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Home Brew Forums > Home Brewing Beer > All Grain & Partial Mash Brewing > Shoot -- mashed hot, screwed? Also, iodine = sugar or fermentable sugar?




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Old 10-10-2009, 08:25 PM   #1
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Default Shoot -- mashed hot, screwed? Also, iodine = sugar or fermentable sugar?

OK, doing my first AG BIAB today, and I mashed hot. (Didn't account for rise time and temp equilibration after dumping in grain, so I hit it with more heat, when I checked at the 30 minute mark I was at 160)

Is 160 too hot? If so, this means I won't get as much fermentable sugar, right?

Iodine test at 50 minutes is good, but does iodine test for starches into sugars, or starches into FERMENTABLE sugars??

Thanks!!!
Keith



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Old 10-10-2009, 08:28 PM   #2
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160 is pretty hot, but not so much that your mash is ineffective. Don't be surprised, though, if your beer finishes at a high SG with lots of body and residual sweetness.

Lack of color change in an iodine test indicates lack of starch, NOT presence of sugar (or fermentable sugar, for that matter).



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Old 10-10-2009, 08:41 PM   #3
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Thanks Yuri....I figured I'd get body and sweetness....It's a version of Orfy's Mild....1.037 target OG, so we'll see how much of that gets eaten.....as long as I get more than 1% ABV I'm OK.....body and sweet is what it should have anyway, right??

So if the iodine doesn't change color, it means no more starch....doesn't that mean it HAS to be sugar? What else could the starch turn into??

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Old 10-10-2009, 08:58 PM   #4
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Yes, in a mash, an iodine test with no color change is a positive indication that the starch has all been converted to sugar (fermentable or otherwise). In a broader sense, a lack of iodine color change in any given solution does not necessarily prove that sugar is present.

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Old 10-10-2009, 09:04 PM   #5
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Gotcha. Thanks again....coming up on hot break now, at least it SMELLS good!

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Old 10-10-2009, 09:43 PM   #6
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I wouldn't be overly worried about it...just remember to check the temps better next time. As was said above, you'll probably end up with a big, full bodied beer that ends fermentation somewhere above 1.015.

cheers

~r~

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Old 10-10-2009, 11:16 PM   #7
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Quote:
Originally Posted by shortyjacobs View Post
O
Iodine test at 50 minutes is good, but does iodine test for starches into sugars, or starches into FERMENTABLE sugars?
technically, the iodine reaction stops once an unbranched chain is shorter than 9 glucose units. It can be longer for branched chains. http://braukaiser.com/wiki/index.php?title=Carbohydrates#Reaction_with_iodine

But there will be fermentable sugars in the wort. I suggest you do a fast ferment test to derdermine the fermentability of the wort as it will be higher than what you would normally expect.http://braukaiser.com/wiki/index.php?title=Fast_Ferment_Test
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Old 10-11-2009, 02:31 AM   #8
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Quote:
Originally Posted by Kaiser View Post
technically, the iodine reaction stops once an unbranched chain is shorter than 9 glucose units. It can be longer for branched chains. http://braukaiser.com/wiki/index.php?title=Carbohydrates#Reaction_with_iodine

But there will be fermentable sugars in the wort. I suggest you do a fast ferment test to derdermine the fermentability of the wort as it will be higher than what you would normally expect.http://braukaiser.com/wiki/index.php?title=Fast_Ferment_Test
That's great Kai, thanks for the info!

The wort is already pitched and off, unfortunately, so no fast ferment test this time, but I love the idea. I'll definitely do it in the future to learn more about how my beers are mashing/fermenting!


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