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The chemical forms of manganese compounds in soybeans were studied. About 55% of the total manganese in soybeans was extracted into the aqueous supernatant. Separation of the aqueous supernatant by gel chromatography revealed that the ligand-binding manganese localized in three molecular weight fractions (> 100, 000, about 60, 000, and < 1, 000). The largest molecular weight manganese-binding compound consisted of protein, calcium, and phosphorus compound-binding manganese. Phosphorus compound-binding manganese easily dissociated from the macromolecule by gel chromatography. Manganese in the 60, 000 molecular weight fraction tightly bound to protein. This bond was affected neither by 2-mercaptoethanol, by sodium dodecyl sulfate, nor by EDTA. The lowest molecular weight ligand-binding manganese did not bind to DEAE-Sephadex A-25 resin.

Distribution of molecular weight and chemical form of manganese compounds in soybeans.