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Titre : Etude phytochimique et activité antioxydante de la plante Centaurea melitensis L. Type de document : texte imprimé Auteurs : Radia Ayad, Auteur ; Kamel Medjroubi, Directeur de thèse Editeur : constantine [Algérie] : Université Constantine 1 Année de publication : 2013 Importance : 209 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles Langues : Français (fre) Catégories : Français - Anglais
ChimieTags : Astéracées Centaurea melitensis L. flavonoïdes sesquiterpènes lactones activité antioxydante Asteraceae flavonoids sesquiterpene lactones antioxidant activity الفعالية المضادةلأكسدة العائلة المركبة الفلافونيدات السيسكويتربينات اللاكتونية Index. décimale : 540 Chimie et sciences connexes Résumé :
In this work we have been interested by secondary metabolites of the Asteraceae family. Our interest has been on the sesquiterpene lactones and flavonoids descended from the genus Centaurea. Thus a deep biographic study has established a collection of familiar and new structures of these molecules.
This study from 2005 until the end of 2012 showed that 51 species have been investigated. These works mention 174 structures variously varied for both of these metabolites, with a predominance noticed for the sesquiterpene skeleton which the majorities are guainolides.
Our phytochemical and biological experimentation on the Algerian species Centaurea melitensis L. has on one hand highlight the isolation of fourteen (14) molecules (only eleven (11) have been identified): Three germacranolides in the pure state, a mixture of two elemanolides, another mixture of two elemanes, three flavonoid aglycones and a phenolic acid.
On the other hand the working up of the antioxidant of the methanolic extract of our plant.
The determination of structures has been realised by combining the results of spectrometric and spectroscopic methods ﴾EIMS, UV, NMR-1D, 2-D﴿.Diplôme : Doctorat en sciences En ligne : ../theses/chimie/AYA6349.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=6324 Etude phytochimique et activité antioxydante de la plante Centaurea melitensis L. [texte imprimé] / Radia Ayad, Auteur ; Kamel Medjroubi, Directeur de thèse . - constantine [Algérie] : Université Constantine 1, 2013 . - 209 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
ChimieTags : Astéracées Centaurea melitensis L. flavonoïdes sesquiterpènes lactones activité antioxydante Asteraceae flavonoids sesquiterpene lactones antioxidant activity الفعالية المضادةلأكسدة العائلة المركبة الفلافونيدات السيسكويتربينات اللاكتونية Index. décimale : 540 Chimie et sciences connexes Résumé :
In this work we have been interested by secondary metabolites of the Asteraceae family. Our interest has been on the sesquiterpene lactones and flavonoids descended from the genus Centaurea. Thus a deep biographic study has established a collection of familiar and new structures of these molecules.
This study from 2005 until the end of 2012 showed that 51 species have been investigated. These works mention 174 structures variously varied for both of these metabolites, with a predominance noticed for the sesquiterpene skeleton which the majorities are guainolides.
Our phytochemical and biological experimentation on the Algerian species Centaurea melitensis L. has on one hand highlight the isolation of fourteen (14) molecules (only eleven (11) have been identified): Three germacranolides in the pure state, a mixture of two elemanolides, another mixture of two elemanes, three flavonoid aglycones and a phenolic acid.
On the other hand the working up of the antioxidant of the methanolic extract of our plant.
