Résultat de la recherche
8 recherche sur le tag
'Essential oils' 
Affiner la recherche Générer le flux rss de la recherche
Partager le résultat de cette recherche Interroger des sources externesEffets des antioxydants naturels issus de Pituranthos scoparius et Hibiscus sabdariffa sur la stabilité oxydative d’émulsions à base de lactosérum et la cristallisation des lipides. / Anis Chikhoune
Titre : Effets des antioxydants naturels issus de Pituranthos scoparius et Hibiscus sabdariffa sur la stabilité oxydative d’émulsions à base de lactosérum et la cristallisation des lipides. Type de document : texte imprimé Auteurs : Anis Chikhoune, Auteur ; Abdelghani Boudjellal, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2019 Importance : 323 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
Nutrition, Alimentation et Technologies Agro-AlimentairesTags : Technologies Alimentaires: Sciences Alimentaires extraits phénoliques bruts huiles essentielles Pituranthos scoparius Hibiscus sabdariffa émulsion lactosérum stabilité oxydative interactions protéine-polyphénols monoterpènes cristallisation crude phenolic extracts essential oils emulsion whey oxidative stability protein-polyphenol interactions monoterpenes crystallization مستخلصات فينولية خام زيوت أساسية مستحلب مصل اللبن الاستقرار التأكسدي تفاعلات البروتين-البوليفينول مونوتربين التبلور Index. décimale : 640 Industrie Alimentaire Résumé : Nowadays, antioxidants have a significant impact on both human health and food processing. This thesis sheds the light on the action of these antioxidants on the oxidative stability of a whey-based spread-type emulsion, but also the crystallization of fats in the fatty phase. The crude phenolic extracts of Pituranthos scoparius and Hibiscus sabdariffa and the essential oils of the aerial parts of P. scoparius were studied. These extracts were obtained via conventional extraction techniques (decoction and hydrodistillation) and non-conventional techniques (microwaves and ultrasounds). Spectrophotometric assays were performed for the assessment of the contents of total phenolics in the crude extracts studied. Various chromatographic
techniques have been performed for the characterization and identification of the different classes of antioxidants. The antioxidant activity was studied by the tests of reducing power and antiradical activity. Different emulsions were formulated at both laboratory and pilot scales, incorporated by the concentrated crude phenolic extracts of the plants and the essential oil from stems of P. scoparius at different concentrations. Their oxidative stability was evaluated by Rancimat test. The two phases of the emulsion have been studied regarding two aspects: whey protein-polyphenol interactions in the aqueous phase and lipid crystallization in the fatty phase containing palm, soybean and sunflower oils. A Tricine SDS-PAGE was performed in the former and a set of investigation techniques for the study of isothermal crystallization (DSC, p-NMR and PLM) in the latter were applied. The results of spectrophotometric, chromatographic and antioxidant activity corroborate with those of oxidative stability and showed a protective effect against lipid oxidation at low concentrations of plant crude extracts (100 and 300 ppm) and the essential oil of P. scoparius (100 ppm). The sensory evaluation of the spread at 100, 300 and 600 ppm of the essential oil of P. scoparius, with a principal component analysis (PCA), revealed the influence of some sensory attributes on the segregation of emulsions at these different concentrations. The interactions of caseins and β-Lactoglobulin with polyphenols in the aqueous phase, with the formation of characteristic dimers, were revealed by densitometry and LC-MS/MS analysis. The formation of these dimers did not affect in any case the oxidative stability of the emulsions tested. The study of the effect of essential oils of stems and flowers of P. scoparius on lipid crystallization (palm oil alone and a mixture of the oils) showed a change in isothermal crystallization behavior of triglycerides with a delay of crystallization, a decrease in calculated enthalpies of fusion, slower crystallization rates and a drastic decrease in solid fat contents (SFC). This modification is also noticeable and different shapes and sizes of triglyceride crystals (spherulites) were visualized for fats with essential oils compared to control ones. The induction of a dilution effect of the system by the essential oils is discarded and the hypothesis of the implication of major monoterpenes in disturbing the crystallization events (nucleation and crystal growth) is proposed. From this study, it can be concluded that the recovery and industrial exploitation of the two plants studied is strongly encouraged, especially for P. scoparius which is already exploited in the Algerian traditional pharmacopoeia and food preservation. In addition to the antioxidant effects reported for the essential oil, it is suggested the possibility of its use as a natural additive to modify fat crystallization for applications in shortenings and various food emulsions.
