Figure 1.

The inhibitory effects of tea water extract (TWE) and tea pomace extract (TPE) of green, oolong, and black tea at a concentration of 2.5 mg/mL on rat small intestinal α-glucosidase activity. The α-glucosidase activity was determined by measuring p-nitrophenol released from pNPG at 404 nm. Results are expressed as mean ± SD from three independent experiments in triplicate. Different corresponding letters indicate significant differences at p < 0.05 by Duncan’s test. ^A−C The first letters in uppercase are different among the types of tea within same extraction method and ^a−c the second letters in lower-case indicate significant differences between TWE and TPE groups.