Hydroxyapatite (HAp-CHT TypeII 40 mm) was coated with a stable layer of polyethylenimine (PEI). The resulting material was useful in column chromatography of acidic materials. A mixture of AMP, ADP, ATP, and adenosine could be resolved readily. The convenient separation of ovalbumin (one of the phosphoproteins) from other standard protein mixtures was observed.
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