Diplôme : Doctorat en sciences En ligne : ../theses/agronomie/CHI7488.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11320 Effets des antioxydants naturels issus de Pituranthos scoparius et Hibiscus sabdariffa sur la stabilité oxydative d’émulsions à base de lactosérum et la cristallisation des lipides. [texte imprimé] / Anis Chikhoune, Auteur ; Abdelghani Boudjellal, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2019 . - 323 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
Nutrition, Alimentation et Technologies Agro-AlimentairesTags : Technologies Alimentaires: Sciences Alimentaires extraits phénoliques bruts huiles essentielles Pituranthos scoparius Hibiscus sabdariffa émulsion lactosérum stabilité oxydative interactions protéine-polyphénols monoterpènes cristallisation crude phenolic extracts essential oils emulsion whey oxidative stability protein-polyphenol interactions monoterpenes crystallization مستخلصات فينولية خام زيوت أساسية مستحلب مصل اللبن الاستقرار التأكسدي تفاعلات البروتين-البوليفينول مونوتربين التبلور Index. décimale : 640 Industrie Alimentaire Résumé : Nowadays, antioxidants have a significant impact on both human health and food processing. This thesis sheds the light on the action of these antioxidants on the oxidative stability of a whey-based spread-type emulsion, but also the crystallization of fats in the fatty phase. The crude phenolic extracts of Pituranthos scoparius and Hibiscus sabdariffa and the essential oils of the aerial parts of P. scoparius were studied. These extracts were obtained via conventional extraction techniques (decoction and hydrodistillation) and non-conventional techniques (microwaves and ultrasounds). Spectrophotometric assays were performed for the assessment of the contents of total phenolics in the crude extracts studied. Various chromatographic
techniques have been performed for the characterization and identification of the different classes of antioxidants. The antioxidant activity was studied by the tests of reducing power and antiradical activity. Different emulsions were formulated at both laboratory and pilot scales, incorporated by the concentrated crude phenolic extracts of the plants and the essential oil from stems of P. scoparius at different concentrations. Their oxidative stability was evaluated by Rancimat test. The two phases of the emulsion have been studied regarding two aspects: whey protein-polyphenol interactions in the aqueous phase and lipid crystallization in the fatty phase containing palm, soybean and sunflower oils. A Tricine SDS-PAGE was performed in the former and a set of investigation techniques for the study of isothermal crystallization (DSC, p-NMR and PLM) in the latter were applied. The results of spectrophotometric, chromatographic and antioxidant activity corroborate with those of oxidative stability and showed a protective effect against lipid oxidation at low concentrations of plant crude extracts (100 and 300 ppm) and the essential oil of P. scoparius (100 ppm). The sensory evaluation of the spread at 100, 300 and 600 ppm of the essential oil of P. scoparius, with a principal component analysis (PCA), revealed the influence of some sensory attributes on the segregation of emulsions at these different concentrations. The interactions of caseins and β-Lactoglobulin with polyphenols in the aqueous phase, with the formation of characteristic dimers, were revealed by densitometry and LC-MS/MS analysis. The formation of these dimers did not affect in any case the oxidative stability of the emulsions tested. The study of the effect of essential oils of stems and flowers of P. scoparius on lipid crystallization (palm oil alone and a mixture of the oils) showed a change in isothermal crystallization behavior of triglycerides with a delay of crystallization, a decrease in calculated enthalpies of fusion, slower crystallization rates and a drastic decrease in solid fat contents (SFC). This modification is also noticeable and different shapes and sizes of triglyceride crystals (spherulites) were visualized for fats with essential oils compared to control ones. The induction of a dilution effect of the system by the essential oils is discarded and the hypothesis of the implication of major monoterpenes in disturbing the crystallization events (nucleation and crystal growth) is proposed. From this study, it can be concluded that the recovery and industrial exploitation of the two plants studied is strongly encouraged, especially for P. scoparius which is already exploited in the Algerian traditional pharmacopoeia and food preservation. In addition to the antioxidant effects reported for the essential oil, it is suggested the possibility of its use as a natural additive to modify fat crystallization for applications in shortenings and various food emulsions.
