Coffee remains the Germans’ favorite beverage, yet many coffee drinkers prefer the decaffeinated alternative. But decaffeinated coffee always contains a certain residual amount of caffeine. How can this content level be verified?
Caffeine exists under 2 polymorphic forms (I and II). Compression of form I induces its transformation into form II, leading to changes in its properties. Heating with DSC ensures that caffeine is in the correct form.