Browsing by Author "Al Easa, Hala S."

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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 ...

    • Major sterol composition of some algae from Qatar 

      Al Easa, Hala S.; Kornprobst, Jean-Michel; Rizk, A.M. ( Elsevier Science Ltd. , 1995 , Article)
      Thirteen macroscopic algae belonging to the three main divisions Chlorophyceae, Rhodophyceae and Phaeophyceae from the coast of Qatar (Arabian Gulf) were investigated for their sterol composition by using GC-MS coupling ...

    • Volatile Components of the Phaeophyceae Hormophysa cuneiformis Growing Along Qatar Coasts 

      El Hattab, M.; Al Easa, Hala S.; Tabaries, Annie; Kornprobst, Jean-Michel; Piovetti, Louis; الحطاب, محمد; العيسى, هالة سلطان; تبريس, آني; كورنبروبست, جين ميشيل; بيوفيتي, لويس... more authors ( Qatar University , 2007 , Article)
      The present work deals with the study on volatile compounds from the brown alga Hormophysa cuneiformis collected from the Northwest coast of Qatar on May 2002. Two extraction methods have been used: conventional hydrodistillation ...