Diplôme : Doctorat en sciences En ligne : ../theses/agronomie/CHI7488.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11320 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité CHI/7488 CHI/7488 Thèse Bibliothèque principale Thèses Disponible
Titre : Etude phytochimique et pharmacologique de deux plantes sahariennes : Helianthemum Lippii et Cymbopogon schoenanthus. Type de document : texte imprimé Auteurs : Nihed Djemam, Auteur ; Samir Benayache, Auteur Mention d'édition : 18-nov-20 Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2020 Importance : 197 f. Format : 30 cm. Note générale : Doctorat 3éme CYCLE LMD.
1 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
ChimieTags : Chimie: Chimie organique Chimie organique : Analyses physicochimiques, contrôle de la qualité et synthèse de substances bioactives Helianthemum lippii Cymbopogon schoenanthus séparations chromatographiques méthodes spectroscopiques huiles essentielles analyse HPLC-TOF/MS activité antioxydante activité anticancéreuse colon distal du rat effet relaxant chromatographic separations spectroscopic methods essential oils HPLC-TOF / MS analysis antioxidant activity anticancer activity rat distal colon relaxing effect التحليـل الكرمـاتوغرافي طرق التحليل الطيفـي الزيوت الأساسية النشاط المضادة للأكسدة النشـاط المضاد للسرطان القولون النازل تـحليل HPLC-TOF/MS تأثير الاسترخاء Index. décimale : 540 Chimie et sciences connexes Résumé :
This work is devoted to the phytochemical, biological and pharmacological study of two endemic Saharan species; Helianthemum lippii (Cistaceae) and Cymbopogon schoenanthus (Poaceae). The extraction of the two species followed by the chromatographic separations (CC, CCM and HPLC semi-preparative), led to isolate and identify using spectroscopic methods (1D and 2D NMR) 6 compounds among which two sterols, as well as four sesquiterpenes: Stigmasterol, β- Sitosterol, (1S,4aa)-4Methylene-6-(1-hydroxy-&-methyethyl)-8a-b-methyl-decahydroxydronaphtalene-Ab-ol 1S, 7S, 10S, eudesm-4(14)-en-1α-11α-diol(hydroxy-β-eudesmol), 4α, 11-dihydroxy-7-epimereudesmandiol (7-epi-cryptomeridiol), 4β, 7β, 11-enantioeudesmantriol (Pterodontriol), 4β,6β,10α-trihydroxy guaiane sesquiterpène (Teuclatriol). Chromatographic analysis of the essential oils of Cymbopogon schoenanthus showed that the hydrocarbons represented 26.7% while the sesquiterpene fraction reached 40%. The HPLC-TOF / MS analysis of the AcOEt and n-BuOH extracts of the two species suggested the presence of 32 phenolic acids and flavonoids which were present in different proportions The efficacy of inhibiting DNA damage and the evaluation of the anticancer activity carried out on the EtOAc and n-BuOH extracts of the two species demonstrated a particularity observed in Helianthemum lippii on the antioxidant effect and thus the antiproliferative effect. The pharmacological study was carried out on the effect of the extracts on the distal colon of Wistar rats; which have shown a marked relaxing effect on the isolated distal colon of the rat which could represent an underlying mechanism for the traditional use of these plants for gastrointestinal conditions. Further studies will help us understand the metabolites responsible for the effect and mechanism involved.
