| Abstract
| - A system for coupling amperometric detection with capillary electrophoresis (CE) is demonstrated. In CE amperometric detection, the separation and detection capillaries are usually coupled with a porous joint to isolatethe detector from the high applied voltage when thecapillary inner diameter is larger than 25 μm. Inthisreport a simple method is suggested. The joint wasprepared by etching the capillary wall with HF after thepolyimide coating of the capillary had been removed.Thisetched joint can efficiently isolate the detector from thehigh applied voltage. The performance of theCE-amperometric detection with an etched joint was evaluated withhydroquinone. The successful separation and amperometric detection of catecholic compounds, diphenols, andphenol have been carried out by this system.
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