Galactosyl maltooligosaccharide derivatives

摘要

Galactosyl maltooligosaccharide derivatives represented by formula (1): <IMAGE> wherein at least one of X1 and X2 represents a galactosyl group and the other represents a hydrogen atom, R represents a hydrogen atom or a substituted or unsubstituted phenyl group, and n is an integer of from 2 to 5. The derivatives are prepared by reacting a sugar with a galactosyl group with a maltooligosaccharide represented by formula (2): <IMAGE> R represents a hydrogen atom or a substituted or unsubstituted phenyl group, and n is an integer of from 2 to 5; in the presence of alpha -galactosidase or beta -galactosidase. The derivatives are used for measurement of alpha -amylase activity.