Note de contenu :
Annexes.Diplôme : Doctorat En ligne : ../theses/chimie/DJE7702.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11536 Etude phytochimique et pharmacologique de deux plantes sahariennes : Helianthemum Lippii et Cymbopogon schoenanthus. [texte imprimé] / Nihed Djemam, Auteur ; Samir Benayache, Auteur . - 18-nov-20 . - جامعة الإخوة منتوري قسنطينة, 2020 . - 197 f. ; 30 cm.
Doctorat 3éme CYCLE LMD.
1 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
ChimieTags : Chimie: Chimie organique Chimie organique : Analyses physicochimiques, contrôle de la qualité et synthèse de substances bioactives Helianthemum lippii Cymbopogon schoenanthus séparations chromatographiques méthodes spectroscopiques huiles essentielles analyse HPLC-TOF/MS activité antioxydante activité anticancéreuse colon distal du rat effet relaxant chromatographic separations spectroscopic methods essential oils HPLC-TOF / MS analysis antioxidant activity anticancer activity rat distal colon relaxing effect التحليـل الكرمـاتوغرافي طرق التحليل الطيفـي الزيوت الأساسية النشاط المضادة للأكسدة النشـاط المضاد للسرطان القولون النازل تـحليل HPLC-TOF/MS تأثير الاسترخاء Index. décimale : 540 Chimie et sciences connexes Résumé :
This work is devoted to the phytochemical, biological and pharmacological study of two endemic Saharan species; Helianthemum lippii (Cistaceae) and Cymbopogon schoenanthus (Poaceae). The extraction of the two species followed by the chromatographic separations (CC, CCM and HPLC semi-preparative), led to isolate and identify using spectroscopic methods (1D and 2D NMR) 6 compounds among which two sterols, as well as four sesquiterpenes: Stigmasterol, β- Sitosterol, (1S,4aa)-4Methylene-6-(1-hydroxy-&-methyethyl)-8a-b-methyl-decahydroxydronaphtalene-Ab-ol 1S, 7S, 10S, eudesm-4(14)-en-1α-11α-diol(hydroxy-β-eudesmol), 4α, 11-dihydroxy-7-epimereudesmandiol (7-epi-cryptomeridiol), 4β, 7β, 11-enantioeudesmantriol (Pterodontriol), 4β,6β,10α-trihydroxy guaiane sesquiterpène (Teuclatriol). Chromatographic analysis of the essential oils of Cymbopogon schoenanthus showed that the hydrocarbons represented 26.7% while the sesquiterpene fraction reached 40%. The HPLC-TOF / MS analysis of the AcOEt and n-BuOH extracts of the two species suggested the presence of 32 phenolic acids and flavonoids which were present in different proportions The efficacy of inhibiting DNA damage and the evaluation of the anticancer activity carried out on the EtOAc and n-BuOH extracts of the two species demonstrated a particularity observed in Helianthemum lippii on the antioxidant effect and thus the antiproliferative effect. The pharmacological study was carried out on the effect of the extracts on the distal colon of Wistar rats; which have shown a marked relaxing effect on the isolated distal colon of the rat which could represent an underlying mechanism for the traditional use of these plants for gastrointestinal conditions. Further studies will help us understand the metabolites responsible for the effect and mechanism involved.
