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Caffeine content of roasted beans.

This is a discussion on Caffeine content of roasted beans. within the Caffeine Health forums, part of the Coffee Addicts category; I hope this is something everybody knows. I don't mind looking dumb if it means that I can get a quick answer to my question. ...

  1. #1
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    Caffeine content of roasted beans.

    I hope this is something everybody knows. I don't mind looking dumb if it means that I can get a quick answer to my question.

    Does anyone know the quantity of caffeine per ounce of fresh roasted Arabica beans? I'm interested in dark roasts especially.

    I've rummaged around the net and found plenty of comparisons of coffee, tea, chocolate and the like -- but these invariably refer to the caffeine per cup of brewed coffee (presumably one of the lighter roasts at a realatively low concentration). I have found generalities stating that the roasting process actually destroys caffeine, so that green beans have lots more than roasted beans and light roasts have more than dark roasts. But nobody seems to want to let go of quantitative information like, "How many milligrams of caffeine in an ounce of French roast beans?" Can anyone help?

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  3. #2
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    I believe medium roasts are around 200. Therefore darker roasts must be slightly less. To put it in perspective a can of coke has around 50 if my memory serves me.

  4. #3
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    Re: Caffeine content of roasted beans.

    Quote Originally Posted by Skeltron
    I hope this is something everybody knows. I don't mind looking dumb if it means that I can get a quick answer to my question.
    ...snip...But nobody seems to want to let go of quantitative information like, "How many milligrams of caffeine in an ounce of French roast beans?" Can anyone help?
    Hello. Just a note on roasting. The more you roast a bean the more caffeine you lose. Keep that in mind when you do your roasts.

    Len

  5. #4
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    I'm pretty sure this wont help, but it's all i know.

    by cup

    coffee-80-100mg
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    Life: cloudy days, coffee shops, the smell and feel of summer rain,
    abstract, rhythm, human synchronicity,
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    different brews

    Does anyone know the difference in caffeine content from:

    1 cup drip coffee
    1 cup French Press coffee (14g of grinds)
    1 espresso

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    Re: different brews

    Quote Originally Posted by djveed
    Does anyone know the difference in caffeine content from:

    1 cup drip coffee
    1 cup French Press coffee (14g of grinds)
    1 espresso
    Google comes up with:

    6oz Drip - 90-175
    Espresso - 1.5-2oz 100
    Brewed?? - 80-135

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    So it seems that they're all pretty similar. That solves it. Thanks.

  9. #8
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    Quote Originally Posted by djveed
    So it seems that they're all pretty similar. That solves it. Thanks.
    There is a definite variation in the amount of caffeine in each Espresso blend. Depends on the beans used I guess but some will have your eyes bugging after one & others I can drink 2-3 without getting too buzzed.

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    Re: Caffeine content of roasted beans.

    Its simple math:

    First, caffeine content in arabica coffee hovers around 2.2% - or 2.2g per 100 grams of coffee. Since 1oz is 28.35 grams:

    (2.2g caffeine/100g coffee) x (28.35g/1 oz) = 0.6237g if coffee per oz of arabica coffee.

    The issue of caffeine content across both dark and light coffee really depends on how you look at the situation. Per bean, the caffeine content remains the same, but when prepared (ie brewed) it MAY be possible that darker coffee may have more caffeine, since it weighs less (more H2O loss, etc) than lighters - hence, you NEED more coffee (ie. mass) to achieve the same throw weight and thus, have more material to "extract" caffeine.

    Joseph
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    Re: Caffeine content of roasted beans.

    Hello Everyone,

    I just registered on the coffeechemistry.com website and started to explore it. There is lots of interesting stuff there (But you'll need to register if you want to see everything)

    Rose

 

 
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