With respect to phenolic compounds, according to Table 1, the enzymatically
treated juice showed a decrease in these compounds content.
This can be associated to the conditions to which the juice was
subjected during the enzymatic treatment (45 °C for 30 min), which
may have caused some degradation. However, this trend was not observed
for the antioxidant activity. An increase in the phenolic content
was noticed in the retentate, together with an increase in the
antioxidant capacity of this fraction, indicating the importance of
those compounds as antioxidant agents in the apple juice. Results
also show that the clarified juice presents phenolic content and antioxidant
activity similar to the hydrolyzed pulp. For this reason, this
fraction can still be considered an interesting feed for a subsequent
concentration processes.