Two novel monoterpene glycosides from Erigeron linifolius Willd. & sesquiterpene lactones and triterpenes from Elephantopus scaber Linn
Two novel monoterpene glycosides, a sesquiterpene and stigmasterol are isolated from the chloroform extract of a Philippine medicinal plant, Erigeron linifolius Willd. by repeated gravity column chromatography.The structure of the first glycoside was elucidated by nmr analyses such as 1H, 13C, Corre...
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| Format: | text |
| Language: | English |
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Animo Repository
1994
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| Online Access: | https://animorepository.dlsu.edu.ph/etd_masteral/1562 https://animorepository.dlsu.edu.ph/cgi/viewcontent.cgi?article=8400&context=etd_masteral |
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| Institution: | De La Salle University |
| Language: | English |
| Summary: | Two novel monoterpene glycosides, a sesquiterpene and stigmasterol are isolated from the chloroform extract of a Philippine medicinal plant, Erigeron linifolius Willd. by repeated gravity column chromatography.The structure of the first glycoside was elucidated by nmr analyses such as 1H, 13C, Correlation spectrometry (COSY), Distortionless Enhancement by Polarization Transfer (DEPT) and mass spectrometry (MS). The structure of the second glycoside was determined by comparison of 1H, 13C and MS with the former glycoside. The identity of the sesquiterpene was established by 1H and 13C-nmr while the stigmasterol was confirmed by the equivalent 13C-spectral data with those on the literature.The Chloroform extract of the air dried leaves of Elephantopus scaber Linn. afforded six isolates which were also obtained by repeated gravity column chromatography. The structures of the compounds were elucidated by nuclear magnetic resonance spectroscopy. The isolates were identified as deoxyelephantopin, isodeoxyelephantopin, lupeol, lupeolacetate, stigmasterol and a diadinoxanthin derivative. |
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