Abstract: Emerging solutes from a preparative gel electrophoresis column are drawn into a narrow transfer tube through a collar which fits over the column end and secures a porous plate and dialysis membrane to the column end. The collar is provided with a series of channels running from the collar exterior to a series of locations on its interior wall based around the periphery of the porous plate. An external pump draws lower buffer solution into these channels and laterally through the porous plate to essentially located withdrawal tubing. The solutes emerging from the tubing are then directed to a fraction collector.