Capillary device for separation and analysis, microfluidic chip for separation and analysis, analysis method for proteins or peptides, electrophoresis instrument, and microfluidic chip electrophoresis instrument for separation and analysis

Abstract

A method for analyzing a protein and a peptide, includes: providing a capillary for isoelectric focusing; providing a capillary device for separation and analysis having the capillary and a solid-phase extraction column being unified as a single tube-like structure; providing an electrophoresis instrument having the capillary device and the mechanism regulating the pressure difference at both ends of the capillary device; introducing a sample containing a target protein or peptide into the solid-phase extraction column to let the target protein or peptide be adsorbed on the column, and filling the capillary device with a carrier ampholyte solution; starting separation by isoelectric focusing after eluting the target protein or peptide by filling the solid-phase extraction column with electrode solution or acid or base solution, or after firstly eluting the target protein or peptide with an eluting solution containing carrier ampholyte and secondly filling the solid-phase extraction column with electrode solution or acid or base solution; and focusing the eluted target protein or peptide in the capillary for isoelectric focusing.