Studies on the bioactivity of aqueous extract of pu-erh tea and its fractions: In vitro antioxidant activity and α-glycosidase inhibitory property, and their effect on postprandial hyperglycemia in diabetic mice

► Pu-erh extracts showed remarkable inhibition on α-glycosidase in vitro. ► EP exhibited potent inhibition on postprandial hyperglycemia in alloxan-induced diabetic mice. ► TP, TPS and Pro were supposed to be responsible for the bioactivities of pu-erh tea.