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Higher caffeine levels in some beans?
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Chanty
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Posted Mon Sep 30, 2013, 7:40pm
Subject: Higher caffeine levels in some beans?
 

Just out of curiosity, do some roasters have a higher caffeine content in their beans than other roasters?  I occasionally get a particular blend and noticed that my heart tends to start beating faster & skipping beats with this particular blend and not with other blends I've used.  I only use espresso blends.
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NobbyR
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Posted Tue Oct 1, 2013, 1:55am
Subject: Re: Higher caffeine levels in some beans?
 

Caffeine contents vary: Green beans contain about 0.92.6% of caffeine depending on the variety. After roasting about 1.32.0 % still remain, whereupon arabica beans generally have less caffeine than robusta.

 
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wabbitt
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Posted Tue Oct 1, 2013, 9:03am
Subject: Re: Higher caffeine levels in some beans?
 

Chanty Said:

Just out of curiosity, do some roasters have a higher caffeine content in their beans than other roasters?  I occasionally get a particular blend and noticed that my heart tends to start beating faster & skipping beats with this particular blend and not with other blends I've used.  I only use espresso blends.

Posted September 30, 2013 link

Absolutely.  Other than the obvious Arabica vs Robusta, caffeine levels in your cup are also affected by the coffee bean's growing season, roast level (lighter roast are generally higher in caffeine), and brew method.  I'm sure there are other factors.  Perhaps you are more caffeine sensitive right now.  On the other end of the spectrum, people can also build up a caffeine tolerance.
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Ryebread119
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Posted Wed Oct 2, 2013, 1:42pm
Subject: Re: Higher caffeine levels in some beans?
 

Yes! When you order an espresso roast from different roasters, you are specifying the roast profile (i.e., the darkness of the coffee). Most roasters create their own espresso blend. Each blend is very different between roasters. Some might use a blend of Kenyan, Ethiopian, and Guatemalan for example, while another roaster blends together a Honduran bean with a Brazilian bean. Right now, it's pretty popular to pull "single origin" espresso. The caffeine content is dependant on the coffee strain, the country of origin, and the roast profile. If you are only buying espresso roasts, lets assume they are arabica, then the caffeine content is most reliant on the specific blend of coffee's they include in their roast.

I've attached this link which lists the relative caffeine content of arabica and robusta by country of origin:
http://vdpcoffee.nl/Coffein.pdf

 
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LaurenMartin
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Posted Thu Oct 3, 2013, 2:56am
Subject: Re: Higher caffeine levels in some beans?
 

I have heard that espresso coffee has more caffeine than regular drip coffee. and that all depends on several factors including brew time, dwell time, water temperature, grind level, roast level, bean type, blend, etc. that all have a significant affect on the final extraction of caffeine.
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z0mbie
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z0mbie
Joined: 26 Sep 2013
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Posted Sun Oct 6, 2013, 3:44am
Subject: Re: Higher caffeine levels in some beans?
 

LaurenMartin Said:

I have heard that espresso coffee has more caffeine than regular drip coffee. and that all depends on several factors including brew time, dwell time, water temperature, grind level, roast level, bean type, blend, etc. that all have a significant affect on the final extraction of caffeine.

Posted October 3, 2013 link

The OP is asking two different questions:

The first being in the subject title, which refers to caffeine in beans.. Answer: The roasting process actually reduces caffeine in beans.  The darker the roast the less caffeine. Thereby light and medium roasts have higher caffeine content than French and Italian roast.   And obviously green coffee will have the most.

The second question is in his message body and pertains to the drinks themselves.  He asks if espresso coffee has more caffeine than regular drip. Answer: By equal volume, absolutely. Espresso is far more concentrated.  But assuming the both drinks used the same quantity of grounds by weight (albeit roasted differently), then no.  The 1 oz shot of espresso will actually have less caffeine than the 8 oz cup of coffee because of the reason above. Espresso roast is generally darker and therefore contain less caffeine concentrations.
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CoffeeLoversMag
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CoffeeLoversMag
Joined: 10 Jan 2013
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Location: Seattle
Expertise: I love coffee

Posted Fri Nov 22, 2013, 6:51am
Subject: Re: Higher caffeine levels in some beans?
 

Yes, caffeine content varies on the kind of beans being roasted. However, roasting also affect the caffeine content.

Here are the facts about the caffeine content when roasted:
  1.  Measuring the coffee by weight can actually have more caffeine in dark roast because the water loss is faster than the caffeine loss during roasting.
  2.  Measuring the coffee by volume such as by scoop, less caffeine can be expected because beans expand as you roast.
  3.  Light roast can simply have more caffeine because you will have more coffee grounds.

 
Did you know...? Dark roast coffees actually have less caffeine than lighter roasts due to the fact that the process of roasting burns off caffeine.
www.coffeeloversmag.com/theMagazine
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