Figure 2

Comparison of pH activity and stability between free CotA and NS-CotA. (a) Optimum pH. The graphic shows the ABTS-oxidizing activity of free (open circles) and immobilized (closed circles) CotA at pH ranging from 3 to 8. (b) pH stability. Residual activity (%) of free CotA and NS-CotA after incubation at different pH values (3 to 8).