Browsing by Author "Hassan, N. M."
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Comparative studies of the oil from silybum marianum cultivated in Egypt using glc
Hammouda, F. M. [فايزة محمود حمودة]; Ismail, S. I.; Hassan, N. M.; Zaki, A. K. ( Qatar University , 1994 , Article)Quantitative comparative study of the oil fraction constituents in the fruits of Silybum marianum successfully cultivated in new reclaimed land with those of the two wild types viz., purple flower and white flower bearing ... -
Constituents of plants growing in Qatar - Part XIX. Flavonoids of Glossonema edule N. E. Br.
Rizk, A. M.; Hammouda, F. M.; Ismail, S. I.; Hassan, N. M.; El-Missiry, M. M.; Ahmad, F. A.... more authors ... less authors ( Springer Nature , 1990 , Article)The study of the flavonoids of the unripe fruits of Glossonema edule, resulted in the isolation and identification of apigenin 6,8-di-C-glucoside (violanthin) and luteolin 7-O-glucoside. © 1990 Kluwer Academic Publishers. -
Constituents of plants growing in Qatar part XV. Chemical investigation and pharmacotoxicity of pyrrolizidine alkaloids of moltikiopsis ciliata
Rizk, A. M.; Hammouda, F. M.; Ismail, S. I.; Hassan, N. M.; Hosseiny, H. A.; Roeder, E.; Wiedenfeld, H.; Ghaleb, H. A.; Madkour, M. K.... more authors ... less authors ( Taylor & Francis , 1988 , Article)Chemical study of the alkaloidal constituents of Moltikiopsis ciliata resulted in the isolation and identification of heliotrine and echinatine, in addition to other minor alkaloids. Pharmacological experiments revealed: ... -
Constituents of plants growing in Qatar XX. Phytochemical investigation of anastatica hierochuntica: NOTE
Rizk, A. M.; Hammouda, F. M.; Ismail, S. I.; Hassan, N. M.; Ahmed, F. A. ( Taylor & Francis , 1993 , Article)A study of the lipid fraction of Anastatica hierochuntica (Cruciferae) resulted in the isolation of hydrocarbon (mainly C25H52, C29H60 AND C31H64) AND sterol fractions (P-sitosterol, campesterol, stigmasterol AND cholesterol). ... -
Methylated Flavonoids From Artemisia Monosperma
Ismail, S. I. [شمس الدين امبابي اسماعيل]; Hammouda, F. M.; Rizk, A. M.; Hassan, N. M. ( Qatar University , 1989 , Article)Investigation of the flavonoid constituents of Artemisia monosperma resulted in the isolation and identification of four methylated flavonoids: quercetin 3,3',4'-trimethylether, diosmetin (luteolin 4'-methylether), ... -
Occurrence of pyrrolizidine alkaloids in Heliotropium bacciferum Forssk. Constituents of plants growing in Qatar XIII
Rizk, A. M.; Hammouda, F. M.; Roder, E.; Wiedenfeld, H.; Ismail, S. I.; Hassan, N. M.; Hosseiny, H. A.... more authors ... less authors (1988 , Article)N/A. -
Pyrrolizidine alkaloids from alkanna orientalis (L.) Boiss
Hammouda, F. M. [فايزة محمود حمودة]; Ismail, S. I.; Hassan, N. M.; Tawfiq, W. A.; Kamel, A. ( Qatar University , 1992 , Article)Three pyrrolizidine alkaloids; 7-angelyl retronecine (I), 9-angelyl retronescine (II), and dihydroxytriangularine (III) were isolated by DCCC and VLC from Alkanna orientalis growing in Egypt. Their structures were elucidated ... -
Pyrrolizidine alkaloids from heliotropium arbainense and h. Ovalifolium
Rizk, A. M. [عبد الفتاح محمد رزق]; Hammouda, F. M.; Hassan, N. M. ( Qatar University , 1991 , Article)Investigation of the pyrrolizidine alkaloids of Heliotropium arbainense resulted in the isolation and identification of heliotrine, europine and 7-angelylheliotrine. From H. ovalifolium three alkaloids were isolated: ... -
Pyrrolizidine Alkaloids From Senecio Aegyptius L.
Rizk, A. M. [عبد الفتاح محمد رزق]; Hammouda, F. M.; Ismail, S. I.; Hassan, N. M. ( Qatar University , 1988 , Article)Investigation of the alkaloidal constituents of Senecio aegyptius L. resulted in the isolation and identification of senecionine, dehydrosenkirkine and probably an isomer of seneciphylline. TLC, HPLC and GLC showed the ...