Aqueous two-phase partitioning has been elaborated in order to improve the purification of alkaline phosphatase from calf intestine in larger scale. The laborious precipitation and centrifugation steps for the removal of the enzyme from the cell debris and from the bulk protein were replaced by this technique yielding a high recovery (88%) and a significant lower time requirement. For the preparation of 100.000 units (46 mg) of a homogeneous enzyme 2.0 kg of a system containing 200 g PEG 4000 and only 10 g dextran M 70 is necessary. Affinity partitioning in aqueous two-phase systems was used to screen 41 dyes for selecting a suitable ligand for the dye-ligand chromatography of the enzyme. In the case of alkaline phosphatase the results obtained by affinity partitioning coincide with the experimental requirements for the affinity chromatography of the enzyme. Procion Navy HE-R (Blue 171) exhibits a high affinity, selectivity and binding capacity for the enzyme compared with other dyes investigated. The purification procedure provided the same degree in purity (2200 U/mg) and yield (59%) if mucosa or chyme was applied as starting material. In the range of practical use the purified enzyme contains no detectable activities of DNAses (endonucleases) and DNA-nicking activities. The contamination with phosphodiesterase I (EC. 3.1.4.1.) is less than 0.01%.
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