ÜBER DIE PRÜFUNGSMETHODOLOGIE DES ÄTHERISCHEN ÖLES BEI ZÜCHTUNGSARBEITEN VONMENTHA PIPERITA

Constituents of Chrysothamnus paniculatus 3: 3,4,5-Tricaffeoylquinic Acid (a New Shikimate Prearomatic) and 3,4-, 3,5- and 4,5-Dicaffeoylquinic Acids

“…Earlier work on ether and ethyl acetate extracts of Chrysothamnus paniculatus (Gray) Hall (Compositae) gave a series of grindelane diterpenoids (1-3). We now report the presence, in the methanol extract of this plant, four shikimate prearomatics: 3,4,5-tricaffeoylquinic acid (la), which is new, and 3,4-, 3,5-and 4,5-dicaffeoylquinic acids (2a, 3a and 4a, respectively), which had been found in coffee beans (4) and various other plants (5). These four natural products were not separated but were converted into their methylate derivatives lb-4b, which were separated chromatographically and characterized by 'H-nmr (table 1), 13C-nmr (table 2), and mass spectroscopy (scheme 1), as described below.…”

Preparative separation of polyphenols from artichoke by polyamide column chromatography and high-speed counter-current chromatography

“…3 The major chemical components of artichoke include flavonoids, mono-and di-caffeoylquinic acids, and it has been found to be a rich source of polyphenols. [4][5][6] Polyphenols have many bioactivities, such as hepatoprotection, antioxidation, and antibacterial effect. Chlorogenic acid, luteolin-7-O-β-D-rutinoside, luteolin-7-O-β-D-glucoside, and cynarin are the main active compounds in artichoke.…”