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Abstract
When defatted soy milk was ultracentrifuged, 34kDa allergenic soybean protein Gly m Bd 30 К was more abundant in the precipitate than in the supernatant by an SDS-PAGE analysis. The addition of more than 10 тм of 2-mercaptoethanol (2-ME) to the soy milk resulted not only in further removal of the 34 kDa allergenic protein to the precipitate, but also in better recovery of conglycinin in the supernatant.
After a two-dimensional SDS-PAGE analysis (the first dimension, minus 2-ME; the second, plus 2-ME) of the precipitates, superimposition between the CBB-stained gel and the electroblotted membrane stained with a monoclonal antibody specific to Gly m Bd 30 К indicated that part of Gly m Bd 30 К was preferentially bound to the a’- and a-subunits of conglycinin, and that part of them had formed the dimer through a disulfide bond.
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