The bitter principle, known as gentianin, is a glucoside, soluble in water and alcohol.
In this way, the sweet is sometimes converted into a bitter principle.
The root-bark of E. atropurpureus is the source of euonymin, a bitter principle with a powerful stimulating effect on the liver.
The bark is free from any bitter principle, as well as from tannic acid.
Contains neither tannic nor gallic acid, but abounds with a yellow, bitter principle, soluble in water and alcohol.
There is also present a minute quantity of a bitter principle.
They were a favorite spring tonic, where all physicians and housewives prescribed "the bitter principle" in the spring time.
Welters bitter principle was prepared by acting on silk with ten or twelve times its weight of nitric acid.
From cocoa and Iceland moss, freed from its bitter principle, cetrarine.
It may be purified from its bitter principle by a little cold solution of potassa.