Optically active polyelectrolyte multilayers as membranes for chiral separations.
Ultrathin films of chiral polyelectrolyte complex, prepared by the multilayering process, exhibit selectivity in the membrane separations of optically active compounds, such as l- and d-ascorbic acid. The flux through these polyelectrolyte multilayers, PEMUs, is exceptionally high and may be controlled by the concentration of salt present in the permeating solutions. Both in-situ ATR-FTIR and chiral capillary electrochromatography indicate that flux selectivity is mainly kinetically controlled, stemming from a difference in diffusion rates of various enantiomers through PEMUs, rather than a difference in partitioning.
Rmaile
Hassan H
HH
Department of Chemistry and Biochemistry, Center for Materials Research and Technology (MARTECH), The Florida State University, Tallahassee, FL 32306, USA.
Schlenoff
Joseph B
JB
D001205:Ascorbic Acid / Q000302:isolation & purification; D004295:Dihydroxyphenylalanine / Q000302:isolation & purification; D004573:Electrolytes / Q000737:chemistry*; D008567:Membranes, Artificial; D010455:Peptides / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D013237:Stereoisomerism; D014755:Viologens / Q000302:isolation & purification
D004573:Electrolytes; D008567:Membranes, Artificial; D010455:Peptides; D011108:Polymers; D014755:Viologens; D004295:Dihydroxyphenylalanine; D001205:Ascorbic Acid