C-Prenylated flavonoids in Philippine propolis from nests of stingless bee (tetragonula biroi friese)
The dichloromethane extract of Philippine propolis from nests of Tetragonula biroi Friese, collected in Sorsogon, afforded two C-prenylated flavonoids: the flavanone Propolin H or Macarangaflavanone A (TB-4), and the dihydroxyflavonol Glyasperin A (TB-1), along with six known triterpenes: a mixture...
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| Format: | text |
| Language: | English |
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Animo Repository
2014
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| Online Access: | https://animorepository.dlsu.edu.ph/etd_masteral/4689 |
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| Institution: | De La Salle University |
| Language: | English |
| Summary: | The dichloromethane extract of Philippine propolis from nests of Tetragonula biroi Friese, collected in Sorsogon, afforded two C-prenylated flavonoids: the flavanone Propolin H or Macarangaflavanone A (TB-4), and the dihydroxyflavonol Glyasperin A (TB-1), along with six known triterpenes: a mixture of a-amyrin (TB-2a), b-amyrin (TB-2b), and lupeol (TB-2b), and a mixture of urs-12-ene-3-one (TB-6a), olean-12-ene-3-one (TB-6b), and lupenone (TB-6c). The structures TB-4 and TB-1 were elucidated using 1D and 2D NMR spectroscopy. Stereochemistry of TB-4 was determined using CD spectroscopy. This the first report on the isolation of Glyasperin A from propolis. Furthermore, this is the first report on the isolation of secondary metabolites in Philippine propolis. |
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