title: A weakly antimalarial biflavanone from Rhus retinorrhoea.
abstract: The biflavanone (2S,2"S)-7,7"-di-O-methyltetrahydroamentoflavone and five known flavonoids, 7-O-methylnaringenin, 7,3'-O-dimethylquercetin, 7-O-methylapigenin, 7-O-methylluteolin, and eriodictyol were isolated from the leaves of Rhus retinorrhoea Steud, Ex Olive. The biflavanone exhibited moderate antimalarial activity with IC50 0.98 microg/ml against Plasmodium falciparum (W2 Clone) and weak activity against P. falciparum (D6 Clone) with IC50 2.8 microg/ml. Nevertheless, it did not display any cytotoxicity. 7-O-Methylnaringenin showed weak antimicrobial activity against Candida albicans, C. krusei, Staphylococcus aureus, Mycobacterium smegmatis, M. intracellulare, and M. xenopi with MIC approximately 100 microg/ml. Characterization of each compound was based on spectral analysis and comparison with reported data.
authors.affiliation: Department of Pharmacognosy, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia.
authors.forename: M S
authors.initials: MS
authors.lastname: Ahmed
authors.forename: A M
authors.initials: AM
authors.lastname: Galal
authors.forename: S A
authors.initials: SA
authors.lastname: Ross
authors.forename: D
authors.initials: D
authors.lastname: Ferreira
authors.forename: M A
authors.initials: MA
authors.lastname: ElSohly
authors.forename: A S
authors.initials: AS
authors.lastname: Ibrahim
authors.forename: J S
authors.initials: JS
authors.lastname: Mossa
authors.forename: F S
authors.initials: FS
authors.lastname: El-Feraly
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents; D000890:Anti-Infective Agents / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D000962:Antimalarials / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D044946:Biflavonoids; D002175:Candida / Q000187:drug effects; D005419:Flavonoids / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D008826:Microbial Sensitivity Tests; D015394:Molecular Structure; D009161:Mycobacterium / Q000187:drug effects; D010963:Plasmodium falciparum / Q000187:drug effects; D029045:Rhus / Q000737:chemistry*; D013057:Spectrum Analysis; D013211:Staphylococcus aureus / Q000187:drug effects
chemical_list: D000900:Anti-Bacterial Agents; D000890:Anti-Infective Agents; D000962:Antimalarials; D044946:Biflavonoids; D005419:Flavonoids; C442174:biflavanone (2S,2''S)-7,7''-di-O-methyltetrahydroamentoflavone