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Mash Starches

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Vadim Kotlyar - Hartford, Connecticut asks,
Q

Do starches quickly become solubilized or do they remain trapped in the grist when the strike water is added? This question is regarding how a recirculating system behaves and whether there would be any effect if the recirculating wort were being heated above a desired mash temperature when passed through a heat exchanger. Are the starches and their breakdown products mostly in solution along with the enzymes, or are they still in the grist solids for most of the mash time?

A
Mr. Wizard analyzes what happens to starches in the mash tun & more.
Response by Ashton Lewis.