How chemicaly calculate the IBU - Home Brew Forums

Register Now!
Home Brew Forums > Home Brewing Beer > Brew Science > How chemicaly calculate the IBU

Thread Tools
Old 11-28-2012, 01:32 AM   #1
Nov 2012
Posts: 24


I would want to know if there is a way to calculate the IBU in a laboratory instead of with a formula

Thank you all

Reply With Quote
Old 11-28-2012, 01:54 AM   #2
Senior Member
smokinghole's Avatar
Nov 2009
Lucid Dream Land
Posts: 2,917
Liked 131 Times on 107 Posts

The alcohols are expensive and I hope you have access to a UV Spec.
Going through life is hard.
Going through life stupid is harder.

Reply With Quote
Old 11-28-2012, 03:33 PM   #3
Aug 2010
McLean/Ogden, Virginia/Quebec
Posts: 9,197
Liked 1465 Times on 1117 Posts

The calculation is trivial. It's 50 times the absorbance in 1 cm at 275nm.

There is only 1 alcohol involved (octanol) and so little is used (the pipet tip used to measure out the beer sample is dipped in it and shaken off) that 100 brewers could share a $35 liter and have a lifetime supply. The solvent, if you buy it in spectrographic grade is expensive but the per test cost is small. You can filter or distill (please don't!) ordinary gasoline and use that reducing the cost even further but it hardly seems worth the effort to save a couple of bucks.

Reply With Quote
Thread Tools

Similar Threads
Thread Thread Starter Forum Replies Last Post
Any way to calculate ABV? scorpionc53 Brew Science 8 10-20-2012 03:14 PM
Anyone know how to calculate this? Lodovico Brew Science 6 03-04-2012 05:20 AM
How do you calculate ABV. IanPC Beginners Beer Brewing Forum 12 01-31-2012 12:50 AM
How to calculate FG? Fireguy Cider Forum 7 10-10-2008 11:30 AM
Can someone calculate this... dirtymike1 Recipes/Ingredients 3 08-25-2008 08:13 PM

Forum Jump