Flavonoids from Jovibarba globifera (Crassulaceae) rosette leaves and their antioxidant activity.

Seven flavonoids new for the genus Jovibarba, kaempferol 1, kaempferol 3-O-galactopyranosyl-(1 → 2)-O-α-L-rhamnopyranoside 2, kaempferol 3-O-β-D-glucoside 3, kaempferol 3-O-α-L-rhamnopyranosyl-7-O-α-D-glucofuranosyl-(1 → 2)-O-α-L-rhamnopyranoside 4, kaempferol 3-O-β-D-glucopyranoside-7-O-α-L-rhamnopyranoside 5, kaempferol 3,7,4'-O-trimethyl ether 6 and quercetin 7, were isolated from fresh and dried leaves of J.ovibarba globifera subsp. globifera.

Identification and determination of triterpenoids in Hieracium pilosella L.

Fractions of triterpenoids have been isolated from herb, inflorescences, and rhizomes with roots of Hieracium pilosella by typical extraction with petroleum ether. The fraction from inflorescences was investigated using GC-MS techniques. The occurrence of alpha- and beta-amyrin, taraxerol, taraxasterol, and fern-7en-3beta-ol has been observed.

HPTLC-densitometric method of determination of oleanolic acid in the Lamii albi flos.

HPTLC combined with densitometric method was used to determine the content of oleanolic acid in acetone extract from the Lamii albi flos L. The plant extract was separated on Si 60 HPTLC plates and determined with the use of two densitometric methods: measurement of fluorescence and absorbance. The content of oleanolic acid was statistically calculated.

The furanocoumarins in the roots of Heracleum sibiricum L.

From roots of Heracleum sibiricum L (cow parsnip) collected natural state, a raw crystalline furanocoumarin precipitate was obtained containing four compounds: bergapten, isopimpinellin, pimpinellin, sphondin. The isolated compounds were identified with H1NMR.