Patent ID: 8702949

Claim:
A capillary electrophoresis apparatus comprising: at least one capillary, a power supply configured to apply voltage to both ends of the at least one capillary, an optical unit configured to irradiate a sample separated by electrophoresis in the at least one capillary with an excited light and configured to detect fluorescence emitted from the sample, a solution reservoir apparatus configured to reserve a sample or solution, and an autosampler configured to transport the solution reservoir apparatus, wherein the solution reservoir apparatus comprises: a container configured to reserve a sample or solution, a cover having a bore through which the at least one capillary is passed and configured to cover the container, an evaporation-preventing membrane configured for positioning on the cover, and a container holder configured to hold the container, wherein: the evaporation-preventing membrane comprises at least one projection configured for passing through the bore on the cover, said at least one projection comprises a capillary hole having a cylindrical section, an end bore, and at least two protruding portions provided at the outer periphery of the cylindrical section of the capillary hole, wherein the at least two protruding portions are configured for engaging with the bore on the cover when the evaporation-preventing membrane is positioned on the cover.