Note de contenu :
Annexes.Diplôme : Doctorat En ligne : ../theses/chimie/DJE7702.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11536 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité DJE/7702 DJE/7702 Thèse Bibliothèque principale Thèses Disponible
Titre : Etudes phytochimique et pharmacologique d’une plante saharienne et d’espèces de la région des Aurès. Type de document : texte imprimé Auteurs : Hamza Fadel, Auteur ; Samir Benayache, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2018 Importance : 255 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
ChimieTags : Pulicaria inuloides Cistus albidus les Aurès fractionnement bioguidé activité biologique flavonoïdes huiles essentielles ICP-AES et ICP-MS Aures bioguided fractionation biological activity flavonoids essential oils Pulicaria inuloidesالأوراس الفعالية البيولوجية الفصل الموجه بيولوجيا الزيوت العطرية التحليل الطيفي للانبعاث الذري ) (ICP-AESالتحليل الطيفي الكتلي )(. ICP-M" Index. décimale : 540 Chimie et sciences connexes Résumé : Our goal in this work was to search the secondary metabolites of flavonoids type from two species from Asteraceae and Cistaceae families in order to search new natural compounds of biological interest. Thirteen (13) extracts from different species including twelve (12) from the Aures regions were subjected to a phytochemical screening. On the basis of these preliminary results, the phytochemical investigation of the aerial parts two species, Pulicaria inuloides and Cistus albidus from the Bechar and the Aures regions respectively was carried out. This approach allowed the isolation of twelve natural compounds, among which eleven flavonoids, one phenolic compound as well as two acetyl derivatives of one of the isolated compounds were characterized using spectroscopic methods such as UV-Visible, IR and NMR.
The biological activities in vitro (antioxidant and antibacterial activity) as well as the total phenolic and flavonoids compounds of the various extracts were discussed. We also reported the evaluation of the in vitro antiprotozoal activity of the two species Pulicaria inuloides and Cistus albidus against Leishmania amazonensis, Trypanosoma cruzi and Acanthamoeba castellanii str. Neff. The bioguided fractionation of the CHCl3 extract from the aerial part of P. inuloides leads to the isolation and characterization of quercetagetin-3,5,7,3'-tetramethylether as the active ingredient. Two acetylated derivatives were prepared from this natural compound and these three compounds were evaluated for their activities against the promastigote form of L. amazonensis.
All these compounds exhibited moderate leishmanicidal activity with IC50 values ranging from 0.234 to 0.484 mM and low toxicity to macrophage cells (CC50 ranging from 0.365 to 0.664 mM). This study reported the antiprotozoal evaluation of Pulicaria inuloides for the first time and the results show that this species can be considered as a source of anti-leishmanicidal agents. The bioguided fractionation of the active extract of CHCl3 from C. albidus against T. cruzi led to the isolation of two fractions F6,4 and F6,5 which showed also a potent activity up to 100 μg/ml. The bioguided fractionation of the active extract of AcOEt from the aerial part of C. albidus against A. castellanii led to the isolation of a fraction F14A which showed a significant activity up to 100 μg / ml. Fractions F6,4 ; F6,5 and F14A consists of product mixtures, which have not been separated.
We have also described the chemical compositions of the essential oils of Pulicaria inuloides and Cistus albidus. The major compounds of the species C. albidus are manool and 15,16-dinorlabd-8(20)- en-13-one whose skeleton of type labdane is a specific marker in this genus, these compounds are not described in samples from other regions and in particular in the Mediterranean regions (Spain and France) that appeared in the literature. The major compounds of the species Pulicaria inuloides are: δ- cadinene, α-muurolene, γ-cadinene, α-epi-cadinol and α-cadinol are not present in the other samples of Pulicaria inuloides from other areas published in the literature.
In this study, the mineral content (inorganic elements) of 21 isolated extracts of various aromatic species of the Sahara (P. inuloides) and the Aures region (Euphorbia helioscopia L., Peganum harmala L., Daphne gnidium L., Calendula algeriensis L., Bunium incrassatum L., Echinops ritro L. Marrubium deserti de Noè., Juniperus oxycedrus L., Juniperus phoenicea L., Marrubium vulgare L., Cedrus atlantica (Endl.) Manetti and Thymus algeriensis L.) were also determined by inductively coupled plasma atomic emission spectroscopy (ICP-AES) and inductively coupled plasma mass spectroscopy (ICP-MS) . The results obtained showed higher concentrations of Ca, K, Mg, Na and S
(mg/kg) in the different plant extracts.
