Isolation of a Diketopiperazine Derivative from the Soy-bean Meal Hydrolysates, Commercially Available as “AMINOSAN-EKI”

Abstract

A diketopiperazine derivative isolated from the soy-bean meal hydrolysates, AMINOSAN-EKI, has been proved as L-isoleucyl-L-valine anhydride by elemental analysis, melting point, and by paper chromatography. L-Isoleucyl-L-valine anhydride must be derived from the dipeptide produced by hydrolysis of the proteins.