Several studies reported the inhibitory effects of
polyphenols on carbohydrates hydrolyzing
enzymes. These include the green tea polyphenols
that inhibit the activities of α-glucosidase and
sucrase (Hara and Honda, 1992), berry
polyphenols that inhibit the activity of α-
glucosidase and α-amylase (McDougall and
Stewart, 2005) and sweet potato polyphenols
which inhibit the activity of α-glucosidase (Matsui
et al., 2001).