Diplôme : Doctorat En ligne : ../theses/chimie/FAD7287.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10902 Etudes phytochimique et pharmacologique d’une plante saharienne et d’espèces de la région des Aurès. [texte imprimé] / Hamza Fadel, Auteur ; Samir Benayache, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2018 . - 255 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
ChimieTags : Pulicaria inuloides Cistus albidus les Aurès fractionnement bioguidé activité biologique flavonoïdes huiles essentielles ICP-AES et ICP-MS Aures bioguided fractionation biological activity flavonoids essential oils Pulicaria inuloidesالأوراس الفعالية البيولوجية الفصل الموجه بيولوجيا الزيوت العطرية التحليل الطيفي للانبعاث الذري ) (ICP-AESالتحليل الطيفي الكتلي )(. ICP-M" Index. décimale : 540 Chimie et sciences connexes Résumé : Our goal in this work was to search the secondary metabolites of flavonoids type from two species from Asteraceae and Cistaceae families in order to search new natural compounds of biological interest. Thirteen (13) extracts from different species including twelve (12) from the Aures regions were subjected to a phytochemical screening. On the basis of these preliminary results, the phytochemical investigation of the aerial parts two species, Pulicaria inuloides and Cistus albidus from the Bechar and the Aures regions respectively was carried out. This approach allowed the isolation of twelve natural compounds, among which eleven flavonoids, one phenolic compound as well as two acetyl derivatives of one of the isolated compounds were characterized using spectroscopic methods such as UV-Visible, IR and NMR.
The biological activities in vitro (antioxidant and antibacterial activity) as well as the total phenolic and flavonoids compounds of the various extracts were discussed. We also reported the evaluation of the in vitro antiprotozoal activity of the two species Pulicaria inuloides and Cistus albidus against Leishmania amazonensis, Trypanosoma cruzi and Acanthamoeba castellanii str. Neff. The bioguided fractionation of the CHCl3 extract from the aerial part of P. inuloides leads to the isolation and characterization of quercetagetin-3,5,7,3'-tetramethylether as the active ingredient. Two acetylated derivatives were prepared from this natural compound and these three compounds were evaluated for their activities against the promastigote form of L. amazonensis.
All these compounds exhibited moderate leishmanicidal activity with IC50 values ranging from 0.234 to 0.484 mM and low toxicity to macrophage cells (CC50 ranging from 0.365 to 0.664 mM). This study reported the antiprotozoal evaluation of Pulicaria inuloides for the first time and the results show that this species can be considered as a source of anti-leishmanicidal agents. The bioguided fractionation of the active extract of CHCl3 from C. albidus against T. cruzi led to the isolation of two fractions F6,4 and F6,5 which showed also a potent activity up to 100 μg/ml. The bioguided fractionation of the active extract of AcOEt from the aerial part of C. albidus against A. castellanii led to the isolation of a fraction F14A which showed a significant activity up to 100 μg / ml. Fractions F6,4 ; F6,5 and F14A consists of product mixtures, which have not been separated.
We have also described the chemical compositions of the essential oils of Pulicaria inuloides and Cistus albidus. The major compounds of the species C. albidus are manool and 15,16-dinorlabd-8(20)- en-13-one whose skeleton of type labdane is a specific marker in this genus, these compounds are not described in samples from other regions and in particular in the Mediterranean regions (Spain and France) that appeared in the literature. The major compounds of the species Pulicaria inuloides are: δ- cadinene, α-muurolene, γ-cadinene, α-epi-cadinol and α-cadinol are not present in the other samples of Pulicaria inuloides from other areas published in the literature.
