| In vitro: |
| Nat. Prod. Lett., 2002, 16(4):277-81. | | Antioxidant capacity of abietanes from Sphacele salviae.[Pubmed: 12168765 ] |
METHODS AND RESULTS:
Carnosol 1, rosmanol 2, carnosic acid 3 and 20-deoxocarnosol 4, the main phenolic abietanes present in aerial parts of the Chilean medicinal plant Sphacele salviae were tested for antioxidant activity of measuring the decay of the radical cation diphenyl-picrylhydrazyl (DPPH).
CONCLUSIONS:
All compounds displayed higher antioxidant levels than BHT under the same conditions and carnosic acid was more efficient than vitamin E. | | Int. J. Mol. Sci., 2014, 15(5):8360-71. | | In vitro antiprotozoal activity of abietane diterpenoids isolated from Plectranthus barbatus Andr.[Pubmed: 24823881 ] | Chromatographic separation of the n-hexane extract of the aerial part of Plectranthus barbatus led to the isolation of five abietane-type diterpenes: dehydroabietane (1); 5,6-didehydro-7-hydroxy-taxodone (2); taxodione (3); 20-Deoxocarnosol (4) and 6α,11,12,-trihydroxy-7β,20-epoxy-8,11,13-abietatriene (5).
METHODS AND RESULTS:
The structures were determined using spectroscopic methods including one- and two-dimensional NMR methods. Compounds (1)-(3) and (5) are isolated here for the first time from the genus Plectranthus. The isolated abietane-type diterpenes tested in vitro for their antiprotozoal activity against erythrocytic schizonts of Plasmodium falciparum, intracellular amastigotes of Leishmania infantum and Trypanosoma cruzi and free trypomastigotes of T. brucei. Cytotoxicity was determined against fibroblast cell line MRC-5.
CONCLUSIONS:
Compound (2) 5,6-didehydro-7-hydroxy-taxodone showed remarkable activity with acceptable selectivity against P. falciparum (IC50 9.2 μM, SI 10.4) and T. brucei (IC50 1.9 μM, SI 50.5). Compounds (3)-(5) exhibited non-specific antiprotozoal activity due to high cytotoxicity. Compound (1) dehydroabietane showed no antiprotozoal potential. |
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