Isohops

[hihosland]

Greetings brewer folk
Once was a dedicated grain brewer, complete with plate chiller, pressure cooker hop kettle, archimedes screw mash tun, 100lit boiler the whole damned thing:- multiple ffridges, yeast farm, autoclave, coolroom, keg manifold.
Great fun, and quite a few great brews.

Now older, busier, smaller property, and want the simplest fastest way to generate consistent beer.

Plan is to use pale liquid malt extract (boiled), some citrus flavoring, low temp lager yeast, and isohops.

Question?
How much isohops to 23 litres of unhopped wort to produce an IPA style of bitterness say 35 or higher?

best wishes
Davidh

 

[DJR]

Greetings brewer folk
Once was a dedicated grain brewer, complete with plate chiller, pressure cooker hop kettle, archimedes screw mash tun, 100lit boiler the whole damned thing:- multiple ffridges, yeast farm, autoclave, coolroom, keg manifold.
Great fun, and quite a few great brews.

Now older, busier, smaller property, and want the simplest fastest way to generate consistent beer.

Plan is to use pale liquid malt extract (boiled), some citrus flavoring, low temp lager yeast, and isohops.

Question?
How much isohops to 23 litres of unhopped wort to produce an IPA style of bitterness say 35 or higher?

best wishes
Davidh

Have you looked at this: http://www.barthhaasgroup.com/cmsdk/conten...ch=%22isohop%22 (first hit on google)

Says that for 5 IBU, 2.1g per 100L or 0.5g per 23L is needed. So for 35IBU you'd add 3.5g or so.

The page only recommends 60-90% maximum bitterness from just plain isohop - i think it would turn out a bit too bland to be honest, but you could always just dry hop it for an IPA.

 

[MHB]

1 IBU is 1mg/L (milligrams of isomerised alpha acid / litre of finished beer)
So to get your Iso addition in mills
Its just desired IBU X number of Litres
So in 23 L at 35 IBU you need 23 X 35 = 805 mg (0.805g)
As the solution is 30% w/v Iso Alpha
0.805/0.3 = 2.66 mL

Hop additions at -10 to -15 minutes for taste and flame out for aroma would all help but I would just do the extra 50 minutes of boiling and bitter with good hops to.

As DJR said an all Iso bittered beer can be pretty 2 dimensional.

MHB