Aqueous mechano-bactericidal action of acicular aragonite crystals

Abstract 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 i...

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Autores principales:	Nobuaki Negishi, Tomohiro Inaba, Yukari Miyazaki, Genki Ishii, Yingnan Yang, Setsuko Koura
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/53650616272d4c8989bc6ab1909db801
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spelling	oai:doaj.org-article:53650616272d4c8989bc6ab1909db8012021-12-02T17:37:41ZAqueous mechano-bactericidal action of acicular aragonite crystals10.1038/s41598-021-98797-w2045-2322https://doaj.org/article/53650616272d4c8989bc6ab1909db8012021-09-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-98797-whttps://doaj.org/toc/2045-2322Abstract 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.Nobuaki NegishiTomohiro InabaYukari MiyazakiGenki IshiiYingnan YangSetsuko KouraNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Nobuaki Negishi Tomohiro Inaba Yukari Miyazaki Genki Ishii Yingnan Yang Setsuko Koura Aqueous mechano-bactericidal action of acicular aragonite crystals
description	Abstract 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.
format	article
author	Nobuaki Negishi Tomohiro Inaba Yukari Miyazaki Genki Ishii Yingnan Yang Setsuko Koura
author_facet	Nobuaki Negishi Tomohiro Inaba Yukari Miyazaki Genki Ishii Yingnan Yang Setsuko Koura
author_sort	Nobuaki Negishi
title	Aqueous mechano-bactericidal action of acicular aragonite crystals
title_short	Aqueous mechano-bactericidal action of acicular aragonite crystals
title_full	Aqueous mechano-bactericidal action of acicular aragonite crystals
title_fullStr	Aqueous mechano-bactericidal action of acicular aragonite crystals
title_full_unstemmed	Aqueous mechano-bactericidal action of acicular aragonite crystals
title_sort	aqueous mechano-bactericidal action of acicular aragonite crystals
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/53650616272d4c8989bc6ab1909db801
work_keys_str_mv	AT nobuakinegishi aqueousmechanobactericidalactionofaciculararagonitecrystals AT tomohiroinaba aqueousmechanobactericidalactionofaciculararagonitecrystals AT yukarimiyazaki aqueousmechanobactericidalactionofaciculararagonitecrystals AT genkiishii aqueousmechanobactericidalactionofaciculararagonitecrystals AT yingnanyang aqueousmechanobactericidalactionofaciculararagonitecrystals AT setsukokoura aqueousmechanobactericidalactionofaciculararagonitecrystals
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Aqueous mechano-bactericidal action of acicular aragonite crystals

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