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A micromachined injection device is described, which can be connected to a fused-silica capillary. This allows injection without interrupting the current, which is an advantage in CZE and essential in correlation CZE. A typical property is the excellent connection, with low dead volume, between the capillary and the microchip. This results in very good repeatability of the peak parameters as is demonstrated by conventional electrokinetic injections. Correlation CZE experiments showed a considerable improvement in S/N ratio at high as well as at low concentrations. An 8-fold improvement in detection limit is achieved. The repeatability of peak height and peak area in correlation CZE was even better than obtained with conventional CZE.

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