BioRad Prep Cell uses cylindrical gel for continuous-elution preparative electrophoresis. Fractions, migrating through the gel as ring-shaped bands, are collected from the elution chamber at the bottom of the gel via elution tube by peristaltic pump. Band's substances are drawn to the fractions collector in an elution buffer. Any buffer system (denaturizing or not), gel material (acrylamide of agarose) and percentage can be used for efficient separation and/or purification of proteins, nucleic acids or other biomolecules. For more information visit