Determination of cichoric acid content in dried press juice of purple coneflower (Echinacea purpurea) with capillary electrophoresis

In this work, an improved capillary electrophoresis method for determining cichoric acid in dried press juice from purple coneflower was developed. The optimal conditions were: electrophoretic buffer-75 mM borate, pH 8.8; injection 20 mbar for 20 s; separation at 20 kV; detection at 350 nm, temperature 35 °C.