N. Menkovic et al., Chemical composition and seasonal variations in the amount of secondary compounds in Gentiana lutea leaves and flowers, PLANTA MED, 66(2), 2000, pp. 178-180
The chemical investigation of MeOH extracts of Gentiana lutea leaves and fl
owers showed that xanthones were one of the dominant class of compounds. Se
coiridoids and flavonoids were also recorded. The amount of secondary metab
olites varied depending on development st-age. In the phase of flowering, l
eaves are rich with compounds possessing C-glycoside structures while O-gly
coside structures accumulate mainly before flowering.