Welcome to QuickFix, the new label from The Toxicologist Today, where you get the answers to the most quotidian questions that you're ashamed to plead ignorance on or even ask your mates about. In the future I'll be covering issues that apparently everyone is an expert on, but only the actual experts can address them properly.
My wife asked me the other day How much caffeine is there in decaf coffee?
The answer was found in 3 seconds and is posted here from the Nescafe.co.uk website. No hussle! No scientific jargon!, just an immediate QuickFix to save you time.
Caffeine in decaf coffee, [http://www.nescafe.co.uk/caffeine_in_decaf_coffee_en_com.axcms], last visited on the 5th of April 2014, last update
I want to overdose redirects you to the article by Ramalakshmi, K. Raghavan, B (1999). "Caffeine in coffee: Its removal. Why and how". Critical reviews in food science and nutrition, 39(5), pp.441-456.