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Direct evidence for the electroconvective mechanism of neutral amino acid transport during electrodialysis
Institution:1. Department of Chemistry, Voronezh State University, 394018 Voronezh, Russian Federation;2. Faculty of Science, Tishreen University, 2237 Latakia, Syrian Arab Republic;1. I. Ya. Postovsky Institute of Organic Synthesis, Ural Branch of the Russian Academy of Sciences, 620990 Ekaterinburg, Russian Federation;2. Perm National Research Polytechnic University, 614990 Perm, Russian Federation;1. Department of Chemistry, M. V. Lomonosov Moscow State University, 119991 Moscow, Russian Federation;2. A. N. Belozersky Institute of Physico-Chemical Biology, M. V. Lomonosov Moscow State University, 119991 Moscow, Russian Federation;1. P. G. Demidov Yaroslavl State University, 150003 Yaroslavl, Russian Federation;2. Institute of Physiologically Active Compounds, Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences, 142432 Chernogolovka, Moscow Region, Russian Federation;1. Platov South-Russian State Polytechnic University, 346428 Novocherkassk, Russian Federation;2. N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 119991 Moscow, Russian Federation
Abstract:For the first time, direct evidence was obtained using laser interferometry and flicker-noise spectroscopy that the main cause of the increase in the transport of amino acids through a sulfonated cation-exchange membrane in intense current modes is electroconvection. The turbulent nature of electroconvective vortices at the solution/membrane interface, acidification of the solution in the demineralization compartment and a substantial intensification of amino acid fluxes under over-limiting current modes were revealed. This indicates the electroconvective destruction of the barrier effect of the solution layer with a high pH value near the cation-exchange membrane.
Keywords:phenylalanine  demineralization  electrodialysis  heterogeneousmembrane  cation-exchangeresincontent  electroconvection  water splitting  laser interferometry  flicker noise spectroscopy
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