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Determination of different classes of amines with capillary zone electrophoresis and contactless conductivity detection
Authors:Gong Xiao Yang  Hauser Peter C
Institution:Department of Chemistry, University of Basel, Basel, Switzerland.
Abstract:The use of contactless conductivity detection for the determination of different organic amines in CE was successfully demonstrated. Aliphatic non UV-absorbing species could be determined along absorbing compounds by measuring the conductivity of their protonated forms. The species tested included short-chained aliphatic primary, secondary and tertiary amines, branched aliphatic amines, diamines, hydroxyl-substituted amines as well as species incorporating aromatic and non-aromatic cyclic moieties. Highest sensitivity was obtained with BGE solutions containing solely acetic acid. A concentration of 0.5 M at a pH value of 2.5 was used. Detection limits were in the order of 1 microM. Complete separation of cis- and trans-1,2-diaminocyclohexane could be achieved by adding 18-crown-6 as modifier to the electrolyte solution.
Keywords:Amines  Capillary electrophoresis  Contactless conductivity detection  Dimethylamine  Methylamine
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