Comparison of proinflammatory potential of needle-shaped materials: aragonite and potassium titanate whisker

Horie, Masanori; Tabei, Yosuke; Sugino, Sakiko; Eguchi, Kenichiro; Chiba, R.; Tajika, Masahiko

doi:10.1007/s00204-019-02556-w

Cited by 4 publications

(2 citation statements)

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“…However, it is known that asbestos, potassium titanate, carbon nanotubes, and metal nanowires demonstrate lung toxicity due to oxidative stress induced by their shape 23 – 25 . On the other hand, it is known that acicular aragonite does not show toxicity toward lung tissue, unlike the aforementioned nanoneedle, nanopillar, and whisker-shaped materials 18 . Aragonite, which is composed of calcium carbonate, easily dissolves in the living tissue and, as a result, morphology-induced toxicity does not manifest.…”

Section: Resultsmentioning

confidence: 99%

“…Many are familiar with the white precipitate (scale) that forms and adheres to faucets; it develops when the concentrations of certain mineral components in tap water are relatively high. This white precipitate is calcium carbonate, with the crystal structure of mainly aragonite or calcite; significantly, aragonite may have a needle crystal habit 18 – 20 . In a previous study, we found that calcium carbonate forms on the surface of TiO 2 photocatalysts during the photocatalysis of calcium bicarbonate contained water, moreover, the calcium carbonate mainly demonstrated the crystallinity of aragonite with nano- to micrometer-sized needles 21 .…”

Section: Introductionmentioning

confidence: 99%

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Aqueous mechano-bactericidal action of acicular aragonite crystals

Negishi

Inaba

Miyazaki

et al. 2021

Sci Rep

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Nanoneedle structures on dragonfly and cicada wing surfaces or black silicon nanoneedles demonstrate antibacterial phenomena, namely mechano-bactericidal action. These air-exposed, mechano-bactericidal surfaces serve to destroy adherent bacteria, but their bactericidal action in the water is no precedent to report. Calcium carbonate easily accumulates on solid surfaces during long-term exposure to hard water. We expect that aragonite nanoneedles, in particular, which grow on TiO2 during the photocatalytic treatment of calcium-rich groundwater, exhibit mechano-bactericidal action against bacteria in water. Here, we showed that acicular aragonite modified on TiO2 ceramics prepared from calcium bicarbonate in mineral water by photocatalysis exhibits mechanical bactericidal activity against E. coli in water. Unmodified, calcite-modified and aragonite-modified TiO2 ceramics were exposed to water containing E. coli (in a petri dish), and their bactericidal action over time was investigated under static and agitated conditions. The surfaces of the materials were observed by scanning electron microscopy, and the live/dead bacterial cells were observed by confocal laser scanning microscopy. As a result, the synergistic bactericidal performance achieved by mechano-bactericidal action and photocatalysis was demonstrated. Aragonite itself has a high biological affinity for the human body different from the other whisker-sharpen nanomaterials, therefore, the mechano-bactericidal action of acicular aragonite in water is expected to inform the development of safe water purification systems for use in developing countries.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%