A procedure for the purification of isoenzyme I of phospholipase C from Cl. perfringens was developed. The isoenzyme was purified to homogeneity (data from disc electrophoresis) using affinity chromatography on polycephamide and gel filtration through Ultrogel AcA-54, the enzyme yield being 41%. Some properties of the purified isoenzyme I (pH and temperature optima, stability, effect of metal ions and detergents, substrate dependence) were investigated. No significant differences between the properties of the unfractionated enzyme and isoenzyme I were established.
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