The activity of an enzyme is heavily dependent on the optimal
pH for enzyme function. Fig. 3 shows that the soluble enzyme had
little activity at pH 6.5 or below, moderate activity at pH 7 and near
optimal activity from pH 7.5 to pH 10. Immobilization changed
the pH profile. The immobilized enzyme had significant activity
even at pH 4, and had progressively higher activity with increasing pH