Capillary Electrochromatography (CEC) is a hybrid analytical technique that combines the principles of capillary electrophoresis (CE) and high-performance liquid chromatography (HPLC). It leverages the high efficiency of CE for separating ionic species and the versatility of HPLC stationary phases for a wide range of analytes. This combination allows for highly efficient and selective separations, making CEC particularly useful in the field of Bioanalytical Sciences.