title: Integration of a contactless conductivity detector into a commercial capillary cassette. Detection of inorganic cations and catecholamines.
abstract: A contactless conductivity detector integrated into the capillary cassette of Agilent (3D)CE equipment is described. The detector is user-friendly, compact and easily modified. The UV detector of the (3D)CE equipment is available parallel with the contactless conductivity detector increasing the detection power. Two electrolyte solutions, 2-(N-morpholino)ethanesulfonic acid-histidine solution (20 mM, pH 6.0) and ammonium acetate (10 mM, pH 4.0), were used as the separation media for inorganic cations and organic catecholamines, respectively. The detection limit for all metal cations except barium was under 0.5 mg/l, and that for four catecholamines was ca. 10 mg/l. This last value was the same order of magnitude as achieved with parallel UV detection.
authors.affiliation: Laboratory of Analytical Chemistry, Department of Chemistry, University of Helsinki, P.O. Box 55, FIN-00014 University of Helsinki, Finland.
authors.forename: Pasi S
authors.initials: PS
authors.lastname: Vuorinen
authors.forename: Matti
authors.initials: M
authors.lastname: Jussila
authors.forename: Heli
authors.initials: H
authors.lastname: Sirén
authors.forename: Sami
authors.initials: S
authors.lastname: Palonen
authors.forename: Marja-Liisa
authors.initials: ML
authors.lastname: Riekkola
mesh_terms: D000085:Acetates; D017738:Alkanesulfonic Acids; D002395:Catecholamines / Q000032:analysis*; D002412:Cations / Q000032:analysis*; D004553:Electric Conductivity; D019075:Electrophoresis, Capillary / Q000379:methods*; D009025:Morpholines; D012680:Sensitivity and Specificity; D013056:Spectrophotometry, Ultraviolet
chemical_list: D000085:Acetates; D017738:Alkanesulfonic Acids; D002395:Catecholamines; D002412:Cations; D009025:Morpholines; C004550:2-(N-morpholino)ethanesulfonic acid; C018824:ammonium acetate