Modification of succinylated .ALPHA.sl-casein with papain: Covalent attachment of L-norleucine dodecyl ester and its consequence.

protein and thus maximize its surface-active function. The so-called •gone-step process"1 •`4) was applied for this purpose. Succinylated ƒ¿s)-casein,5,6) ca. 25,000 dal tons, was used as a hydrophilic substrate; its homogeneity was confirmed by SDSpolyacrylamide gel electrophoresis.7) LNorleucine 1-13C-dodecyl ester, prepared from K13CN and 1-bromoundecane through four steps,8•`10) was used as a lipophilic nucleo