Abstract: The present invention is related to the decrease of crosstalk, in which part of light emission from a specific capillary is overlayed on the light emission position of its adjoining capillaries and is detected as signal from adjacent capillaries. Study conducted by the inventor has found that the crosstalk contains at least the following components. The signal light from a capillary may propagate through an adjoining capillary or a plurality of capillaries, the reflection at the inner surface of the outer diameter of quartz capillary makes plural signal paths to the photodetector. The crosstalk component may be focused at a point at a predetermined distance from the center axis of the capillary. The present invention is aimed at the control of the range of image to be detected as the capillary signal among the images focused on the photodetector from the capillaries. The present invention may decrease the crosstalk by controlling the detection of the light emission from the adjacent capillaries.

Abstract: An electrophoresis apparatus is provided in which negative effects caused by abnormalities in a current-carrying path in an electrophoresis apparatus can be avoided or reduced. The current flowing in the current-carrying path during electrophoresis can be measured to detect the state of a separating medium, and the application of a voltage to the current-carrying path can be interrupted.

Abstract: An electrophoresis apparatus includes a multi-capillary array having a liquid or solid disposed between the capillaries of the array. The liquid or solid exhibits a refractive index higher than that of air and less than that of water and reduces the amount of laser beams scattered by the capillaries. Also provided are methods of adjusting refracted and reflected excitation light beams passing through capillaries of a multi-capillary array, to reduce loss of intensity of the laser beams and increase irradiation of respective samples disposed in the capillaries.

Abstract: An injection syringe 14 for injecting a gel into a capillary 111, a charging syringe 15 for charging the injection syringe 14 with the gel 10 are attached to a block 17. A check valve 16 is inserted between the both syringes, and the check valve 16 works so as to prevent the gel 10 from flowing back to the charging syringe 15. As the result, the gel charging can be automated, and accordingly the processing ability of the electrophoretic instrument can be improved.

Abstract: At a wall constituting a space for a thermostatic oven in an electrophoresis apparatus, a capillary array attachment portion is formed which permits attachment of a plurality of capillary arrays having different length. Thereby, a selected capillary array constituted by collecting a plurality of capillaries can be easily attached to the electrophoresis apparatus depending on measurement purpose.

Abstract: A capillary array includes a light detection portion, a sample supply portion, a buffer solution supply portion and a voltage application portion which are necessary functions for electrophoresis, thereby, when assembling the capillary array into an electrophoresis apparatus, the same can be immediately used. Accordingly, a capillary array is provided which can be easily incorporated into an electrophoresis apparatus.

Abstract: An injection syringe 14 for injecting a gel into a capillary 111, a charging syringe 15 for charging the injection syringe 14 with the gel 10 are attached to a block 17. A check valve 16 is inserted between the both syringes, and the check valve 16 works so as to prevent the gel 10 from flowing back to the charging syringe 15. As the result, the gel charging can be automated, and accordingly the processing ability of the electrophoretic instrument can be improved.