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The digestibility of proteins in red kidney bean (Phaseolus vulgaris L.) was examined by in vitro pepsin assay. A 20-kDa polypeptide that remained highly stable after heat processing was identified as a basic subunit of legumin. The results of a monobromobimane (mBBr) labeling test implied that this protein contained rigid intramolecular disulfide bonds, which might contribute to pepsin resistance.
M. Momma (Sat,) studied this question.