The absorbance was then measured at 405
nm and the corresponding total protein was determined
and used to normalize the absorbance. The tyrosinase
activity was determined based on the amount of DOPA
chrome produced in response to the use of various substrates,
including L-tyrosine and L-DOPA. To assess this,
100 μL of supernatants and 100 μL of 12.5 mM L-DOPA
were then mixed and incubated at 37o
C for 30 min. The
absorbance was then measured at 475 nm and the corresponding
total protein was determined and used to normalize
the absorbance.