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Molecules. 2012 Nov 1;17(11):12895-909. doi: 10.3390/molecules171112895.

Secondary metabolites from two species of Tolpis and their biological activities.

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  • 1Departamento de Química, Unidad Asociada al CSIC, Universidad de Las Palmas de Gran Canaria, Las Palmas de Gran Canaria, Spain.


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-dihydroxy-11α-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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