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10/21/2021 2:41 AM
muckymuck, mckinleyharris and williamjonex welcome cup

10/19/2021 6:22 AM
Welcome tarunk!

10/17/2021 12:40 PM
Ploni and nader fouad, Welcome!

10/15/2021 2:19 AM
merlot85, maycondelpiero and hoeltz, Welcome !

10/14/2021 10:06 AM
Thanks for the addition to the group. Seriously considering building a drum roaster along the lines of oldgrumpus's. Love the design and craftsmanship.

In Memory Of Ginny
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Caffeine content drum vs air
chaff
I'm escaping cruel February in the land of palm trees and, running short of popper-roasted beans that I brought with me, just bought some medium roasted Brazil and Columbian from Culinary Roasters in Stuart, FL. Their coffee is excellent to my taste but I immediately got a caffeine buzz and have been fighting the headache for two days. As soon as I went back to the remainder of my air-roasted beans things got better.

I've read about the stripping effect on flavour of air roasting but couldn't find anything about the effect on caffeine content, is this a known effect of air roasting ?
Randy G
My first thought is that the batch of Colombian was a blend that contained some Robusta, but caffeine content of one origin or blend to another is the most likely cause. I can't remember reading anything on roast methnd causing a change in caffeine content.

Life's too short to drink bad coffee.
chaff
Robusta ? I never even .. etc Anyway, I hadn't thought of that; I'd suppose that wouldn't be worth it for them, that my efforts are weak in comparison. I guess I'll just have to enjoy the pleasures of titrating down in a few weeks time. Thanks for the response !
renatoa

Quote

Randy G wrote:

I can't remember reading anything on roast methnd causing a change in caffeine content.


There is a myth about darker roasts versus lighter... not sure if still true...

https://www.perfe...-caffeine/

But surely caffeine don't evaporate, so increased airflow is not the culprit, the boffins would let us know until now.
allenb

Quote

the boffins would let us know until now.


Buffo Boffin or research geek?
allenb attached the following image:
_allo_there_master_hobbit_by_mad_hattie-d6hrgf4.jpg

1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
renatoa
"The English scientists found that..." Grin
allenb
Without those Boffins helping out the British, WW2 would have most likely turned out differently.
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
jkoll42
Like Randy said Robusta has significantly higher caffeine content. Arabica is generally 1-1.4% Robusta has generally about double that. I copypasta'd an old SM post with the ranges of some origins from one roaster for one season. You can range even in Arabica 40%.

I doubt the method of roasting would have any effect on the content but I've heard that roast level might or might not make a difference but haven't seen any actual tests.
-Jon
Honey badger 1k, Bunn LPG-2E, Technivorm, Cimbali Max Hybrid, Vibiemme Double Domo V3
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