What is a good estimate of the caffeine content per gram of ground coffee for different roasts?

What is a good estimate of the caffeine content per gram of ground coffee for different roasts?

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  1. According to Illy and Viani, “Espresso Coffee: The Chemistry of Quality” (Academic Press, 1995), roast level has very little effect on caffeine level. A little bit of caffeine is sublimated (evaporated, basically, but without going through a liquid phase), but on a per-gram basis the caffeine could go up a bit with roasting because of loss of moisture (same caffeine, less bean weight). Average caffeine content is 1.2% in Arabica coffees and 2.2% in Robusta, with some variations among varietals (e.g., 1.05% for Arabica Typica and 1.34% for Arabica Catuai).

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