Open-tubular capillary electrochromatography/electrospray ionization-mass spectrometry using polymeric surfactant as a stationary phase coating.
We describe the use of the polymeric surfactant poly(sodium undecylenic sulfate) (poly-SUS) as a stationary phase coating in open-tubular capillary electrochromatography (OT-CEC) coupled with electrospray ionization-mass spectrometry (ESI-MS) for the analysis of beta-blocker and benzodiazepine analytes. The production of a polymeric surfactant coating on the capillary inner wall involves (i) adsorption of the cationic polymer poly(diallyldimethylammonium chloride) (PDADMAC) to the inner surface of capillary, and (ii) adsorption of the negatively charged poly-SUS onto the cationic polymer layer via strong physical interaction of the two polymer layers. As compared with micellar electrokinetic chromatography (MEKC) coupled with ESI-MS, the main advantage of this proposed method is minimization of introduction of the monomeric or polymeric surfactant into the mass spectrometer, thus avoiding the interference of the nonvolatile micelle in ESI-MS. The effects of buffer pH and applied voltage on the separation of the analytes are also discussed. Under optimum conditions, four of the five beta-blockers and four benzodiazepines are separated.
Zhu
Xiaofeng
X
Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803, USA.
Kamande
Mary W
MW
Thiam
Serigne
S
Kapnissi
Constantina P
CP
Mwongela
Simon M
SM
Warner
Isiah M
IM
D000319:Adrenergic beta-Antagonists / Q000032:analysis; D001569:Benzodiazepines / Q000032:analysis; D020374:Chromatography, Micellar Electrokinetic Capillary; D019075:Electrophoresis, Capillary / Q000295:instrumentation / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D008823:Micelles; D011108:Polymers / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D013501:Surface-Active Agents / Q000737:chemistry
D000319:Adrenergic beta-Antagonists; D008823:Micelles; D011108:Polymers; D013501:Surface-Active Agents; D001569:Benzodiazepines; D012822:Silicon Dioxide