title: Electrophoretic separations with polyether ether ketone capillaries and capacitively coupled contactless conductivity detection.
abstract: Polyether ether ketone (PEEK) capillaries were found to be compatible with capacitively-coupled contactless-conductivity detection (C4D). Detection limits in the order of 10(-7) M were obtained with C4D employing a high excitation voltage (HV-C4D) for inorganic cations and anions. The organic polymer capillary shows a relatively low electroosmotic flow of 2.6 x 10(-4) cm2 V(-1) s(-1). Thus inorganic anions and slower organic anions can be separated with a PEEK capillary in a single run without flow modifier. This feature also enables the analysis of both, cations and (fast and slow) anions, in a sample in two subsequent runs just by reversing the polarity or in a single run if dual opposite end injection is employed.
authors.affiliation: University of Basel, Department of Chemistry, Spitalstrasse 51, 4004 Basel, Switzerland.
authors.forename: Jatisai
authors.initials: J
authors.lastname: Tanyanyiwa
authors.forename: Sandro
authors.initials: S
authors.lastname: Leuthardt
authors.forename: Peter C
authors.initials: PC
authors.lastname: Hauser
mesh_terms: D004563:Electrochemistry / Q000379:methods*; D019075:Electrophoresis, Capillary / Q000379:methods*; D007659:Ketones / Q000737:chemistry*; D012680:Sensitivity and Specificity
chemical_list: D007659:Ketones