Page 186 - Phytochemistry 2 (06-PG 605)

II-Bitter principles
Definition :

 Bitter principles are heterogonous compounds,belong
to different chemical groups

 They possess a characteristic bitter taste.

 They are neither belong to the class of alkaloids nor to
glycosides.

They are abundant in certain plant families especially
Compositae, Labiatae, Gentianaceae and Umbellifereae.