Chemosystematic studies of some species of the genus potamogeton L. in Egypt

Morphological, anatomical and a phytochemical studies were conducted on four out of seven potamogeton L. species recorded in the flora of Egypt. The stem anatomy referred to the presence of three types of steles and three types of endodermis. The chemical investigation revealed the presence of eleven flavonoid compounds, the distribution of which was traced in the studied species to evaluate the interspecific affinity through this parameter It was found that the chemical data in this work justify the classification of ascherson and graebner [1907] as regards the assignment of the four studied species to their sections. A key based on a combination of the anatomical and chemical characters was suggested for species delimitation

Flavonoids of Lotus hebranicus and ulceroprotective effect of Lotus hebranicus and Lotus corniculatus

From the aerial parts of Lotus hebranicus L. Hochst ex Brand a total of seven flavonoid compounds were isolated and identified as: Kaempferol- 3-0- sophoroside -7-0-rhamnoside, kaempferol-3-0-sophoroside, isorhamnetin-3-0-glucoside-7-0-rhamnoside kaempferol-3,7-di-0-rhamnoside, kaempferol-7-0-rhamnoside, isorhamnetin and kaempferol. A study of toxicological and ulceroprotective effects was performed for both Lotus hebranicus L. Hochst ex Brand and Lotus corniculatus L

Flavonoids of retama raetam, and in vitro antitumor screening of two isoflavones

From the aerial parts of Retama raefam ten flavonoids were isolated and identified as saponarin, genistein 8-C-glucoside, genistein 5-O- methylether, genistein 5,4'-di-O-methylether, alpuminoisoflavone, ephedroidin, luteolin, apigenin and two new flavones, luteolin 4'-O- neohesperidoside and 5,4'-dihydroxy- [3",4''- dihydro- [3",4"-dihdroxy] -2",2"dimethylpyrano [5",6":7,8]-flavone[1]. In vitro antitumor screening of genistein-5-O-methylether and genistein-8-C-glucoside were carried out on sixty human tumor cell lines

Chemical constituents and biological activity of some Egyptian members of the leguminosae

Preliminary phytochemical screening was carried Out for the three plants under investigation: Colutea istria, Alhagi graecorum and Astragalus vogelii Sixteen flavonoidal compounds were isolated and identified as:quercetin-3-glucoside; quercetin-3-gentiobioside; quercetin-3,7-diglucoside; isorhamnetm-3-gentiobioside; isorhamnetin-3-rutinoside;kaempferide-3,7-diglucoside; 2',4,4'trihydroxychalcone; 2',4,4',6' tetrahydroxychalcone; formononetin; daidzein; calycosin; cladrin; rhamnocitrin-3-neohesperidoside; rhamnocitrin-3-glucoside; thamnocitrin-3-galactoside and rhamnocitrin aglycone. The volatile constituents were analysed by GC/MS spectrometry, the effect of the alcoholic extracts on the brine shrimp and the antimicrobial activity were carried out

Influence of storage on chemical composition and antimicrobial activity of coriander [coriandrum sativum L.] Honey

The influence of storage on the antimicrobial activity and chemical composition of coriander honey was investigated. Staphylococcus aureus, Escherichia coli and Candida albicans were used for antimicrobial assay of the fresh and stored coriander honey. It was clear that fresh or stored crude coriander honey showed a higher antibacterial activity if compared with n-hexane extract. It was obvious that fresh coriander honey and its n- hexane extract were effective against different examined pathogens. Staphylococcus aureus was the most affected bacteria by both fresh and stored coriander honey as well as their n-hexane extracts. The stored honey extracted with n- hexane showed the highest antifungal activity against Candida albicans. Comparative gas chromatography - mass spectrometry [GC/MS] study of the fresh and stored Coriander honey revealed that the storage produced a significant decrease in the amounts of mono-, sesqui- and diterpens, fatty acid octyl esters, antibacterial, antifungal activity and produced a significant increase in the amounts of fatty acid ethyl esters. 1- hydroxylinalool, benzenemethanol 3,4- dimethoxy and oleic acid showed the highest significant concentration. Few fatty acids, fatty acid esters and alkanols, alkanals and alkanones are also present

chemosystematics of Egyptian onopordum species [compositae]

From the leaves and stems of Onopordum alexandrinum, 11 flavonoid compounds were isolated and identified as apigenin, luteolin, chrysoeriol and their 7-galactosides and 7-glucosides together with the 7-diglucosides of apigenin and chrysoeriol