1.8.4.2 6.2 8.4 - 394856 1.8.4.2 6.2 10.2 pH 6.2: about 10% of activity maximum, pH 10.2: about 20% of activity maximum 394848 1.8.4.2 6.5 - reaction is negligible 762613 1.8.4.2 6.5 8.5 - 394825