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Old 04-04-2012, 09:35 PM   #11
afr0byte
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You could always make some wort and split it up equally amongst however many hop varieties you have + a commericial hop with a known AA%. Then you can compare the relative bitterness given a constant weight of each hop variety. In the end, it's all about the perceived bitterness more so than an actual IBU number.

 
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Old 04-04-2012, 10:58 PM   #12
sweetcell
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Quote:
Originally Posted by cheezydemon3 View Post
.....I am surprised the old "OK for aroma, DO NOT use for bittering" hasn't come out. it is impossible to calculate IBU's.
you can't determine with absolute certainty what the AA% is (unless you have it lab tested). you can, however, come up with a decent estimate. check out the speadsheet in my sig, it has AA% ranges for each hop variety. chances are good anything you grow will be within that range. so you might not know if your chinook is 10% or 14% but you can estimate it to be 12% and work with that. it'll get you in the ball-park. if you're a hop-head go heavier than the estimate indicates, if you're not into heavy bitterness/favor/aroma go lighter. done and done.

Quote:
Originally Posted by cheezydemon3 View Post
If you like exact specifications and obsessive notes, DON'T GROW HOPS.
true dat. well said. gotta be ready to roll with the surprises.

isn't brewing wonderful?
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Old 04-04-2012, 11:15 PM   #13
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Fresh (wet) hop ales are a Fall celebration up here. 5-6 times as much by weight is the zone.

My first year I made an All Hops ale. Wasn't enough of anything to make more than one batch. Since 50% of the harvest was from Cascade, it was a Pale.

Hint: keep some back for 'dry' hopping. Stick them in your freezer in a bag and add them a couple days before bottling. There are very light oils that would be driven off by the drying process. They make the aroma special.
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Old 04-04-2012, 11:18 PM   #14
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Sweetcell.. Thanks for the comparison table!

David 42, so just to make sure I understand... You're freezing "wet" hops for "dry" hoping? The freezing doesn't turn them to mush??
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Old 04-05-2012, 03:52 AM   #15
Beardsly
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Awesome. You guys kick ass.

 
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Old 04-05-2012, 01:04 PM   #16
jagec
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Quote:
Originally Posted by cheezydemon3 View Post
.....I am surprised the old "OK for aroma, DO NOT use for bittering" hasn't come out. it is impossible to calculate IBU's.
Not true if you have a spec and some run-of-the-mill solvents.

 
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Old 04-05-2012, 02:13 PM   #17
Beardsly
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Tell me more about these solvents, because I might have access to a spectrometer due to my occupation as a biology student.

Got a method?

 
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Old 04-06-2012, 02:32 PM   #18
jagec
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Quote:
Originally Posted by Beardsly View Post
Tell me more about these solvents, because I might have access to a spectrometer due to my occupation as a biology student.

Got a method?
Alpha and Beta Acids in Hops
(reference: ASBC MoA. 8th edition, 1992)
Method
1. Place 5.000 +/- .001 gr pulverized hops in an extraction bottle and add 100 mL toluene.
2. Shake for 30 min with vigorous agitation.
3. Let stand until clear or centrifuge (preferred).
4. Dilution A: Dilute 5.0 ml of this extract to 100 mL with methanol.
5. Dilution B: Dilute an aliquot of the dilution A with alkaline methanol (0.2 mL 6M NaOH per 100 mL MeOH) so that the Abs at 325 and 355 falls within the most accurate range of the instrument (usually between 0.1 and 1)
6. Immediately read dilution B (1 cm) at 275, 325 and 355 vs a toluene blank that was prepared and diluted in EXACTLY the same manner.
Notes:
? Hexane may be substituted for toluene
Calculations:
Dilution factor, d= (volume dil A x volume dil B)/ (500 x aliq extract A x aliq dil A)
% alpha acids= d x (-51.56 A355+ 73.79 A325-19.07 A275)
% beta acids= d x (55.57 A355-47.59 A325 + 5.10 A275)
Example:
1. 5 gr hops extracted with 10 mL toluene
2. 5 mL clear extract diluted to 100 mL with methanol=Dilution A
3. 3 mL Dilution A diluted to 50 mL with alkaline methanol
4. Absorbances
o A355=0.615
o A325= 0.596
o A275=0.132
d = (100 x 50) / (500 x 5 x 3) = 0.667
alpha = 0.667 x [ -(51.56 x 0.615) + (73.79 x 0.596) - (19.07 x 0.132) = 6.5
beta = 0.667 x [ (55.57 x 0.615) - (47.59 x 0.596) + (5.10 x 0.132) = 4.3

 
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Old 04-07-2012, 05:51 AM   #19
Beardsly
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Jagec you are wonderful. That's going in my brew reference book once I get my typewriter working again.

 
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Old 04-18-2012, 01:07 PM   #20
smackett
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If you plan on storing them they should be dried. I did this with a dehydrator on the lowest setting. Worked great and trasted great.

 
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