from 14 flavonoids tested , the flavones quercetin and fisetin were found to be efficient inhibitors of nonactivated phosphorylase kinase when assayed at ph 8.2 , causing 50 % inhibition at a concentration of about 50 microm , while the flavanone hesperetin stimulated phosphorylase kinase activity about 2-fold when tested at 250 microm .
C0596577
flavonoids
C0016219
flavones