« on: July 29, 2016, 03:33:24 PM »
Awesome, thanks so much!!!
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I got an anova circulator last year when they were doing their great sell off of the previous model and I love the damn thing. It's much better and more reliable than anything I could cobble together on my own.
What in particular are you looking for? I can say right now - get one and grab both the chef steps and anova apps for the phones because they give you a ton of guidance.
Paraphrasing from Fundamentals of Beer and Hop Chemistry (text below), 2/3 of the hop bitterness in wort has a half-life in excess of 5 years, and the remaining 1/3 as a half-life of 1 year. From that, I've made a table showing the amount remaining over time. The total column shows the percentage of bitterness compared to the total at the start:
months cis- trans- total
0 68.00% 32.00% 100.00%
3 65.68% 26.91% 92.59%
6 63.45% 22.63% 86.07%
9 61.29% 19.03% 80.31%
12 59.20% 16.00% 75.20%
15 57.18% 13.45% 70.64%
18 55.23% 11.31% 66.55%
21 53.35% 9.51% 62.87%
24 51.53% 8.00% 59.53%
30 48.08% 5.66% 53.74%
36 44.86% 4.00% 48.86%
48 39.06% 2.00% 41.06%
60 34.00% 1.00% 35.00%
So, if you leave a beer for 1 year, it's IBUs will have decreased to 75% of its original value. For example, an 80 IBU beer will have 60 IBUs after 1 year.
Here's the relevant part of the text:QuoteThe ratio of the isohumulones depends on the reaction conditions. In the wort medium it is normally 68:32 in favour of the cis-compounds. However, the cis-compounds are much more stable (half-life >> 5 years) than the trans-isomers (half-life of ca. 1 year) during the course of time. This affects, obviously, the cis:trans ratio and has significant consequences with respect to taste and flavour stability.
Of course, other variables do come into play, so these figures can't be taken as exact, But then, as we all know, that's how it is with brewing. Our malt isn't exactly the color on the label (usually a range of values), and hops aren't the bitterness on the pack since they degrade from the get go. So, although not exact, these figures should offer a good estimate.
I really appreciate it. I actually have two reasons to want to go. The first of course is the BDoY competition.
The second is a buddy of mine, Paul Ogg, has a rare form of cancer and did not respond well to chemo and to a stem cell transplant. He is currently traveling to NYC for a clinical trial and it put him in the ICU last week, but he was back there over this weekend. Paul lives in Denver and teaches at the College of Mines there as well as being part owner of Declaration Brewing. He and I met on a homebrewing forum on one of the beer rating sites and we've traded beers countless times. Paul is also a BJCP judge.
His prognosis is not looking good and I am hopeful if I get there in April he will still be strong enough to sit down for a few beers. They have insurance, but the bills are still piling up. I believe they have surpassed their original fundraising goal, but if you feel so inclined or know Paul here is the YouCaring page.