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Palmer sier ( How To brew): "The specific rate of both activity and denaturing for beta amylase will depend on the particular malt and mashing conditions, but as an example, it has been shown that in typical brewery mashing conditions the initial level of beta-amylase activity was reduced by 75% after 30 min. at 149°F (65°C) and by 90% of its original activity after 60 min."