Figure 4.

Comparison of DPPH radical scavenging activities and total phenolic content of tea water extract (TWE) and tea pomace extract (TPE) of green, oolong, and black tea at concentration 5.0 µg/mL concentration, The absorbance was measured at 517 nm for DPPH, and at 725 nm for total phenolic content. The results were expressed as mean ± S.D with three independent experiments in triplicate. 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−e the second letters in lowercase indicate significant differences among all samples.