Not a member yet?
Click here to register.

Forgotten your password?
Request a new one here.
You must login to post a message.

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

Latest Donations
JackH - 25.00
snwcmpr - 10.00
Anonymous - 2.00
Anonymous - 5.00
Anonymous - 5.00
Users Online
Guests Online: 16

Members Online: 0

Total Members: 7,369
Newest Member: williamjonex

View Thread

Who is here? 1 guest(s)
 Print Thread
Caffeine content drum vs air
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.
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 !


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...


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


the boffins would let us know until now.

Buffo Boffin or research geek?
allenb attached the following image:

1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
"The English scientists found that..." Grin
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
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.
Honey badger 1k, Bunn LPG-2E, Technivorm, Cimbali Max Hybrid, Vibiemme Double Domo V3
Jump to Forum:

Similar Threads

Thread Forum Replies Last Post
How drum mass affects the roast curve Drum Roasters 11 09/12/2021 5:08 PM
Is automated Artisan PID control of a drum roaster a "fool's errand"? Drum Roasters 8 08/30/2021 5:47 AM
Cleaning an oily, stained popper drum Popcorn Popper roasting 4 08/15/2021 3:05 PM
Air Fryer Drum Roaster??? Drum Roasters 4 08/04/2021 7:44 PM
Another 1.5kg or 3lb drum roaster from scratch Building a Coffee Roaster 112 07/23/2021 9:49 AM
Homeroasters Association Logo, and all Content, Images, and Icons © 2005-2016 Homeroasters Association - Logos are the property of their respective owners.
Powered by PHP-Fusion Copyright © 2021 PHP-Fusion Inc
Released as free software without warranties under GNU Affero GPL v3
Designed with by NetriX