Confused (-_-)
Did Friedlieb Ferdinand Runge discover caffeine in 1819 or in 1820? some old references please
NB, Caffeine was isolated independetly by Runge, Robiquet, and (Pilletier and Caventou)
Caffeine was discovered in tea (Camellia sinensis)
and coffee (Coffea arabica) in the 1820s. Reference is attached here.
Thank you my dear Shafaq for the paper, however, for the year, it is still not clear, the two dates appear in the litterature
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