Abstract
A new derivative of riboflavin, prepared by incubation of riboflavin with an enzyme obtained from rat liver, is described. The elementary composition of the substance is C23H30O11N4; it has been identified as 5[image]-D-riboflavin-D-glucopyranoside (riboflavinyl glucoside). It is suggested that the glucosidic linkage has the alpha-configuration. Preliminary investigations of the enzymic reaction indicate that the enzyme catalyzes a transglycosidation of D-glucose from maltose or glycogen to riboflavin.
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