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In a centrifuge attachment for use in counter current chromatography, a centrifuge plate rotatable about a central axis carries either two or more convoluted (e.g. straight helical) coils or a single convoluted coil arranged as a toroid, the tube or tubes being convoluted about an axis of convolutio

In a centrifuge attachment for use in counter current chromatography, a centrifuge plate rotatable about a central axis carries either two or more convoluted (e.g. straight helical) coils or a single convoluted coil arranged as a toroid, the tube or tubes being convoluted about an axis of convolution which is generally perpendicular to the local direction of the centrifugal force generated by rotation of the plate. Inlet and outlet tubes are provided in a known manner such that they do not twist and the convulated coil is rotated about its axis of convolution at a speed which is independent of the speed of rotation of the centrifuge plate.

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A centrifuge comprising a centrifuge plate fixed to a hollow central shaft; first rotation means to rotate the hollow central shaft whereby the centrifuge plate rotates about a central axis; a support tube which passes through the hollow central shaft; second rotation means to rotate the support tub

A centrifuge comprising a centrifuge plate fixed to a hollow central shaft; first rotation means to rotate the hollow central shaft whereby the centrifuge plate rotates about a central axis; a support tube which passes through the hollow central shaft; second rotation means to rotate the support tube at a speed which differs slightly from the speed of rotation of the hollow central shaft; support means for supporting on the centrifuge plate at least one convoluted tube near the periphery of the plate, the tube being convoluted about an axis of convolution which is generally perpendicular to the local direction of the centrifugal force generated by rotation of the centrifuge plate; connection means between the support tube and the at least one convoluted tube whereby the at least one convoluted tube is rotated about an axis parallel to the axis of convolution during rotation of the centrifuge plate and at a predetermined speed which is independent of said rotation; and means for supplying inlet and outlet tubes to the at least one convoluted tube in a twist free manner, the inlet and outlet tubes passing through the support tube; and drive means connected to the first and second rotation means.