Table 2.

Half maximal inhibitory concentration (IC₅₀) of tea water extract (TWE) and tea pomace extract (TPE) on rat small intestinal sucrase, maltase, and glucoamylase activity

		IC50 (mg/mL)
		Green Tea	Oolong Tea	Black Tea
Sucrase	TWE	0.16 ± 0.01 C,c	0.19 ± 0.01 B,b	0.31 ± 0.04 A,a
	TPE	0.13 ± 0.01 C,d	0.16 ± 0.01 B,c	0.19 ± 0.01 A,b
Maltase	TWE	0.22 ± 0.01 B,d	0.22 ± 0.01 B,d	0.37 ± 0.03 A,a
	TPE	0.22 ± 0.01 C,d	0.26 ± 0.01 B,c	0.35 ± 0.03 A,b
Glucoamylase	TWE	0.22 ± 0.01 B,b	0.23 ± 0.01 B,b	0.37 ± 0.05 A,a
	TPE	0.24 ± 0.02 B,b	0.25 ± 0.01 B,b	0.38 ± 0.01 A,a

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 teas within same extraction method and ^a−d the second letters in lowercase indicate significant differences among all samples.