CE activity measured with p-NPA and p-NPB did not show
any initial inhibition after 48 h exposure. During the following recovery days, activities remained almost constant and no statistically
significant differences were observed with respect to
the controls (CE p-NPA: Kruskal-Wallis; H = 5.51; CE p-NPB:
Kruskal–Wallis; H = 1.61; P > 0.05) (Fig. 2a,b)