Crude enzymatic extract from the acetone powder of fruits of five oliv
e varieties was prepared. The oxidases, polyphenol oxidase (PPO) and p
eroxidase (POD), in each variety were determined in order to identify
the varieties with the lowest rate of enzymatic browning. Among the va
rieties studied, ''San Francesco'' and ''Pasola' are browning-proof si
nce they have the lowest values of PPO and POD activities.