The determination of structures has been realised by combining the results of spectrometric and spectroscopic methods ﴾EIMS, UV, NMR-1D, 2-D﴿.Diplôme : Doctorat en sciences En ligne : ../theses/chimie/AYA6349.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=6324 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité AYA/6349 AYA/6349 Thèse Bibliothèque principale Thèses Disponible Documents numériques
texte intégraleAdobe Acrobat PDFComposants et potentiel biologique de Cotula anthemoides L et Pentzia monodiana MAIRE. (Asteraceae). / Wafa Tadrent ép Laouadi
Titre : Composants et potentiel biologique de Cotula anthemoides L et Pentzia monodiana MAIRE. (Asteraceae). Type de document : texte imprimé Auteurs : Wafa Tadrent ép Laouadi, Auteur ; Zahia Kabouche, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2018 Importance : 233 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
ChimieTags : Cotula anthemoides L Pentzia monodiana Maire Asteraceae lignanes flavonoïdes sesquiterpènes lactones activité antioxydante activité anticholinesterase activité
antityrosinase sesquiterpenes lactones antioxidant activity anticholinesterase activity antityrosinase activity فلافونيدات lignanesضد الأكسدة ضد الكولينستراز و ضد التيروزينازIndex. décimale : 540 Chimie et sciences connexes Résumé : The present work concerns the phytochemical and biological studies of areal parts of two Algerian plants belonging to the Asteraceae family: Cotula anthemoides L. and Pentzia monodiana Maire. This study led to the isolation and identification of fifteen compounds of Cotula anthemoides and eight compounds of Pentzia monodiana including five phenolic acids, nine flavonoids from which one is new, three lignans, one sesquiterpene lactone, two glycosyl phenolics, a glycosyl acid, a diterpene and an nucleoside. The structural determination of the isolated compounds was established by the use of 1D and 2D NMR spectroscopic techniques (1H, 13C, COSY, HSQC, HMBC and ROESY), by mass spectrometry (ESI-MS and HRESI-MS) and by comparison with the literature data. The evaluation of the antioxidant activity by 4 methods (DPPH, ABTS, CUPRAC and chelating by ferrous ions) of the various extracts, showed a good activity of extracts from P. monodiana compared to those of C. anthemoides. Furthermore, extracts of C. anthemoides showed an interesting anticholinesterase activity. However, both of lignanes, flavonol and flavones substituted in C-3, exhibited better antityrosinase and antiradical activities than some flavones only.
Diplôme : Doctorat En ligne : ../theses/chimie/TAD7353.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11002 Composants et potentiel biologique de Cotula anthemoides L et Pentzia monodiana MAIRE. (Asteraceae). [texte imprimé] / Wafa Tadrent ép Laouadi, Auteur ; Zahia Kabouche, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2018 . - 233 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
ChimieTags : Cotula anthemoides L Pentzia monodiana Maire Asteraceae lignanes flavonoïdes sesquiterpènes lactones activité antioxydante activité anticholinesterase activité
antityrosinase sesquiterpenes lactones antioxidant activity anticholinesterase activity antityrosinase activity فلافونيدات lignanesضد الأكسدة ضد الكولينستراز و ضد التيروزينازIndex. décimale : 540 Chimie et sciences connexes Résumé : The present work concerns the phytochemical and biological studies of areal parts of two Algerian plants belonging to the Asteraceae family: Cotula anthemoides L. and Pentzia monodiana Maire. This study led to the isolation and identification of fifteen compounds of Cotula anthemoides and eight compounds of Pentzia monodiana including five phenolic acids, nine flavonoids from which one is new, three lignans, one sesquiterpene lactone, two glycosyl phenolics, a glycosyl acid, a diterpene and an nucleoside. The structural determination of the isolated compounds was established by the use of 1D and 2D NMR spectroscopic techniques (1H, 13C, COSY, HSQC, HMBC and ROESY), by mass spectrometry (ESI-MS and HRESI-MS) and by comparison with the literature data. The evaluation of the antioxidant activity by 4 methods (DPPH, ABTS, CUPRAC and chelating by ferrous ions) of the various extracts, showed a good activity of extracts from P. monodiana compared to those of C. anthemoides. Furthermore, extracts of C. anthemoides showed an interesting anticholinesterase activity. However, both of lignanes, flavonol and flavones substituted in C-3, exhibited better antityrosinase and antiradical activities than some flavones only.
