The Heterogeneity of Lactoperoxidase.

Abstract
LactoperoxTdase from cow''s milk was separated into several fractions by chromatography on diethylaminoethyl-Sephadex. The heterogeneity pattern was found to be the same all through the year. All fractions were enzymically active. The main fractions (1 and 2), probably corresponding to lactoperoxidase A and B described by Polis and Schmukler, have the same extinction coefficients at 280 m[mu] but differ in this respect at 412 m[mu]. The iron-content and specific activities, based on the absorption at 280 m[mu], were the same. Lactoperoxidase prepared from a single cow was also heterogeneous.