This reagent was invented by the German pharmacologist , Johann Georg Dragendorff ( 1836 -- 1898 ) at the University of Dorpat .
Alkaloids , if present in the solution of sample , will react with Dragendorff 's reagent and produce an orange or orange red precipitate .
This reagent was invented by the German pharmacologist , Dragendorff     ( 1836 -- 1898 ) at the University of Dorpat .
Alkaloids , if present in the solution of sample , will react with Dragendorff 's reagent and produce an orange or orange red precipitate .