Transfer of apiose from UDP-apiose to 7-O-(beta-D-glucosyl)-apigenin and 7-O-(beta-D-glucosyl)-chrysoeriol with an enzyme preparation from parsley

An enzyme preparation from parsley (Petroselinum hortense Hoffm.) catalyses the formation of apiin (7-O-beta-D-apio-furanosyl(1-->2)beta-D-glycosyl]-5,7,4'-trihydroxyflavone) from 7-O-(beta-D-glycosyl)-apigenin and UDP-apiose and of the corresponding chrysoeriol-7-apiosyl-glucoside from 7-O(beta-D-glucosyl)-chrysoeriol and UDP-apiose. Neither free apiose nor cyclic apiose-1,2-phosphate can function as a substrate for the transfer reaction.