Integration of a contactless conductivity detector into a commercial capillary cassette. Detection of inorganic cations and catecholamines.
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.
Vuorinen
Pasi S
PS
Laboratory of Analytical Chemistry, Department of Chemistry, University of Helsinki, P.O. Box 55, FIN-00014 University of Helsinki, Finland.
Jussila
Matti
M
Sirén
Heli
H
Palonen
Sami
S
Riekkola
Marja-Liisa
ML
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
D000085:Acetates; D017738:Alkanesulfonic Acids; D002395:Catecholamines; D002412:Cations; D009025:Morpholines; C004550:2-(N-morpholino)ethanesulfonic acid; C018824:ammonium acetate