Synthesis, characterization of silver/kaolinite nanocomposite and studying its antibacterial activity

Bekissanova, Zhanar; Railean-Plugaru, Viorica; Brzozowska, Weronika; Wojtczak, Izabela; Ospanova, Aliya; Buszewski, Bogusław; Sprynskyy, Myroslav

doi:10.1016/j.colsurfb.2022.112908

Cited by 11 publications

(6 citation statements)

References 86 publications

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“…This phenomenon can be explained by the synergistic effect generated by both silver and oxide titanium in the context of photoluminescent activity. Moreover, in the case of silver kaolinite nanocomposites [ 82 ], the antimicrobial potential appears to be dependent on the concentration, while in the case of silver TiO 2 /DBP, it does not.…”

Section: Resultsmentioning

confidence: 99%

Pyrolized Diatomaceous Biomass Doped with Epitaxially Growing Hybrid Ag/TiO2 Nanoparticles: Synthesis, Characterisation and Antibacterial Application

et al. 2023

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In the pursuit of innovative solutions for modern technologies, particularly in the design and production of new micro/nanostructured materials, microorganisms acting as “natural microtechnologists” can serve as a valuable source of inspiration. This research focuses on harnessing the capabilities of unicellular algae (diatoms) to synthesize hybrid composites composed of AgNPs/TiO2NPs/pyrolyzed diatomaceous biomass (AgNPs/TiO2NPs/DBP). The composites were consistently fabricated through metabolic (biosynthesis) doping of diatom cells with titanium, pyrolysis of the doped diatomaceous biomass, and chemical doping of the pyrolyzed biomass with silver. To characterize the synthesized composites, their elemental and mineral composition, structure, morphology, and photoluminescent properties were analysed using techniques such as X-ray diffraction, scanning and transmission electron microscopy, and fluorescence spectroscopy. The study revealed the epitaxial growth of Ag/TiO2 nanoparticles on the surface of pyrolyzed diatom cells. The antimicrobial potential of the synthesized composites was evaluated using the minimum inhibitory concentration (MIC) method against prevalent drug-resistant microorganisms, including Staphylococcus aureus, Klebsiella pneumonia, and Escherichia coli, both from laboratory cultures and clinical isolates.

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Section: Resultsmentioning

confidence: 99%

Pyrolized Diatomaceous Biomass Doped with Epitaxially Growing Hybrid Ag/TiO2 Nanoparticles: Synthesis, Characterisation and Antibacterial Application

et al. 2023

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“…Many research studies demonstrated the antimicrobial activity, synergistic effect of silver formulations against clinical isolates and its application in pharmacology and cosmetology [44][45][46]. In another trend of thoughts, our previous studies [43,47] show dissimilarity in the antimicrobial activity of AgNPs/kaolinite and AgNPs/TiO 2 /DBP nanocomposites that used additional support for the synthesis. Additionally, the support influences the antimicrobial effect, the metal (element) used, and the synthesis method; the TiO 2 /DBP nanocomposites display higher antimicrobial potential against the same bacterial strains than AgNPs/ kaolinite.…”

Section: Introductionmentioning

confidence: 94%

“…The higher zeta potential values for the 4.70%Ag/6.31%Ce/DBioSiO 2 composite, relative to 2.26%Ag/2.52%Ce/DBioSiO 2 , may be related to the fact that the silver nanoparticles are smaller in size as the pH value increases [57]. It is, therefore, essential to note that the surface of the nanoparticles was negatively charged, favouring their mutual repulsion and thus reducing the possibility of aggregate formation [47]. This effect could be compensated for by the positively charged surface of the cerium (IV) oxide nanoparticles present in the composite [58].…”

Section: Zeta Potential Measurements Of the Obtained Compositesmentioning

confidence: 99%

Diatomaceous Biosilica Doped with Heteroepitaxially Growing Ag/AgCl/CeO2 Composite Nanoparticles: Synthesis, Characterisation and Antibacterial Application

Wojtczak,

Brzozowska,

Railean

et al. 2023

J Clust Sci

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Modern technology's development is also towards using microorganisms as micro-factories of biomaterials with unique properties and combining the original properties of biosilica extracted from diatoms (microalgae) together with immobilised silver and cerium in nanoparticle forms allowed to obtain a modern composite material with antibacterial activity. The synthesised composites containing heteroepitaxially growing Ag/AgCl/CeO2 complex nanoparticles were studied using different types of instrumental analysis. SEM-EDX and XRD analysis allowed the qualitative and quantitative determination of the elements present and their forms in the composites. TEM permitted analysis of information about the created nanoparticles shape, size and structure specificity. The possible mechanism of nanoparticle formation was suggested. Antibacterial properties of synthesised composites were characterised using a minimum inhibitory concentration test on six selected bacterial strains. Diatomaceous biosilica containing heteroepitaxially growing silver chloride, metallic silver, and cerium (IV) oxide nanoparticles have been prepared for the first time. The proposed method for synthesising composites did not use toxic reagents, making it environmentally friendly. Graphical Abstract

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“…Kaolinite, diatomite, mesoporous silica, montmorillonite, sepiolite, and zeolite are mainly applicable in nanoparticle aggregation prevention. Their ability to assist the photocatalytic activity of nanosilver in the formation of reactive oxygen species (ROS) or photocatalytic degradation of bacteria is also established [25]. Clinoptilolite is the most investigated among all natural zeolites as a silver deposition matrix and for bactericidal properties.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization, and Cytotoxicity Evaluations of Silver–Zeolite Nanocomposite

Kiradzhiyska,

Batsalova,

Dzhambazov

et al. 2024

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Zeolites of natural origin are materials exhibiting many positive effects on the human body. Silver-modified zeolites have already been introduced as bactericidal agents, although studies dealing with their toxicity are insufficient. This work describes the synthesis of activated and silver-loaded Bulgarian zeolite using a simple wet impregnation method. Morphological characteristics and compositions of natural zeolite, activated zeolite, and Ag-nanocomposites were studied by the X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) methods. Silver loading is approximately 13 wt. %, with mean Ag particle size around 19 nm. Analyses of the samples included antioxidant activity assays based on ABTS radical scavenging ability and in vitro cytotoxicity tests with human normal fibroblasts and three adenocarcinoma cell lines. The experiments were performed with natural, activated, and Ag-modified zeolite in comparison to two commercial food supplements. Our results indicated moderate antioxidant activity of the tested samples. Silver-modified zeolite demonstrated cytotoxic effects against both tumor cells and normal fibroblasts, but the detected levels of inhibition were stronger against the adenocarcinoma cells, suggesting anti-tumor potential. The present article indicates a new aspect of Bulgarian natural zeolite and Ag-loaded zeolite biological activity. It highlights the need for detailed toxicity evaluations of Ag-nanocomposites prior to healthcare applications.

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Synthesis, characterization of silver/kaolinite nanocomposite and studying its antibacterial activity

Cited by 11 publications

References 86 publications

Pyrolized Diatomaceous Biomass Doped with Epitaxially Growing Hybrid Ag/TiO2 Nanoparticles: Synthesis, Characterisation and Antibacterial Application

Pyrolized Diatomaceous Biomass Doped with Epitaxially Growing Hybrid Ag/TiO2 Nanoparticles: Synthesis, Characterisation and Antibacterial Application

Diatomaceous Biosilica Doped with Heteroepitaxially Growing Ag/AgCl/CeO2 Composite Nanoparticles: Synthesis, Characterisation and Antibacterial Application

Synthesis, Characterization, and Cytotoxicity Evaluations of Silver–Zeolite Nanocomposite

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