Abstract
The preparation of second-cycle casein-fraction S-from skim milk has been described in Part I of this series (McKenzie and Wake 1959a) and by Waugh and von Hippel (1956). This fraction contains mainly x-casein, as, well as f1- and y-casein, and a number of minor components. In the present communication a method is described for the separation and purification of the K-casein. Some observations on its chemical and physical properties are also included.

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