Secondary metabolites from two species of Tolpis and their biological activities
Phytochemical research of two Tolpis species, T. proustii and T. lagopoda, led to the isolation of three new compounds: 30-chloro-3β-acetoxy-22α-hydroxyl-20(21)- taraxastene (1), 3β,22α-diacetoxy-30-ethoxy-20(21)-taraxastene (2) and 3β,28-dihydroxy11α-hydroperoxy-12-ursene (3). The structures of the new compounds were elucidated by means of extensive IR, NMR, and MS data and by comparison of data reported in the literature. The in vitro antioxidant activities of the extracts were assessed by the DPPH and ABTS scavenging methods. The cytotoxicity of several known compounds and its derivatives was also assessed against human myeloid leukemia K-562 and K-562/ADR cell lines.
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| Principais autores: | , , , , , , , , |
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| Outros Autores: | |
| Publicado em: |
Multidisciplinary Digital Publishing Institute
2012-11-01
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| Assuntos: | Asteraceae, Tolpis proustii, Tolpis lagopoda, Ursane-triterpenes, Taraxastane-triterpenes, |
| Acesso em linha: | http://hdl.handle.net/10261/157725 http://dx.doi.org/10.13039/501100004837 http://dx.doi.org/10.13039/501100007757 http://dx.doi.org/10.13039/501100000780 |
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