X-ray Absorption Fine Structure Analysis of Ag and Zn in the Glaze of Anti-bacterial Ceramics

Kato, Yuzo; Isu, Norifumi; Yamazaki, Shoko; Nakahira, A.; Numako, Chiya; Saito, N.H.; Takai, Osamu

doi:10.14723/tmrsj.33.829

Cited by 4 publications

(2 citation statements)

References 1 publication

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“…The XANES region is sensitive to the electronic structure information of atoms and can be used to qualitatively assign the coordination geometry of central atoms, formal oxidation states, etc. XANES provides information about the valence of the absorption elements and crystal structure of specimens (Kato et al 2008). The comparison of the cadmium L 3 -edge XANES spectra of the model compounds showed that this technique enables a clear distinction between S and O ligands (Isaure et al 2006).…”

Section: Methodsmentioning

confidence: 99%

The cadmium-hypertolerant fern,Athyrium yokoscense, exhibits two cadmium stress mitigation strategies in the roots and the aerial parts

Ukai,

Taoka,

Kamada

et al. 2023

Preprint

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Athyrium yokoscenseis hypertolerant to cadmium (Cd) and can grow normally under a high Cd concentration despite Cd being a highly toxic heavy metal. To mitigate Cd stress in general plant species, Cd is promptly chelated with a thiol compound and is isolated into vacuoles. Generated active oxygen species (ROS) in the cytoplasm are removed by reduced glutathione. However, we found many differences in the countermeasures inA. yokoscense. Thiol compounds accumulated in the stele of the roots, although a long-term Cd exposure induced Cd accumulation in the aerial parts. Synchrotron radiation-based X-ray fluorescence (SR-XRF) analysis indicated that a large amount of Cd was localized in the cell walls of the roots. Overexpression ofAyNramp5a, encoding a representative Fe and Mn transporter ofA. yokoscense, increased both Cd uptake and iron and manganese uptake in rice calli under the Cd exposure conditions. Organic acids were abundantly detected inA. yokoscenseroots. Investigating the chemical forms of the Cd molecules by X-ray absorption fine structure (XAFS) analysis detected many compounds with Cd-oxygen (Cd-O) binding inA. yokoscenseroots, whereas in the aerial parts, the ratio of the compounds with Cd-sulfur (Cd-S) binding was increased. Together, our results imply that the strong Cd tolerance ofA. yokoscenseis an attribute of the following two mechanisms: Cd-O compound formation in the cell wall is a barrier to reduce Cd uptake into aerial parts. Thiol compounds in the region of root stele are involved in detoxication of Cd by formation of Cd-S compounds.Statements and DeclarationsNo potential conflict of interest was reported by the authors.

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Section: Methodsmentioning

confidence: 99%

The cadmium-hypertolerant fern,Athyrium yokoscense, exhibits two cadmium stress mitigation strategies in the roots and the aerial parts

Ukai,

Taoka,

Kamada

et al. 2023

Preprint

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“…There are two ways to realize antibacterial properties for ceramic tiles. The first is to coat the surface glaze with an antibacterial material, and the second is to include the antibacterial material in the surface glaze composition [7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Conventional antibacterial porcelains are prepared by coating the surface glaze with a polymer solution or nano metal oxide (ZnO, CuO) sol that has sterilizing properties.…”

Section: Introductionmentioning

confidence: 99%

Antibacterial persistence of hydrophobically glazed ceramic tiles

Kim

Han

et al. 2022

J. Korean Ceram. Soc.

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The antibacterial properties and durability of copper-glazed ceramic tiles were systematically investigated in detail in terms of the hydrophobicity change with glaze thickness. The water contact angle of the standard glaze without copper was 25.2° ± 0.2°, whereas the copper glaze showed hydrophobicity which was dependent on the glaze thickness. A maximum contact angle of 109.6° ± 0.4° was measured from the copper-glazed surface with thickness of 150-200 μm. As the contact angle and hydrophobicity of the copper glaze increased, the antibacterial efficiency against Staphylococcus aureus and Escherichia coli also increased. An antibacterial efficiency of 99.9% was demonstrated from the copper-glazed sample with the thickness of 150-200 μm. In addition, it was confirmed that 99.9% of the antibacterial efficiency of the copper-glazed ceramic tiles could be maintained for at least 2 years. In ion dissolution measurements of the standard and copper glazes, Ca, Na, Si, and K ions were observed, and Cu ion dissolution was only observed from the copper glaze. These results suggests that the hydrophobicity and strongly negative surface charge, which were contributed from Cu addition into the glaze composition, could block the access of bacteria to the glaze surface, and bacterial killing via Cu ion dissolution occurs.

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Antibacterial behavior of copper glazes: effect of copper(II) oxide concentrations and sintering atmospheres

Choi

Kim

Han

et al. 2021

J. Korean Ceram. Soc.

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X-ray Absorption Fine Structure Analysis of Ag and Zn in the Glaze of Anti-bacterial Ceramics

Cited by 4 publications

References 1 publication

The cadmium-hypertolerant fern,Athyrium yokoscense, exhibits two cadmium stress mitigation strategies in the roots and the aerial parts

The cadmium-hypertolerant fern,Athyrium yokoscense, exhibits two cadmium stress mitigation strategies in the roots and the aerial parts

Antibacterial persistence of hydrophobically glazed ceramic tiles

Antibacterial behavior of copper glazes: effect of copper(II) oxide concentrations and sintering atmospheres

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