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Abstract
Cell separation using aqueous polymeric two-phase systems is well established. For separations of cells having similar partition coefficients a multistep countercurrent distribution procedure has to be used. However, its operation is limited by time and apparatus constraints. As an alternative strategy we have developed a chromatographic technique in which the dextran-rich phase of a dextran/polyethylene glycol (PEG) phase system is immobilized onto derivatized agarose beads. The PEG-rich phase is used as the eluent. Inclusion of PEG-fatty acid affinity ligand gradients into the eluent produces separations of mammalian erythrocytes based on the differential interaction between the fatty acid and the erythrocyte membranes. A model separation of dog and human erythrocytes has been carried out.
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