ADAPTATION OF A MICRODROP INJECTOR TO SAMPLING IN CAPILLARY ELECTROPHORESIS

A micro injection system is presented that permits the injection of sm all sample droplets into capillaries suitable for capillary electropho resis (CE). Drops of 60-mu m diameter, i.e., 113 pl, were used. The av erage size of the drops produced had a relative standard deviation (R. S.D.) of less than 1%. Good results, i.e., R.S.D. values of less than 3%, were obtained with single-drop injection, whereas the injection of several drops in a row entailed problems with air bubbles during the measurements.