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| Decaffeinated ： ウィキペディア英語版 |
Decaffeination
Decaffeination is the removal of caffeine from coffee beans, cocoa, tea leaves and other caffeine-containing materials. While soft drinks which do not use caffeine as an ingredient are sometimes described as "decaffeinated", they are better termed "non-caffeinated" because decaffeinated implies that there was caffeine present at one point in time. Decaffeinated drinks contain typically 1–2% of the original caffeine content, and sometimes as much as 20%.〔 Decaffeinated products are commonly termed decaf.
== Decaffeination processes for coffee ==
In the case of coffee, various methods can be used. The process is performed on unroasted (green) beans and starts with steaming of the beans. They are then rinsed with a solvent that extracts the caffeine while leaving other constituents largely unaffected. The process is repeated from 8 to 12 times until the caffeine content meets the required standard (97% of caffeine removed according to the international standard, or 99.9% caffeine-free by mass per the EU standard).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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