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Why doesn't mash heating denature amylase enzymes ?

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Cool thread.

I've always wondered the effect of heating strike water to ~167-170 and then dumping in 12-16lbs of grain and stirring pretty quick to equalize temps at ~152-156.

I always figured that some of those initial grains enzymes may be toast, but also just assumed it was statistically insignificant at the homebrew scale.
 
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