So the important factors involved in enzymatic
browning are (i) the phenolics concentration, (ii) the PPO activity
and (iii) other factors such as L-ascorbic acid (L-AA is able to convert
o-quinones back to diphenols) and peroxidases (which react
also with phenolics using H2O2 as co-substrate) (Toivonen &
Brummell, 2008).