title: Improved preparative-scale. continuous, free-flow electrophoretic separation of the enantiomers of terbutaline utilizing equal-but-opposite enantiomer mobilities.
abstract: The factors that influence yield and product purity in the continuous, preparative-scale electrophoretic separation of the enantiomers of terbutaline when using the principle of equal-but-opposite effective mobilities were studied. The sodium salt of heptakis-6-sulfato-beta-cyclodextrin was used as the resolving agent, in acidic, isopropanol-containing background electrolytes, in the continuous, free-flow, preparative electrophoretic instrument, the Octopus. By matching the linear velocity of the feed solution to that of the background electrolyte, lateral hydrodynamic dispersion was minimized resulting in a nonelectrophoresed feed band that was only three fractions (about 3 mm) wide as it exited the 0.5 m long separation channel. The multiple of residence time and applied potential was also optimized, constrained by migration of the front of heptakis-6-sulfato-beta-cyclodextrin out of the separation zone, leading to the recovery of 95% of both enantiomers in better than 99.99% purity, at a production rate of 0.1 mg/h.
authors.affiliation: Chemistry Department, Texas A&M University, College Station 77842-3012, USA.
authors.forename: P
authors.initials: P
authors.lastname: Glukhovskij
authors.forename: G
authors.initials: G
authors.lastname: Vigh
mesh_terms: D002021:Buffers; D019075:Electrophoresis, Capillary / Q000379:methods*; D013726:Terbutaline / Q000302:isolation & purification*; D013997:Time Factors
chemical_list: D002021:Buffers; D013726:Terbutaline