibitory concentration (MIC). To assess the ability of Ag2Mo3O10.2H2O nanorods to modulate antibacterial resistance, the MIC of aminoglycosides was established in the presence of a subinhibitory concentration of this substance alone and associated with LED light exposure. The characterization of the sample indicated that the synthesis of silver trimolybdate generated nanometric crystals with rod-like morphology, without secondary phases. The treatment with Ag2Mo3O10.2H2O nanorods alone or combined with visible LED lights exhibited clinically relevant antibacterial activity against both Gram-negative and Gram-positive bacteria. This nanostructure presented a variable antibiotic-modulating action, which was not improved by visible LED light exposure. Nevertheless, LED lights showed promising antibiotic-enhancing activities in the absence of Ag2Mo3O10.2H2O nanorods. In conclusion, silver trimolybdate dihydrate nanorods have antibacterial properties that can be photocatalysed by visible-light exposure. While showing the potential use to combat antibacterial resistance, the simultaneous combination of silver trimolybdate, visible LED lights, and antibacterial drugs should be carefully analysed to avoid antagonist effects that could impair the effectiveness of antibiotic therapy.

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“…The sum of all these effects causes the death of the bacteria and can involve the following step: the contact between the bacterial cell and the exposed surfaces of AWO can enhance changes in the microenvironment within the area of contact between the microorganism and the particle. The ROS thus formed exhibit high oxidative potential to react with the carbon chains present in the bacterial wall, resulting in the breakdown of the chains of the lipid compounds, proteins, etc [3,13,25,63]. Hence, it is hypothesized that the increased ROS may further trigger catalyzing oxidation reactions [64], and the exposed surfaces of AWO produce a stronger interaction with the bacterial cells to react with the carbonic chains, and cause destabilization of the phospholipid bilayer of the cell and degradation of cytosolic proteins (i.e.…”

Section: Antibacterial and Photocatalytic Activitymentioning

confidence: 99%

Surface-dependent properties of α-Ag2WO4: a joint experimental and theoretical investigation

et al. 2020

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α-Ag 2 WO 4 has attracted much attention in recent years due to its unique crystal and electronic structures, which are suitable for a wide range of applications. This work presents a more realistic study, based on first-principles calculations and experimental results, of the potential of α-Ag 2 WO 4 for antibacterial and photocatalytic activity. α-Ag 2 WO 4 material has been successfully synthesized by a coprecipitation method and subjected to microwave irradiation for different times. The as-synthesized microcrystals were structurally characterized by X-ray diffraction, while the morphological aspects were investigated by field emission scanning electron microscopy. The experimental studies and theoretical simulations of α-Ag 2 WO 4 , based on density functional theory calculations, have highlighted several key parameters (surface-dependent) that determine the antibacterial (against Staphylococcus aureus ) and photocatalytic activity (for the degradation of Rhodamine B), and provided some general principles for materials design. We believe that our results offer new insights regarding the local coordination of superficial Ag and W cations (i.e. clusters) on each exposed surface of the corresponding morphology, that dictate the antibacterial and photocatalytic activities of α-Ag 2 WO 4 , a field that has so far remained unexplored. Response to Reviewers:Manuscript ID: TCAC-D-20-00072 Response to reviewersWe acknowledge the Reviewers for their help in improving our manuscript. As can be seen in the revised text, these comments, remarks and suggestions were considered during our revision. Detailed responses, point-by-point, to the reviewers are summarized below and the changes were made along the revised version of the manuscript and were highlighted in red color.

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β-Ag2MoO4 microcrystals: Characterization, antibacterial properties and modulation analysis of antibiotic activity

Cited by 41 publications

References 45 publications

Na‐TiNT Nanocrystals: Synthesis, Characterization, and Antibacterial Properties

Na‐TiNT Nanocrystals: Synthesis, Characterization, and Antibacterial Properties

[Retracted] Silver Trimolybdate (Ag2Mo3O10.2H2O) Nanorods: Synthesis, Characterization, and Photo‐Induced Antibacterial Activity under Visible‐Light Irradiation

Surface-dependent properties of α-Ag2WO4: a joint experimental and theoretical investigation

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