Fig 3. Effect of pH on specific oxidative enzyme activity (nmol mL^-1s^-1) of enzyme extracts from the larvae of T. molitor (A), A. diaperinus (B) and H. illucens (C).

L-DOPA (red), L-DOPA+H₂O₂ (orange), L-dopamine (light blue), L-tyrosine (green) or ABTS (purple) were used as substrates and buffer (dark blue) as negative control (n = 2, error bars represent absolute deviation).