Home Espresso FAQ (#)
„Fine Arabica coffees contain one half of the caffeine found naturally in the cheaper Robusta beans that are used in supermarket coffees. (Using Robustas in espresso blends is another controversy that tweaks the regulars around the newsgroups.) The results of chemical analysis performed by Lauk's Testing Labs in Seattle were recently posted at the LucidCafe Web site by David Schomer. Check out these numbers: Espresso Ristretto (18.5 grams of finely ground coffee, 1 3/4 fluid ozs) 230 milligrams of caffeine. Paper Filtered, Cone drip brewed coffee (18.5 grams of Arabica coffee, about 16 fluid ozs) 340 milligrams of caffeine Those are interesting numbers but I don't know anyone who makes a 16 oz pot using only 18.5 grams of ground coffee.“
http://gawlowski.com/matt/html/ espresso_faq.html - Cached
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„So, apart from method, what else does the crema signify? Back to Ewan Reid."The crema allows us to guess at the type of bean used in the espresso blend. A blend using lots of robusta beans will have a dark brown and, although shortlived, an effervescent crema. Arabica beans will have a lighter coloured crema, with a less vigorous foam." It's precisely because of these visual cues that you can see our coffee experts staring intently at the cup of espresso, before raising it to their lips.“
http://www.matthewalgie.com/find_out/ lab-cremcon.html
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Robusta Coffees for Home Roast Espresso Blends
„(Also, Robustas such as these are now being used in filter coffee "high caffeine" blend since the caffeine levels are doubled in Robusta over Arabica. But this really isn't something I am going to endorse, or even investigate myself even though such brands as ShockCoffee are doing exactly this...) Also check out Nestle's description of Robusta -interesting!“
http://www.sweetmarias.com/coffee.robusta.html
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BSCA - BSCA Certified Roasted Coffees - ASTRO CAFÉ
„From a chemical point of view, the main difference between the two types of beans is found in the percentage of caffeine: 1-1.7 in Arabica and 2-4.5 in Robusta beans.“
http://www.bsca.com.br/ certified.php?lang=en&certified_id=4
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„* For great taste with less cafeine buy arabica coffee. It's slightly more expensive, but contains less caffeine than blends that combine arabica and robusta beans. * Roasted coffee beans start to lose some of their flavor within two weeks. Ground coffee begins to lose its flavor in minutes.“
http://www.juanvaldez.com/menu/preparation/ perfect.html
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Espresso Blending Techniques (INeedCoffee.com)
„Now small amounts (less than 10%) are rules of thumb, and its got to be good quality robusta (there is some out there. In fact I've tasted robustas better than some arabica beans I've been sent). Don't be a snob, it adds a little caffeine kick to a blend, and it gives you great crema and balances out the cup. I have blends without robusta in them that are great, but none are better than those blends which do contain Robusta.“
http://www.ineedcoffee.com/04/blending/
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