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• W2090545239 abstract "A ferriprotoporphyrin, hemin (Fe3+), modified with 3,7,11,15-tetramethyl-2-hexadecen-1-ol, phytol, was adsorbed in nano-spaces of about 4 nm in diameter in mesoporous silica (FSM; folded-sheet mesoporous material) forming a phytol-modified hemin (Fe3+)–FSM nano-conjugate. The properties and the structure of the conjugate were studied by UV-visible light absorption, IR absorption spectroscopy, and a nitrogen adsorption isotherm. Although the hemin without phytol could not be adsorbed to the mesoporous silica, modification with phytol imparted preferential adsorption properties. The conjugate was not only stable but also had a peroxidase-like activity in a 0.1% hydrogen peroxide solution, while free hemin in the solution was easily destroyed. The hemin (Fe3+) in the FSM was reduced to heme (Fe2+) by hydrazine. The phytol-modified heme (Fe2+)–FSM conjugate formed an O2–heme complex with a superoxide type structure, resembling oxyhemoglobin or oxymyoglobin, which has not been previously observed for free heme in solution. The addition of carbon monoxide or nitrogen monoxide to the phytol-modified heme (Fe2+)–FSM conjugate caused the formation of CO– or NO–heme complex in the nano-spaces of the FSM. These properties are attributed not only to the Fe-complex but also to the cooperative functions of the heme with mesoporous silica, resembling properties of a natural heme–protein conjugate; hemoglobin or peroxidase. These results are an elegant example of biomimetic nano-technology. © 2005 Wiley Periodicals, Inc." @default.
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• W2090545239 date "2006-01-01" @default.
• W2090545239 modified "2023-10-10" @default.
• W2090545239 title "Phytol-modified heme in mesoporous silica: Conjugates as models of hemoproteins" @default.
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• W2090545239 doi "https://doi.org/10.1002/bit.20734" @default.
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