Corn Mash

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Corn Mash

Postby toadskin » Wed Jan 16, 2019 10:45 am

I've had a try at doing a corn mash with what I could buy locally. So I started with 5Kg of gristed maize in 25 litre of water, and gave it a good 45 minutes of rolling boil. The iodine test showed heaps of starch. I added 8 grams of alpha amalyse at the recommended temperature and gave it a good stir every 5 minutes or so for about 90 minutes. I let it settle overnight and the sg came out at 1.040. It has a sweet taste and the iodine test shows little or no starch in solution.

Question....what sort of sg should I have obtained with the quantities I have used? Is 1.040 in the ball park?

I figure now I will add 4 - 6kg of sugar, top it up to 25 litres and aim for an sg of 1.110

Any advice appreciated.
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Re: Corn Mash

Postby hillzabilly » Wed Jan 16, 2019 11:56 am

Try reading viewtopic.php?f=47&t=1837 cheers hillzabilly ;-)
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Re: Corn Mash

Postby RC Al » Wed Jan 16, 2019 12:18 pm

Sg 1.110 - what yeast do you want to throw at that?

Opinion here, but if you use sugar, you may as well not used the enzyme at all, taste over quantity, the sugar adds it's own burn to the flavor
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Re: Corn Mash

Postby Georgio » Wed Jan 16, 2019 12:47 pm

:text-+1: Minimise the sugar addition
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Re: Corn Mash

Postby toadskin » Wed Jan 16, 2019 1:06 pm

I intend to use Lowans. So you suggest I reduce the sugar back to say 3kg perhaps? Is 1.040 what I should have got out of the maize?
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Re: Corn Mash

Postby bluc » Wed Jan 16, 2019 1:07 pm

you have a 1 to 5 final volume mash thickness there, with barley I aim for 1 to 4 mash final thickness. On 1 to 4 a good conversion should end up at 1.063 ish( i seem to only hit 1.053) Just punched the numbers into beersmith and came up with 1.046 so you did pretty well. Next time rather than adding sugar bump the corn to 6.5kg see how you go that should get you 1.060, touch over 1 to 4 which will give you a great taste.. :handgestures-thumbupleft:
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Re: Corn Mash

Postby toadskin » Wed Jan 16, 2019 1:57 pm

Thanks Bluc. So at least I'm in the game with that. I'll try the 1:4 next batch.
Last edited by toadskin on Wed Jan 16, 2019 1:58 pm, edited 1 time in total.
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Re: Corn Mash

Postby bluc » Wed Jan 16, 2019 3:01 pm

Where did you get your enzyme from? If you don't mind me asking.. :handgestures-thumbupleft:
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Re: Corn Mash

Postby ultrasuede » Wed Jan 16, 2019 5:22 pm

Careful with the corn mate. Corn that you buy from rural supply stores is modified to have more protein than starch, leading to horrible sugar yeilds.
Our only options in Aus are the stuff you get from homebrew shops for $1m a kg, or a cheap source of bulk popping corn, which has almost a 100% usable starch content.

I may have found bulk popcorn for $1.50 per kg in Brissie which is nice.
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Re: Corn Mash

Postby ultrasuede » Wed Jan 16, 2019 5:28 pm

bluc wrote:Where did you get your enzyme from? If you don't mind me asking.. :handgestures-thumbupleft:


Hey Bluc, ibrew has some liquid enzymes that I've had success with. They have DeltaMalt which has your alpha amylase and beta gluconase.
They also do Amylo 300 and 400.
I'm yet to find an enzyme in Australia that has beta amylase.
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Re: Corn Mash

Postby bluc » Wed Jan 16, 2019 6:19 pm

Thanks ultrasuede any hints about the popcorn? Do you pop it before using..
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Re: Corn Mash

Postby bluc » Wed Jan 16, 2019 6:26 pm

Can yoj mash without beta enzyme? Do you know anything about the grits sold by kegland?
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Re: Corn Mash

Postby ultrasuede » Wed Jan 16, 2019 6:32 pm

You have to crush it in a grain mill, then boil it. I usually add enzyme before boiling just to liquefy the starches to make the boil easier. Then after boiling, cool to mashing temp and add mashing enzymes
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Re: Corn Mash

Postby ultrasuede » Wed Jan 16, 2019 6:35 pm

Beta enzyme converts the trisaccarides and disaccharides to monosaccharides which are easier to ferment. If you just rely on the alpha amylase, you will be stuck with a bunch of maltose, which is hard for yeast to process, and will usually result in a stuck ferment.

It's been a while since I studied sugar, so I may have messed up some terminology there.
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Re: Corn Mash

Postby wynnum1 » Thu Jan 17, 2019 5:50 am

Dextrose is made from corn could add dextrose and use the corn for flavor.When they make corn flakes they steam the corn that could be another option to boiling but they do for a fairly long time.
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Re: Corn Mash

Postby bluc » Thu Jan 17, 2019 12:08 pm

Flaked corn doesn't need to be boiled. Someone said using pop corn and popping it = gelatinization. As soon as I work out a way to pop 10kg will be all over it..
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Re: Corn Mash

Postby scythe » Thu Jan 17, 2019 2:04 pm

Buy one of those poppers they have at the movies...
Should knock 10kg out in an hr or 2... maybe... NFI how quick they actually work.
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Re: Corn Mash

Postby bluc » Thu Jan 17, 2019 2:26 pm

Have been considering it but not sure if they oil free. Thinking of getting half dozen of those air poppers from target.. :twisted:
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Re: Corn Mash

Postby hillzabilly » Thu Jan 17, 2019 2:34 pm

Maybe a hire job https://popcornman.com.au/our-amazing-p ... -a-reason/ .cheers hillzabilly ;-)
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Re: Corn Mash

Postby RC Al » Thu Jan 17, 2019 2:43 pm

Know anyone with a smoker or Webber? (Not me, sorry)

Hmmm what flavors to add in with the smoker....

Kinda exciting concept... :think:
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