caffeine
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caffeine
A chemical substance with a stimulating effect on the central nervous system that occurs naturally in coffee beans, tea leaves, cocoa beans, and kola nuts.
Ich trinke abends keinen Kaffee mehr, weil mich das Koffein vom Schlafen abhält.
I don't drink coffee in the evening anymore because the caffeine keeps me from sleeping.
The word is derived from 'Kaffee' (coffee). The ending '-in' is often used in German for chemical substances and active ingredients, as in 'Aspirin' (aspirin) or 'Penicillin' (penicillin).
Koffein ist der anregende Wirkstoff im Kaffee.
Caffeine is the stimulating active ingredient in coffee.
'Koffein' (caffeine) is an uncountable noun (a substance name). Therefore, it is usually used without an article or with quantity words such as 'viel' (much / a lot of), 'wenig' (little), or 'kein' (no).
Dieser Tee enthält nur sehr wenig Koffein.
This tea contains only very little caffeine.
In everyday life, the derived adjectives 'koffeinhaltig' (containing caffeine / caffeinated) and 'koffeinfrei' (without caffeine / decaffeinated) are very useful. You often find them on drink packaging.
Möchten Sie normalen oder koffeinfreien Kaffee?
Would you like regular or decaffeinated coffee?
