Abstract: A multicapillary electrophoresis system includes juxtaposed capillaries, at least one source configured for the emission of a light beam intended to excite molecules lying in its path and inside the capillaries and detects the fluorescence of the molecules excited by the light beam. Light that emerges at the exit of the capillaries and that propagates along the direction in that the capillaries extend is detected. The resolution for detection is high enough to distinguish light that emerges at the exit of each of the capillaries. A first liquid is located outside of the capillaries. A second liquid is located inside of the capillaries. The first liquid has a first refractive that is equal to or greater than the refractive index of the second liquid. A mirror is facing the source on the side of the capillaries which is opposed to the source.

Abstract: The invention concerns a multiple capillary electrophoresis system including many juxtaposed capillaries, at least one source for transmitting a beam designed to excite the molecules present in its path and inside the capillaries, and detection of the fluorescence of the molecules excited by said beam. The invention is arranged so as to detect the light emerging at the output of said capillaries and propagated along a direction wherein the capillaries extend and the detection resolution is sufficient for distinguishing the light emerging at the output of the capillaries from that coming from the walls thereof and/or their surrounding medium.

Abstract: The invention concerns a multiple capillary electrophoresis device comprising a plurality of juxtaposed capillaries, means for generating inside the capillaries an electric field ensuring electrophoretic migration, at least one source for emitting a beam dsigned to exite the molecules at the capillary output, means for detecting the fluorescence of the molecules excited by said beam. The invention also comprises means for generating another electric field, called confinement electric field, which is regularly distributed around said capillaries and which is substantially parallel thereto, said electric field confining the electrophoretic migration field and forcing the molecules to move substantially without divergence in the axis of said capillaries.