| In vitro: |
| Phytochemistry . 2005 Feb;66(3):355-362. | | Anti-protozoal and plasmodial FabI enzyme inhibiting metabolites of Scrophularia lepidota roots[Pubmed: 15680992] | | The ethanolic root extract of Scrophularia lepidota, an endemic plant of the Turkish flora, has been investigated for its anti-protozoal and inhibitory effect towards plasmodial enoyl-ACP reductase (FabI), a key enzyme of fatty acid biosynthesis in Plasmodium falciparum. Chromatographic separation of the extract yielded 10 iridoids (1-10), two of which are new, and a known phenylethanoid glycoside (11). The structures of the new compounds were determined as 3,4-dihydro-methylcatalpol (8) and 6-O-[4''-O-trans-(3,4-dimethoxycinnamoyl)-alpha-L-rhamnopyranosyl]aucubin (scrolepidoside, 9) by spectroscopic means. The remaining metabolites were characterized as catalpol (1), 6-O-Methylcatalpol (2), aucubin (3), 6-O-alpha-L-rhamnopyranosyl-aucubin (sinuatol, 4), 6-O-beta-D-xylopyranosylaucubin (5), ajugol (6), ajugoside (7), an iridoid-related aglycone (10) and angoroside C (11). Nine isolates were active against Leishmania donovani, with the new compound 9 being most potent (IC50 6.1 microg/ml). Except for 4, all pure compounds revealed some trypanocidal potential against Trypanosoma brucei rhodesiense (IC50 values 29.3-73.0 microg/ml). Only compound 10 showed moderate anti-plasmodial (IC50 40.6 microg/ml) and FabI enzyme inhibitory activity (IC50 100 microg/ml). 10 is the second natural product inhibiting the fatty acid biosynthesis of Plasmodium falciparum. | | Nat Prod Res . 2009;23(8):775-780. | | Study of chemical composition and antimicrobial activity of leaves and roots of Scrophularia ningpoensis[Pubmed: 19418360] | | Two saponins: scrokoelziside A (1), scrokoelziside B (2), one iridoid glycoside, eurostoside (3), and two flavonoids: nepitrin (4) and homoplantaginin (5), were isolated from the leaves of Scrophularia ningpoensis for the first time. Moreover, eight known compounds: cane sugar (6), harpagide (7), aucubin (8), 6-O-Methylcatalpol (9), harpagoside (10), angoroside C (11), beta-sitosterol (12) and beta-sitosterol glucoside (13) were isolated from the roots of S. ningpoensis. Furthermore, the antimicrobial activity of the extracts of the leaves of S. ningpoensis and the 10 compounds (1, 2, 3, 4, 5, 7, 8, 9, 10, 11) was studied in vitro against eight reference strains of bacteria by using the disc-diffusion method and micro-well dilution assay. The extracts of leaves and scrokoelziside A are effective against beta-haemolytic streptococci but had no effect against other strains. The extract of roots and other compounds showed no activity against all bacterial strains at the test concentration. |
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