title: Enantioselective transport and liquid-liquid extraction of amino acids as their potassium and sodium salts by optically active diaza-18-crown-6 ethers.
abstract: Complexation of amino acids as their sodium and potassium salts by optically active diaza crown ethers has been investigated in transport across bulk liquid membranes containing the carriers and in extraction experiments. The observed enantioselectivity was achieved by (noncovalent) steric and repulsive interactions between the side arm of the crown ether and functional group(s) of the amino acids. The highest enantioselectivity was observed in the case of tryptophan.
authors.affiliation: Department of Chemistry, Faculty of Science, University of Dicle, Diyarbakir, Turkey.
authors.forename: Nadir
authors.initials: N
authors.lastname: Demirel
authors.forename: Yasemin
authors.initials: Y
authors.lastname: Bulut
authors.forename: Halil
authors.initials: H
authors.lastname: Hoşgören
mesh_terms: D000596:Amino Acids / Q000737:chemistry*; D001692:Biological Transport; D004987:Ethers / Q000737:chemistry*; D007700:Kinetics; D008567:Membranes, Artificial; D008956:Models, Chemical; D011188:Potassium / Q000737:chemistry*; D012964:Sodium / Q000737:chemistry*; D013237:Stereoisomerism; D013997:Time Factors; D014364:Tryptophan / Q000737:chemistry
chemical_list: D000596:Amino Acids; D004987:Ethers; D008567:Membranes, Artificial; D014364:Tryptophan; D012964:Sodium; D011188:Potassium