Fig. 6.

Tyrosinase inhibitory activities of formulation containing 5% tannase-converted green tea extract. Tyrosinase inhibition activity (%) = [(A − B) − (C − D)]/(A − B) × 100. (A) With tyrosinase but without sample; (B) without sample and tyrosinase; (C) with sample and tyrosinase; and (D) with sample but without tyrosinase. Bars are means ± standard deviation of three determinations. Asterisks indicate significant differences (p < 0.05) among samples by Turkey multiple range test. FNGE, formulation containing 5% normal green tea extract; FTGE, formulation containing 5% tannase-converted green tea extract.