Diplôme : Doctorat En ligne : ../theses/chimie/TAD7353.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11002 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité TAD/7353 TAD/7353 Thèse Bibliothèque principale Thèses Disponible
Titre : Recherche et détermination structurale des métabolites secondaires de l’espèce Centaurea microcarpa (Asteraceae). Type de document : texte imprimé Auteurs : Samia Baatouche, Auteur ; Ramdane Seghiri, Directeur de thèse Mention d'édition : 08/07/2021 Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2021 Importance : 181 f. Format : 30 cm. Note générale : 1 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
ChimieTags : Chimie organique: Phytochimie Astéracées Centaurea microcarpa Coss. & Dur. flavonoïdes sesquiterpènes lactones glycosides cyanogéniques et lignanes Asteraceae Centaurea microcarpa flavonoids sesquiterpene lactones cyanogenic glycoside lignanes العائلة المركبة Centaurea microcarpaالفلافونيدات السيسكويتربينات اللاكتونية السييانوجينيك جلوكوزيد الليجنانات Index. décimale : 540 Chimie et sciences connexes Résumé :
This work is devoted to the phytochemical study of Centaurea microcarpa Coss. and Dur. of the genus Centaurea (Asteraceae), endemic to Algeria and Tunisia. The phytochemical investigation of chloroform and ethyl acetate extracts obtained from the aerial parts of C. microcarpa, led to the isolation and identification of nine products.
The chloroform extract of this plant has permitted to isolate and identify four compounds which were: one cyanogenic glycoside, an eudesmanolide and tow steroids as a mixture each. While the ethyl acetate extract gave five compounds which were three flavonoids, one lignane and one cyanogenic. The structural elucidation of these compounds were established by modern spectroscopic methods including ultraviolet spectrophotometer, NMR spectroscopy (1H, 13C, DEPT, COSY, HSQC, HMBC and ROESY) and mass spectrometry HESI (+) and IEMS, and by comparison
with the literature data.
Note de contenu : Annexes. Diplôme : Doctorat en sciences En ligne : ../theses/chimie/BAA7824.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11656 Recherche et détermination structurale des métabolites secondaires de l’espèce Centaurea microcarpa (Asteraceae). [texte imprimé] / Samia Baatouche, Auteur ; Ramdane Seghiri, Directeur de thèse . - 08/07/2021 . - جامعة الإخوة منتوري قسنطينة, 2021 . - 181 f. ; 30 cm.
1 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
ChimieTags : Chimie organique: Phytochimie Astéracées Centaurea microcarpa Coss. & Dur. flavonoïdes sesquiterpènes lactones glycosides cyanogéniques et lignanes Asteraceae Centaurea microcarpa flavonoids sesquiterpene lactones cyanogenic glycoside lignanes العائلة المركبة Centaurea microcarpaالفلافونيدات السيسكويتربينات اللاكتونية السييانوجينيك جلوكوزيد الليجنانات Index. décimale : 540 Chimie et sciences connexes Résumé :
This work is devoted to the phytochemical study of Centaurea microcarpa Coss. and Dur. of the genus Centaurea (Asteraceae), endemic to Algeria and Tunisia. The phytochemical investigation of chloroform and ethyl acetate extracts obtained from the aerial parts of C. microcarpa, led to the isolation and identification of nine products.
The chloroform extract of this plant has permitted to isolate and identify four compounds which were: one cyanogenic glycoside, an eudesmanolide and tow steroids as a mixture each. While the ethyl acetate extract gave five compounds which were three flavonoids, one lignane and one cyanogenic. The structural elucidation of these compounds were established by modern spectroscopic methods including ultraviolet spectrophotometer, NMR spectroscopy (1H, 13C, DEPT, COSY, HSQC, HMBC and ROESY) and mass spectrometry HESI (+) and IEMS, and by comparison
with the literature data.
Note de contenu : Annexes. Diplôme : Doctorat en sciences En ligne : ../theses/chimie/BAA7824.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11656 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BAA/7824 BAA/7824 Thèse Bibliothèque principale Thèses Disponible
