Browsing by Author "Rizk, Abdel-Fattah M."
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Constituents of Plants Growing in Qatar, Part XXVI: Phytochemical investigation of Rumex vesicarius
Al Easa, Hala S.; Rizk, Abdel-Fattah M.; Hussiney, Hussiney A. (1995 , Article)The study of Rumex vesicarius revealed the isolation and identification of four anthraquinones (chrysoplanol (I), emodin (II), physcion (III) and rhein (IV) and seven flavonoids (apigenin (V), isoorientin (VI), isovitesin ... -
Fatty acid composition of twelve algae from the Coastal Zones of Qatar
Heiba, Helmi I.; Al-Easa, Hala S.; Rizk, Abdel-Fattah M. ( Kluwer Academic Publishers , 1997 , Article)Fatty acid composition of twelve algal species from two different classes were determined. Three Chlorophyta species(Axetabularia calyxulux, Cladophors sericoides and Dictyosphaeria cavernosa) and nine Phaephyta species ... -
Flavonoids from Centaurea sinaica
Al-Easa, Hala S.; Kamel, Alaa; Rizk, Abdel-Fattah M. (1992 , Article)Four Newly isolated flavonoids from Centaurea sinaica -
Guaianolides from Centaurea sinaica
Al-easa, Hala S.; Mann, John; Rizk, Abdel-Fattah ( Elsevier , 1990 , Article & Report)Three sesquiterpene lactones were isolated from the aerial parts of Centaurea sinaica: amberboin, chlorohyssopifolin A and sinaicin. The latter is reported for the first time. -
Guaianolides from Picris radicata
Al-Easa, Hala S.; Rizk, Abdel-Fattah M.; Ahmed, Ahmed A. ( Elsevier Science Ltd. , 1996 , Article)The methylene chloride-methanol (1:1) extract of the aerial parts of Picris radicata Forssk afforded two new guaianolides. The structures were established from spectral data. -
Triterpenoids from Salvia aegyptiaca
Bruno, Maurizio; Ciriminna, Rosaria; Al-Easa, Hala S.; Rizk, Abdel-Fattah M. (1993 , Article)Newly isolated secondary metabolites from Salvia aegyptiaca growing in Qatar