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γ-Fe2O3 modified with C-18 carboxylic acids: A magnetic carrier for immobilized organic compounds

  • Molecular and Supramolecular Structures at the Interfaces
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Abstract

Ferromagnetic γ-Fe2O3 was modified with stearic and oleic acids. Diffuse reflection spectra show that modification occurs both via the interaction with free surface hydroxyl groups and by forming bidentate carboxylates with iron atoms. Surface modification enhances adsorption of water-soluble organic dyes (orange acid and methylene blue dyes, cytochrome C enzyme) due to contribution of hydrophobic interaction to adsorption. Differences in adsorption of dyes onto the modified γ-Fe2O3 caused by different structures of hydrocarbon chains in stearic and oleic acids were revealed. The effect of electrolyte concentration and pH of a solution on adsorption of cytochrome C was studied. The activated iron(III) oxide can be used as a magnetic carrier for immobilized enzymes in bioreactors and for targeted drug delivery.

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Correspondence to T. D. Khokhlova.

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Original Russian Text © T.D. Khokhlova, N.A. Zubareva, 2015, published in Fizikokhimiya Poverkhnosti i Zashchita Materialov, 2015, Vol. 51, No. 2, pp. 170–175.

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Khokhlova, T.D., Zubareva, N.A. γ-Fe2O3 modified with C-18 carboxylic acids: A magnetic carrier for immobilized organic compounds. Prot Met Phys Chem Surf 51, 221–225 (2015). https://doi.org/10.1134/S2070205115020094

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  • DOI: https://doi.org/10.1134/S2070205115020094

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