Occurrence in Soybeans of a Novel Vitamin B₆ Conjugate that Liberates Pyridoxine by β-Glucosidase Action after Alkali Treatment

抄録

  A type of vitamin B₆ conjugates (B₆X), which liberates free vitamin B₆ by alkaline and successive β-glucosidase hydrolyses, is known to occur in rice bran and wheat bran. Conflicting experimental results, however, have been reported about the occurrence of B₆X in soybeans. This study afforded evidence for B₆X occuring in soybeans: certainly a highly purified B₆X preparation from whole soybeans liberated pyridoxine when it was treated with alkali followed by β-glucosidase hydrolysis, and 5′-O-(β-D-glucopyranosyl)pyridoxine by alkali treatment alone. The B₆X content varied with cultivars, of which a certain kind contained no B₆X.