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Old 02-02-2011, 05:57 PM   #1
brewzombie
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Default Partial Mash Beta-Glucan Rest?

I'm doing a partial mash for a Rye IPA with 45% Rye Malt and 9% Flaked Wheat. Do I need a beta-glucanases/cytase rest to stop it from gumming up? I tried a similar mash awhile back and it was a disaster, even with batch sparging. I've thinned out the mash somewhat and added rice hulls, but I still think I might need a beta-glucanase/cytase rest of 20 minutes at 40 C (104 F). I've never done one before.

Anyone have experience with this?

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Old 02-02-2011, 06:11 PM   #2
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When using large amounts of wheat I'll do a beta glucan rest. I think 10 minutes is usually long enough, IIRC. It'll turn from oatmeal into a "normal" mash. How long that'll take may vary. No experience with rye.

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Old 02-02-2011, 07:41 PM   #3
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Quote:
Originally Posted by Nateo View Post
When using large amounts of wheat I'll do a beta glucan rest. I think 10 minutes is usually long enough, IIRC. It'll turn from oatmeal into a "normal" mash. How long that'll take may vary. No experience with rye.
There's ~27% crystal malts in the mash too, so I figure I may need the longer rest for the enzymes to work. Not sure though. Maybe I'll aim for 15 min.

Anyone have experience with rye malt and BG-rests? Even though the rye is malted it seems to turn gummy. Maybe a protein rest is more appropriate, but I don't want to reduce head retention.
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Old 02-03-2011, 01:40 AM   #4
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I did 15-20 min at 44 C. The sparge was easy peasy. Not sure it was necessary, but no stuck sparge.

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