Nonaqueous capillary electrophoresis chiral separations with quaternary ammonium beta-cyclodextrin.
Chiral separation of nonsteroidal anti-inflammatory drugs (profens), 1,1'-binaphthyl-2,2'-diyl-hydrogen phosphate, N-[1-(1-naphthyl)ethyl]phthalamic acid, and derivatized amino acids by a cationic cyclodextrin, quaternary ammonium beta-cyclodextrin (QA-beta-CD), was investigated by capillary electrophoresis (CE) in both aqueous and nonaqueous media. Several profens and amino acids could only be separated by QA-beta-CD in pure formamide system. No chiral separation of the profens was achieved in the following solvents: N-methylformamide, methanol, dimethyl sulfoxide, and water; however, chiral separations of most of the amino acids were obtained in all of these solvents. The effects of other experimental parameters such as the CD concentration and apparent pH (pH*) were also investigated. The first application of nonaqueous CE chiral separation of ketoprofen in a commercially available sample, Actron, was also examined. In addition, the reversal of electroosmotic flow by QA-beta-CD was observed in water, formamide, N-methylformamide, methanol, and dimethyl sulfoxide media.
Department of Chemistry, North Carolina State University, Raleigh 27695-8204, USA.
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Wang
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Khaledi
D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000302:isolation & purification*; D003505:Cyclodextrins / Q000737:chemistry*; D019075:Electrophoresis, Capillary / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D000644:Quaternary Ammonium Compounds / Q000737:chemistry; D012997:Solvents; D013237:Stereoisomerism; D047392:beta-Cyclodextrins
D000894:Anti-Inflammatory Agents, Non-Steroidal; D003505:Cyclodextrins; D000644:Quaternary Ammonium Compounds; D012997:Solvents; D047392:beta-Cyclodextrins; C031215:betadex