Abstract
Soybean casein fraction was factionated by gel filtration with Sephadex G100. From the effluent diagram of soybean casein fraction, several minor components were obtained with a main component.
One of them showed a single pattern by ultracentrifugal analysis, but it was found to be contaminated with RNA by column chromatography on DEAE-cellulose. From the result of purification by the repeated rechromatography, the purified component contained about 7% of RNA per protein. Therefore, it was considered to be a ribonucleoprotein.
Among other minor components, free ribonucleic acids, which seemed to have different molecular weights were also present, but their ratios of purine to pyrimidine and base compositions coincided well each other.
