Table 1.

Half maximal inhibitory concentration (IC₅₀) of tea extracts on rat intestinal α-glucosidase activity.

	IC50 (mg/mL)
		Green Tea	Oolong Tea	Black Tea
Rat intestinal α-glucosidase	TWE	2.04 ± 0.31 C,cd	2.33 ± 0.25 B,b	2.73 ± 0.15 A,a
	TPE	1.95 ± 0.37 B,d	2.22 ± 0.52 A,bc	2.14 ± 0.21 AB,b−d

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–d the second letters in lower-case indicate significant differences among all samples. TWE: tea water extract, TPE: tea pomace extract.