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• W2315696614 endingPage "18218" @default.
• W2315696614 startingPage "18209" @default.
• W2315696614 abstract "Earlier we have shown that many important properties of ionic aqueous channels in biological membranes can be imitated using simple biomimetic membranes. These membranes are composed of mixed cellulose ester-based filters, impregnated with isopropyl myristate or other esters of fatty acids, and can be used for high-throughput drug screening. If the membrane separates two aqueous solutions, combination of relatively hydrophilic polymer support with immobilized carboxylic groups results in the formation of thin aqueous layers covering inner surface of the pores, while the pore volume is filled by lipid-like substances. Because of these aqueous layers biomimetic membranes even without proteins have a cation/anion ion selectivity and specific (per unit of thickness) electrical properties, which are similar to typical properties of biological membranes. Here we describe frequency-dependent impedance of the isopropyl myristate-impregnated biomimetic membranes in the 4-electrode arrangement and present the results as Bode and Nyquist diagrams. When the membranes are placed in deionized water, it is possible to observe three different dispersion processes in the frequency range 0.1 Hz to 30 kHz. Only one dispersion is observed in 5 mM KH2PO4 solution. It is suggested that these three dispersion features are determined by (a) conductivity in aqueous structures/channels, formed near the internal walls of the filter pores at high frequencies, (b) dielectric properties of the whole membrane at medium frequencies, determined by polymer support, aqueous layers and impregnating oil, and, finally, (c) by the processes in hydrated liquid crystal structures formed in pores by impregnating oil in contact with water at low frequencies." @default.
• W2315696614 created "2016-06-24" @default.
• W2315696614 creator A5075458404 @default.
• W2315696614 creator A5077152077 @default.
• W2315696614 date "2010-10-29" @default.
• W2315696614 modified "2023-09-26" @default.
• W2315696614 title "Biomimetic Membranes with Aqueous Nano Chanels but without Proteins: Impedance of Impregnated Cellulose Ester Filters" @default.
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• W2315696614 doi "https://doi.org/10.1021/la102345t" @default.
• W2315696614 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/21033753" @default.
• W2315696614 hasPublicationYear "2010" @default.
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