Sources related to average caffeine content per preparation method
for (6oz cup, arabica coffee)
- Filter drip 150 [Mg. of Caffeine]
- Percolated 125
- Espresso 100
- Instant 60
instant coffee to have less caffeine than the methods involving filtering.
I just can't get my head around that, as in instant (e.g., Nescafe) coffee preparation we practically put the coffee into the cup and eat it.
How is it possible filtered beans to have more caffeine than eaten beans?