Antibacterial activity of new magnetic Ag/TiO2 nanocomposite in silane sol–gel matrix

Allafchian, Alireza; Jalali, Seyed Amir Hossein; Amiri, Razieh; Shahabadi, Shirin

doi:10.1007/s10854-017-7049-5

Cited by 7 publications

(4 citation statements)

References 48 publications

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“…The diluted sample tubes were next transferred to nutrient agar plates to determine MBC values after another 24 h of incubation. That is when no observable bacterial growth is detected on the nutrient agar [152].…”

Section: Characterisation Techniques Of Antibacterial Mnpsmentioning

confidence: 99%

Antibacterial magnetic nanoparticles for therapeutics: a review

Allafchian

Hosseini

2019

IET Nanobiotechnology

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Along with the extensive range of exotic nanoparticle (NPs) applications, investigation of magnetic NPs (MNPs) in vitro has ushered modern antibacterial studies into an increasingly attractive research area. A great number of microorganisms exist in the size scales from nanometre to micrometre regions. The enormous potential of engineered MNPs in therapeutic procedures against various drug-resistant bacteria has declined the menace of fatal bacterial infections. Many biocompatible MNPs have been introduced that possess remarkable impacts on various bacterial strains. Conventional synthesis methods such as co-precipitation or hydrothermal techniques have been widely adopted in the production of MNPs. The MNPs for antibacterial applications are mainly required to be superparamagnetic, recyclable and biocompatible. To implement novel strategies in developing new generation antimicrobial magnetic nanomaterials, it is essential to obtain a comprehensive preview of recent achievements in synthesis, proposed antibacterial mechanisms and characterisation techniques of these nanomaterials. This review highlights notable aspects of antibacterial activity in engineered MNPs and nanocomposites including their particle properties (size, shape and saturation magnetisation), antibacterial mechanisms, synthesis methods, testing methods, surface modifications and minimum inhibitory concentrations.

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Section: Characterisation Techniques Of Antibacterial Mnpsmentioning

confidence: 99%

Antibacterial magnetic nanoparticles for therapeutics: a review

Allafchian

Hosseini

2019

IET Nanobiotechnology

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“…The antimicrobial activity and usability of silver can be tuned by combining it with other materials in the form of core-shell particles [30,31], or just by putting AgNPs into composite materials with inertia matrix [32,33,34], antimicrobial graphene oxide [35,36,37] or by using magnetic substrate for better subsequent separation [38,39]. The other thing concerning these composites, which should be highlighted, is the possible synergistic effect between two or more antimicrobial agents.…”

Section: Introductionmentioning

confidence: 99%

Antimicrobial Synergistic Effect Between Ag and Zn in Ag-ZnO·mSiO2 Silicate Composite with High Specific Surface Area

et al. 2019

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Antimicrobial materials are widely used for inhibition of microorganisms in the environment. It has been established that bacterial growth can be restrained by silver nanoparticles. Combining these with other antimicrobial agents, such as ZnO, may increase the antimicrobial activity and the use of carrier substrate makes the material easier to handle. In the paper, we present an antimicrobial nanocomposite based on silver nanoparticles nucleated in general silicate nanostructure ZnO·mSiO2. First, we prepared the silicate fine net nanostructure ZnO·mSiO2 with zinc content up to 30 wt% by precipitation of sodium water glass in zinc acetate solution. Silver nanoparticles were then formed within the material by photoreduction of AgNO3 on photoactive ZnO. This resulted into an Ag-ZnO·mSiO2 composite with silica gel-like morphology and the specific surface area of 250 m2/g. The composite, alongside with pure AgNO3 and clear ZnO·mSiO2, were successfully tested for antimicrobial activity on both gram-positive and gram-negative bacterial strains and yeast Candida albicans. With respect to the silver content, the minimal inhibition concentration of Ag-ZnO·mSiO2 was worse than AgNO3 only for gram-negative strains. Moreover, we found a positive synergistic antimicrobial effect between Ag and Zn agents. These properties create an efficient and easily applicable antimicrobial material in the form of powder.

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“…The advantages of this method are high purity, narrow particle size distribution, and a homogeneous nanostructure at a low temperature [11]. This method has better compositional homogeneity, resulting in the better absorption of NPs, easy control, and lower cost, as compared with others [19]. The sol–gel process is a suitable method for the preparation of oxide films from the alkoxysilyl group containing materials through the continuous stages of hydrolysis and density.…”

Section: Introductionmentioning

confidence: 99%

“…So, new composites with antibacterial properties are prepared without the release of particles [9]. Studies have indicated that nanocomposites of magnetic NPs, especially iron oxide, can be an attractive choice to solve this problem; this is because the magnetic core mid reasonable polymer controls the release of Ag + , and these compounds are useful in medicinal and antibacterial fields [9–11, 19, 21–24]. Certainly, magnetic NPs can be strong and has been used for the drug delivery system and water purification, because they can be easily applied by an external magnetic field and used by the target tissue.…”

Section: Introductionmentioning

confidence: 99%

Preparation of amino silane magnetic nanocomposite by the sol–gel process and investigation of its antibacterial activity

Hatami

Allafchian

Karimzadeh

2019

Micro & Nano Letters

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The results of a comparative investigation on microstructure and magnetic characteristics of silane magnetic nanocomposites coated with silver nanoparticles (AgNPs) are presented. The authors used tetraethyl orthosilicate (TEOS) with (3-aminopropyl) triethoxysilane (APTES) to improve the antibacterial properties of AgNPs. On the basis of this approach, TEOS-APTES polymer was made by the sol-gel method. A layer of the polymer was set on the magnetic core of Fe 3 O 4 NPs and then AgNPs were coated on the TEOS-APTES surface. Therefore, the core-shell structure of the Fe 3 O 4 /TEOS-APTES/Ag polymer nanocomposite was synthesised. To characterise the crystal morphology, structure, and size of nanocomposites, various techniques and experiments including Fourier transform infrared spectroscopy, X-ray diffraction, field-emission scanning electron microscope, dynamic light scattering, and transmission electron microscope were used. Vibrating sample magnetometer showed the magnetic properties of the samples. Finally, antibacterial activity against Gram-negative and Gram-positive bacteria including Escherichia Coli (American Type Culture Collection (ATCC) 35218), Salmonella typhimurium (ATCC 14028), Staphylococcus aureus (ATCC 292113) and Bacillus cereus (ATCC 14579) was showed by the disc diffusion analysis. The results indicated the uniform distribution of AgNPs on the polymer surface. Fe 3 O 4 /TEOS-APTES/Ag nanocomposite showed much better antibacterial activity in comparison with AgNPs only.

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Antibacterial activity of new magnetic Ag/TiO2 nanocomposite in silane sol–gel matrix

Cited by 7 publications

References 48 publications

Antibacterial magnetic nanoparticles for therapeutics: a review

Antibacterial magnetic nanoparticles for therapeutics: a review

Antimicrobial Synergistic Effect Between Ag and Zn in Ag-ZnO·mSiO2 Silicate Composite with High Specific Surface Area

Preparation of amino silane magnetic nanocomposite by the sol–gel process and investigation of its antibacterial activity

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