Simple sampling device for capillary isotachophoresis and capillary zone electrophoresis

A simple sampling device for isotachophoresis and zone electrophoresis is described, whereby the sample solution is introduced directly into a broadened part of the capillary tube by two feeders, placed perpendicularly to the capillary tube. The advantage of this sampling device is that with the absence of moving parts, automation of the sample introduction can be carried out in an simple way, cleaning is simple and the device is inexpensive. Experiments showed that a reproducibility of less than 2% can be obtained, including the day to day variations using different sample solutions