Tyrosinase is a copper-containing monooxygenase (Yu, Hung,Weng, Su, & Wang, 2006). Cu+2 reducing power of mulberry fruit extract was monitored by the maximum absorbance of the red
complex of Cu+1 and bathocuprinedisulfonic acid at a wavelength of 483 nm. As shown in Table 2, more Cu+2 reducing power exhibited in purple-colored mulberry fruit extract. Stronger Cu+2 reducing power in purple-colored mulberry fruit extract may imply that it exhibited a higher anti-tyrosinase activity which is similar to the results in Fig. 3