how much caffeine is in a cup of decaf coffee?
Caffeine was isolated from the coffee samples and measured by gas chromatography. Every serving but one â instant decaffeinated Folgers Coffee Crystals â contained caffeine, ranging from 8.6 milligrams to 13.9 milligrams. In comparison, an 8-ounce cup of drip-brewed coffee typically contains 85 milligrams of caffeine.