Malted barley as alpha amylase

[Nooor]

For 1 gallon water and 1 lb crushed corn how much malted barley to apply to convert the sugars completely

 

[AdjunctBrewer]

Depends on the type of malted barley and it's associated Lintner or diastatic power.

A barley malt (Pilsner) with 120 degrees Lintner the bare minimum would be 0.33 lbs.

A barley malt (Six Row) with 180 degrees Lintner the bare minimum would be 0.23 lbs.

A barley malt (Munich) with 60-70 degrees Lintner the bare minimum would be 0.75 lbs.

You'll want to use more than the bare minimum amount of barley malt, say (2X) so the conversion occurs in a reasonable period of time.

You'll also want to consider doing a cereal mash to gelatanize the starches in the crushed corn.

Starch conversion isn't necessarily a 1:1 process (might need more/less time, with more/less barley/corn, etc...)

An iodine test is useful to determine if there are any starches remaining.

 

[Bobby_M]

While the minimums listed above will get it done, more malt will get it done faster.