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    Fluorinated vs hydrogenated surfactants in mixtures with valinomycin—The Langmuir monolayer study

    Year: 2010

    Journal: Colloids and Surfaces B: Biointerfaces, 2010, 77 (2), 298-300, 20131009

    Authors: Marcin Broniatowski, Nuria Vila-Romeu, Patrycja Dynarowicz-Łątka

    Organizations: Jagiellonian University, Faculty of Chemistry, Ingardena 3, 30-060 Kraków, Poland; University of Vigo, Faculty of Sciences, Campus Ourense, As Lagoas s/n, 32007 Ourense, Spain

    Selected fluorinated and hydrogenated surfactants, namely a semifluorinated alkane (SFA): 1,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10-henicosafluorononacosane (F10H19), two long chain alcohols: 18,18,18,17,17,16,16,15,15,14,14,13,13,12,12,11,11-heptadecafluorooctadecane-1-ol (F8H10OH) and octadecane-1-ol (C18OH) and with two long chain thiols of the analogous apolar part structure to the above-mentioned alcohols, i.e.: 18,18,18,17,17,16,16,15,15,14,14,13,13,12,12,11,11-heptadecafluorooctadecane-1-thiol (F8H10SH) and octadecane-1-thiol (C18SH) have been tested in mixtures with valinomycin as potential artificial matrixes for its immobilization. The thermodynamic analysis (ΔGexcvsXval plots) based on surface pressure–area isotherm registration for particular valinomycin/surfactant mixtures, complemented with BAM images of the films structure indicate that only fluorinated surfactants are suitable materials for valinomycin incorporation as they form homogeneous miscible monolayers at Xval below 0.5.