Extraction and transport behaviour of aromatic amino acids by modified cyclodextrin

Abstract

The extraction efficiency together with the active transport assisted by the pH gradient through liquid membrane of some aromatic native and derivative amino acids by using heptakis (2,3,6-tri-O-acetyl)-β-cyclodextrin as extractant agent or carrier has been studied. The modified cyclodextrin extracted aromatic amino acids, native (l-tryptophane, l-phenylalanine, and l-tyrosine) and their methylester derivatives from aqueous phase into the organic phase. Moreover, the modified cyclodextrin exhibits the carrier abilities for amino acid methylesters through liquid membrane. In the case of transport processes involving liquid membranes, the physicochemical properties of the solvents play an important role in membrane stability. The results demonstrated that the inclusion properties of the investigated host are correlated with the structural properties of amino acids, and they also suggest further possibilities for optimal separation of amino acids derivatives. Extraction and active transport through liquid membrane of some aromatic amino acids by using modified cyclodextrin.