| 摘要 |
<p>Analysis of a nucleic acid sample is conducted by capillary electrophoresis for a nucleic acids having thousands of bases, the electrophoretic section (2) is provided with a first capillary (14) filled with an agarose gel and a second capillary filled with a polyacrylamide gel. An on-column detector is incorporated with the second capillary for optical detection. To fill a capillary with a gel, a first solution is fed under high pressure from a first flow channel through a switching valve to the capillary and then a second solution for gelling is injected into a second flow channel through the switching valve. After switching, the first flow channel is connected to the second flow channel through the switching valve for filling the capillary. To inject a sample in the capillary, a sample injector is connected to a first flow channel having a first passage (85) passing through a switching valve (71-73) and then connecting a buffer solution to the capillary through a second flow channel (77) having a second passage (76) passing through the switching valve. The switching valve is then switched to a position wherein the first flow passage (85) is incorporated into the second flow channel (77) between the buffer solution (75) and the capillary being filled. Then, the sample can be electro-kinetically injected into the capillary. <IMAGE></p> |
