gentiopicroside

Gentiopicroside is a central secoiridoid glycoside among the bitter compounds of gentian root. Dried gentian root contains bitter compounds at 2–8% by content, concentrated in the bark, and most of this is composed of secoiridoid glycosides. The most abundant of these is gentiopicroside (alternative names gentiamarin, gentiopicrin), while another bitter compound, amarogentin, is present at only 0.025–0.4%. The amount contained in the root increases with elevation and reaches its highest level in spring.

When compared by bitter value, which indicates the intensity of bitterness, gentiopicroside is reported at 12,000, roughly 4 orders of magnitude smaller than amarogentin's value of 58,000,000. However, because gentiopicroside is present in far greater quantity than amarogentin, it cannot be determined from this evaluation alone which actually contributes more strongly to the bitterness perceived in the root overall. These numerical values are from regulatory authority evaluation reports that consolidated textbook-based sources, not direct analytical data.

In comparative analysis of traditional preparation methods for the related species Gentiana purpurea (a root of the Gentianaceae family with bitter taste), the extraction yield of gentiopicroside (gentiopicrin), the principal bitter compound, differs significantly by preparation method, and within the scope of the abstract it can be confirmed that maceration with 40% and 70% ethanol, as well as boiling with acetic acid (3% and 6%), vinegar, and raw milk gave the highest extraction yields.