Method of electrophoretic analysis of multicomponent solutions and device for performing the same

A device for electrophoretic analysis of multicomponent solutions comprising a capillary having capillary ends, a plurality of vials for electrolyte and sample solutions, a means for setting up said capillary ends and said vials implemented to immerse said capillary ends into said vials, a means for generation of electrolyte flow, a means for applying voltage across said capillary ends, a detector connected to said capillary, and a controlling and signal processing system, wherein the device further comprises a streaming potential measurement means implemented to measure a potential difference between said capillary ends and to form an electric connections with said capillary ends during capillary rinsing in such a way that said streaming potential measurement means and electrolyte inside said capillary and said vials form a closed measurement electric circuit, and said means for generation of electrolyte flow is implemented so as to build up and maintain a preset differential pressure between said capillary ends, and wherein said streaming potential measurement means comprises a means to disconnect said measurement electric circuit during electrophoretic analysis.