Search results for "Terpenoid"
showing 10 items of 221 documents
Volatile components ofCentaurea cineraria L. subsp.umbrosa (Lacaita) Pign. andCentaurea napifolia L. (Asteraceae), two species growing wild in Sicily
2003
The volatile components of the flowerheads of Centaurea cineraria L. subsp. umbrosa (Lacaita) Pign. and Centaurea napifolia L. were obtained by hydrodistillation and identified by GC and GC-MS. Altogether 55 components were identified, mostly sesquiterpenes and hydrocarbons. Copyright © 2003 John Wiley & Sons, Ltd.
Composition of the essential oil fromflowerheads ofChrysanthemum coronarium L.(Asteraceae) growing wild in Southern Italy
2004
The essential oils from the aerial parts of Chrysanthemum coronarium L. (Asteraceae) growing wild in two different localities of Southern Italy, Lascari (L) and Palinuro (P), were obtained by hydrodistillation in a 0.13-0.16% yield. The oils were analysed by GC and GC-MS; 68 constituents, amounting to 89.0% of the oil (L), and 43 constituents, amounting to 91.6% of the oil (P), were identified. The trans-spiroketal-enol ether 2-(2,4- hexadiynylidene)-1,6-dioxaspiro(4,4)non-3-ene (trans-tonghaosu) with chrysanthenyl and lyratyl esters and camphor were the main components of the oils. Copyright © 2004 John Wiley & Sons, Ltd.
Terpenoid Constituents ofZanthoxylum acanthopodiumDC. Leaves
2008
Abstract The chemical composition of the essential oil of Zanthoxylum acanthopodium DC. leaves was analyzed by GC and GC/MS. Fifty-eight compounds accounting for 75.6% of the oil were identified. The major compounds were linalool (14.3%), 9,12-octadecadien-ol (8.4%), 1,8-cineole (7.7%), 2-undecanone (7.3%), farnesol (3.6%), 9,12,15-octadecatrien-1-ol (3.2%) and β-caryophyllene (3.0%).
Chemical composition of the essential oils fromEriocephalus africanus L. var.africanus populations growing in Spain
2007
Essential oils from the aerial parts of three Eriocephalus africanus L. var. africanus populations were analysed by means of GC–FID and GC–MS. Sixty-one constituents were identified, representing more than 96% of the total oil composition. Artemisia ketone (56.46–56.58%), intermedeol (9.19–11.63%) and γ-eudesmol (4.26–5.64%) were the main compounds. Application of the Pearson correlation coefficient showed high similarity between the nine samples analysed. Copyright © 2007 John Wiley & Sons, Ltd.
Spirocurcasone, a diterpenoid with a novel carbon skeleton from Jatropha curcas.
2010
Spirocurcasone (14), a diterpenoid possessing the unprecedented "spirorhamnofolane" skeleton, was isolated from the root barks of Jatropha curcas, a plant extensively cultivated throughout the world, along with 11 known and two other new diterpenoids. The stereostructure of spirocurcasone was established using HRESIMS, NMR, and quantum mechanical calculation of the electronic circular dichroic (ECD) spectrum. Some of the isolated diterpenoids showed a potent activity against L5178Y, a mouse lymphoma cell line.
Antifeedant activity of neo-clerodane diterpenoids from Teucrium fruticans and derivatives of fruticolone
1999
The antifeedant activity of three neo-clerodane diterpenoids, fruticolone, isofruticolone and fruticolide from Teucrium fruticans was assessed using larvae of Spodoptera littoralis. Isofruticolone was one of the most potent of the Teucrium derived neo-clerodanes. Chemical modification of functional groups on fruticolone showed that its activity could be enhanced.
Donellanic acids A–C: new cyclopropanic oleanane derivatives from Donella ubanguiensis (Sapotaceae)
2012
Abstract Three new cyclopropanic oleanane triterpenoids and ten known compounds were obtained from Donella ubanguiensis using chromatographic methods. The structures were established on the basis of mass spectrometric and NMR data and by comparison with values reported in the literature. The structures of the new compounds were confirmed by X-ray crystallography. A part of the isolated compounds was evaluated for cytotoxic and antimicrobial activities.
An ent-kaurane from Sideritis huber-morathii
1996
WOS: A1996VW86500030
A diterpenoid with antifeedant activity from Scutellaria rubicunda
1999
Abstract Two diterpenoids have been isolated from Scutellaria rubicunda subsp. linneana : (11 S ,13 S ,15 R and S , 16 R ,19 S )-6 α -acetoxy-19-tigloyloxy-2 α ,19;4 α ,18;11,16;15,16-tetraepoxy-neo-clerodan-15-ol (scutecyprol B) and (11 S ,13 S ,15 R and S , 16 R ,19 S )-6 α -acetoxy-2 α ,19;4 α ,18;11,16;15,16-tetra-epoxy-neo-cleroda-15,19,diol (scutalbin C). Both compounds were tested for antifeedant activity against larvae of some species of Lepidoptera. Scutecyprol B shows potent activity at 100 ppm.
Scuteparvin, a new neoclerodane diterpenoid from Scutellaria parvula
2004
Abstract The diterpenoid fraction occurring in the acetone extract of the aerial parts of Scutellaria parvula has been investigated. Only one neoclerodane diterpenoid, scuteparvin, was isolated and its structure elucidated as 4α,18-epoxy-6α- trans -cinnamoyloxy- neo clerod-13-en-15,16-olide, a new natural product. Scuteparvin is quite similar to the already known ajugarin V from Ajuga remota , the only difference being the occurrence of a trans -cinnamoyl ester system instead of an acetate on the 6α-OH group. This finding confirms that the genera Scutellaria and Ajuga are closely related taxonomically.