2.7.2.7 6.5 7.8 pH 6.5: about 60% of maximal activity pH 7.8: about 65% of maximal activity 642343 2.7.2.7 5 9 the enzyme demonstrates negligible activity below pH 5.0, while activity gradually decreased under conditions exceeding pH 8.0, maintaining about 60% of maximum activity at pH 9.0 761102 2.7.2.7 6 10 pH 6: about 25% of maximal activity, pH 10.0: about 50% of maximal activity 642344