Table 4.

Half maximal inhibitory concentration (IC₅₀) of tea water extract (TWE) and tea pomace extract (TPE) of green, oolong, and black tea on the DPPH radical scavenging activity.

		IC50 (µg/mL)
		Green	Oolong	Black
DPPH	TWE	15.33 ± 2.61 B,b	16.14 ± 1.25 B,b	20.57 ± 0.78 A,a
	TPE	9.21 ± 1.86 B,c	16.06 ± 1.17 B,b	18.05 ± 0.50 A,a

Different corresponding letters indicate significant differences at p < 0.05 by Duncan’s test. ^A,B The first letters in uppercase are different among types of tea within the same extraction method and ^a−c the second letters in lowercase indicate significant differences among all samples.