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phosphate gel, and three kinds of N-terminal amino acids (glycinine, phenylalanine and leucine or isoleucine) have been seen in the 11S ,component. More detailed studies6) by the ultracentrifugation have suggested that the 11S component is capable of dissociating into subunits in the presence of urea and detergent. By starch-gel electrophoresis using 0.076M tris-citrate buffer (pH 8.6) containing 0.02M mercaptoethanol and none or 7M urea in the sample solution and the gel medium, respec tively, it has been revealed that water-extracted proteins consist of components corresponding to the bands A to E in no-urea system or the bands 1 to 13 in urea system, of which the com ponents corresponding to bands C and D or 7 to 10 are major parts, respectively (Fig. 1).7) It has been observed that CIF (cold-insolu ble fraction), which precipitated during cool ing a concentrated aqueous extract of defatted soybean meal, contains more prominent com ponent corresponding to the band C in no-urea system or the bands 7 to 9 in urea system (Fig. 1).7) The present communication deals with the fractionations of CIF by column chromato-

Fractionation of Soybean Proteins by Column Chromatography on DEAE-Cellulose