Anion influence on extraction and transport of amino acid methyl esters by functionalised calix[4]arene |
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| Authors: | Lucia Mutihac Ioana Varduca Enache Elena Diacu Radu-Cristian Mutihac Jacques Vicens |
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| Institution: | 1. Department of Analytical Chemistry, University of Bucharest, 4-12 Regina Elisabeta Blvd., 030018 Bucharest, Romaniamutihac@upcmail.ro vicens@unistra.fr;3. Department of Analytical Chemistry, University of Bucharest, 4-12 Regina Elisabeta Blvd., 030018 Bucharest, Romania;4. Department of Analytical Chemistry, Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, Polizu 1, 011061 Bucharest, Romania;5. Laboratory for Physics and Chemistry of Interfaces, Department of Microsystems Engineering-IMTEK, University of Freiburg, Freiburg, Germany;6. IPHC-ULP-ECPM-CNRS, Laboratory of Molecular Conception, University of Strasbourg, 25, rue Becquerel, F-67087 Strasbourg, France |
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| Abstract: | The liquid–liquid extraction of a series of amino acid methyl esters has been carried out with functionalised calix4]arene (5,11,17,23-tetrakis(N-methylpiperazino)-25,26,27,28-tetrahydroxycalix4]arene) from an aqueous phase into a chloroform phase as ion pairs in the presence of picrate ion or tropaeolin 00 as counter ion in order to study the molecular recognition properties of this receptor. The active transport assisted by pH gradient of amino acids as ion pairs through liquid membrane employing the functionalised calix4]arene as carrier has been investigated. The results showed that the receptor exhibits good extractability towards amino acids and it can also act as carrier through liquid membrane aiming to the separation of amino acids. It was highlighted that the anion nature used as counter ion, the structure of calix4]arene, and the structure of amino acids are responsible for the experimental results obtained. High yields in both amino acids extraction and transport were obtained for picrate ion used as counter ion. |
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| Keywords: | functionalised calix[4]arene amino acids liquid–liquid extraction membrane transport |
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