Gel enthaltende Kapillarsäule mit Polyorgansiloxanüberzug

A polyacrylamide gel electrophoresis column (100) includes a fused-silica tube (202), a polyacrylamide gel matrix (204) and a polydimethysiloxane layer radially between and covalently attached to both the tube and the gel matrix. The method (300) for forming this column involves covalently binding (step 301) polyorganosiloxane to the inner wall (208) of the tube, covalently attaching (step 302) organosilane termini to the organosiloxane layer, and polymerizing (step 303) acrylamide so as to incorporate the organosilane termini into the resulting polyacrylamide gel matrix. Buffer ions are then drawn (step 304) into the column under an electric field of about 1000 volts per centimeter, and, at the same time, different reaction product ions are removed. The polyorganosiloxane layer stretches as the polyacrylamide shrinks during polymerization so that the organosiloxane is at least twice as thick as it would be without the gel matrix attached. The process yields a gel matrix which is securely attached to the tube, void-free, and under minimal mechanical stress. As a result, the column can withstand relatively high-voltage pre-electrophoresis and electrophoresis procedures.