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Lignans and Flavonoids from the Seeds of Centaurea bornmuelleri Hausskn. Ex. Bornm and Centaurea huber-morathiiWagenitz.

Shoeb A., MacManus S., Jaspars M., Nahar L., Kong-Thoo-Lin P., Celik S., Sarker S.

Polish Journal of Chemistry

2007

Vol. 81, nr 1

39-44

The reversed-phase preparative HPLC purification of the methanol extracts of the seeds of two Turkish endemic species Centaurea bornmuelleri and Centaurea huber-morathii afforded several dibenzylbutyrolactone-type lignans and flavonoids. The lignans arctiin, matairesinol and matairesinoside, and the flavonoid, afzalin, were found in both species. While arctigenin and astragalin were only present in C. bornmuelleri, kaempferol was isolated from huber-morathii. Aplant sterol, stigmast-4-en-3gamma-ol, was also isolated from the dichloromethane extract of C. bornmuelleri. The structures of the isolated compounds were determined by spectroscopic means. The chemotaxonomic significance of these compounds within the genus Centaurea has been discussed.

Chemical Composition and Biological Activity of Essential Oil from Flowerheads of Centaurea polymorpha Lag. (Asteraceae) GrowingWild in Spain

Forimsano C., Senatore F., Bellone G., Bruno M., Grassia A., Raio A., Rigano D.

Polish Journal of Chemistry

2006

Vol. 80, nr 4

617-622

The volatile constituents of the flowerheads of Centaurea polymorpha Lag. were extracted by hydrodistillation and analysed by GC and GC-MS. 63 components, amounting to 91.6% of the oil, were identified. Waxes and sesquiterpenes were the most abundant components in the oil. alfa-Cedrene (3.9%), beta-cedrene (3.6%) and beta-curcumene (3.0%) were the most representative sesquiterpene hydrocarbons while caryophyllene oxide (2.6%) was the most abundant oxygen containing sesquiterpene. The study on the biological activity of the oils showed no significant activity.

Antioxidant Flavonoids from Pulicaria undulata

Ahmad V., Rasool N., Abbasi M., Rashid M., Kousar F., Zubair M., Ejaz A., Choudhary M., Tareen R.

Polish Journal of Chemistry

2006

Vol. 80, nr 5

745-751

The phytochemical investigation of the ethyl acetate soluble fraction of the whole plant of Pulicaria undulata L. (syn. Pulicaria crispa Forssk.) yielded two new flavonoid glycosides, pulicaroside (1) and undulatoside (6) along with four known flavonones (2-5). The structures of the new compounds were identified by 1D and 2D-NMR techniques along with other spectral evidences and by the comparison with the published data of the closely related compounds. All the flavonoids (1-6) exhibited superoxide anion scavenging activity.

Sesquiterpene Lactones from Crepis zacintha

Kisiel W., Michalska K., Szneler E.

Polish Journal of Chemistry

2002

Vol. 76 / nr 11

1571-1576

A series of guaianolide-type sesquiterpene lactones, including two new natural products, was isolated from the roots of Crepis zacintha. The presence in the plant material of three pairs of guaianolide epimers at C-4 was proved by 1D and 2D NMR spectral methods.