Hop extract

[Bt agent]

When using hop extract could someone recommend how ml should you use for a 5 gallon lot :ugeek:

 

[graysalchemy]

Are you talking about isomerised hop extract for increasing the bitternes or aroma hop oils?

If it is the isomerised hop extract be very careful. I used it on a beer and it turned out very bitter and quite synthetic. i found a guide somewhere on line which i used but for the life of me I cannot remember. I did however mellow in time to become oine of my best beers. :thumb:

 

[Bt agent]

That's the stuff, going to play it safe going to add 2ml at a time and try it as it goes in.

 

[graysalchemy]

If you wait until tomorrow I will have a look in my note book. If I don't respond PM me. :thumb:

 

[Bt agent]

Cheers :

 

[graysalchemy]

Right I have written down a figure in my book that 5ml increase the IBU of 55L of beer by 6.27 IBU's so I am guess the same amount in 1L would give 55 x 6.27 = 344.85 IBU so 1 ml / L would give 68.97 so in 23L that would give 2.99 IBU

So as a guide 1ml in 23L will give roughly 3 IBU of bitterness.

Unless I have got it completely wrong.

Sorry I haven't got anymore guidance than that. :? :?

 

[Hoppy]

Firstly we need to decide whether it is CO2 extract or Ethanol Extract.
CO2 is dark green. Ethanol is yellow.
CO2 is usually in the range of 30% AAcid (upto 50% for high alpha hops) you get 32-38% utilisation.
Ethanol extract is 22-55% AAcid with a 30-40% utilisation.
They both are usually standardised to 30% AA though.

Hope this helps

Regards
H

 

[Hoppy]

And...isomerised Hop extract is usually 40-60% iso-alpha. Missed that!

Regards
H

 

[graysalchemy]

Thats great but how does that equate to a dosage rate ie IBU's per ml of extract per L

 

[Hoppy]

My point is, we need to ascertain its strength, before you can do anything. Assuming 30%aa and 33% utilisation of hop extract, not isomerised.

1ml of 30% contains .3g of alpha .ie 300 BUs (300mg/ml), but this will only give 100BUs at 33% utilisation.

So in 23litres:
100BUs/23 litres gives 4.35 BUs/ml.

Regards

H

 

[graysalchemy]

Are I get your point now :thumb: :thumb:

 

[Hoppy]

Had to think about it though, I usually work backwards, so-to-speak!
I usually have to start with a beer spec and then come up with the recipe!

Extracts are usually made to customer specs in large breweries, depending on how it's handled, whether it's dosed through machine, (runnier), or added manually to the copper, bloody tar.
Also as mentioned Ethanol (clear yellow) can be added to the beer before packaging if they realise that they are a little out of spec and because its not isomerised doesn't get too harsh and also really helps head retention.
CO2 extract is like dark green tar, but contains all if the hop soluble matter and can therefore only be used in the kettle, but has all hop essentials.
Iso, Tetra and indeed hop oils as you allude to, are very synthetic tasting. You can spot beers a mile off if used a little too much.

Regards

H

 

[graysalchemy]

I used the ritchies one which may well have been tetra as it was awful for about 10 months now it is a rather good beer 12 months on wish i had more of it. :thumb:

 

[RobWalker]

oldbloke just had this same problem -

viewtopic.php?f=36&t=47440

 

Hi Guys,

Some advice required,

I've just got the ingredients together to make 5 gallon of "way to amarillo" , last batch was awesome but i wanted more hop flavour so have got 15ml of cascade aroma oil bought in ready.

when's best to add this and how much for a slightly hopper taste and fragrance (don't want to go more bitter so i assume its right at the last minute???)

thanks in advance for advice!!