In this study, the mineral content (inorganic elements) of 21 isolated extracts of various aromatic species of the Sahara (P. inuloides) and the Aures region (Euphorbia helioscopia L., Peganum harmala L., Daphne gnidium L., Calendula algeriensis L., Bunium incrassatum L., Echinops ritro L. Marrubium deserti de Noè., Juniperus oxycedrus L., Juniperus phoenicea L., Marrubium vulgare L., Cedrus atlantica (Endl.) Manetti and Thymus algeriensis L.) were also determined by inductively coupled plasma atomic emission spectroscopy (ICP-AES) and inductively coupled plasma mass spectroscopy (ICP-MS) . The results obtained showed higher concentrations of Ca, K, Mg, Na and S
(mg/kg) in the different plant extracts.
Diplôme : Doctorat En ligne : ../theses/chimie/FAD7287.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10902 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité FAD/7287 FAD/7287 Thèse Bibliothèque principale Thèses Disponible
Titre : Impact de plantes riches en métabolites secondaires sur la méthanogénèse ruminale et les activités fermentaires du microbiome ruminal chez des ovins Type de document : texte imprimé Auteurs : Moufida Rira, Auteur ; H. Bousseboua, Directeur de thèse ; Michel Doreau, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2015 Importance : 201 f. Format : 30 cm. Note générale : 2 copies imprimes disponibles Langues : Français (fre) Catégories : Français - Anglais
BiologieTags : Méthane tanins condensés huiles essentielles fermentation microbiote ruminal moutons Methane condensed tannins essential oils rumen microbes sheepميثان طانينات زيوت عطرية تخمر ميكروبات الكرش مجترات Index. décimale : 570 Sciences de la vie. Biologie Résumé : Strategies of methane reduction will have to take into account the other environmental
impacts and the social-economic stakes. Therefore, the main encouraging way envisaged to
reduce enteric methane is the use of additives containing plants secondary metabolites.
The objective of this thesis work was to test at first the in vitro potential of essential
oil extracts and condensed tannins-rich plants to reduce methane production. Secondly, an in
vivo study was conducted for a validation of results obtained in vitro and for a better
knowledge of ruminal methanogenesis and fermentative phenomena.
Our work allows concluding that essential oil and condensed tannins have the potential
to decrease in vitro methane production. Essential oils of Mentha pulegium and Juniperus
phoenicea negatively affect in vitro ruminal fermentation. Condensed tannins reduce in vivo
methane production without notable unwanted effects on ruminal fermentation and on
digestibility. The effect of condensed tannins is rather linked to the dose and not to the nature
of the plant. This work also highlighted the absence of relation between concentration and
diversity of methanogens and methanogenesis. Reduction of methane is due to the inhibition
of the activity of methanogens rather than to the decrease of their concentration. The
presentation of tannins rich plants under granular shape had also accelerated the transit.
Results from the in vivo study suggests that dietary condensed tannins from Leucaena
leucocephala, Manihot esculenta, and to a lesser extent from Gliricidia sepium in pellet form
could be used to mitigate methane production with no marked detrimental effects on other
fermentative parameters.Diplôme : Doctorat en sciences En ligne : ../theses/biologie/RIR6839.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10114 Impact de plantes riches en métabolites secondaires sur la méthanogénèse ruminale et les activités fermentaires du microbiome ruminal chez des ovins [texte imprimé] / Moufida Rira, Auteur ; H. Bousseboua, Directeur de thèse ; Michel Doreau, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2015 . - 201 f. ; 30 cm.
2 copies imprimes disponibles
Langues : Français (fre)
Catégories : Français - Anglais
BiologieTags : Méthane tanins condensés huiles essentielles fermentation microbiote ruminal moutons Methane condensed tannins essential oils rumen microbes sheepميثان طانينات زيوت عطرية تخمر ميكروبات الكرش مجترات Index. décimale : 570 Sciences de la vie. Biologie Résumé : Strategies of methane reduction will have to take into account the other environmental
impacts and the social-economic stakes. Therefore, the main encouraging way envisaged to
reduce enteric methane is the use of additives containing plants secondary metabolites.
The objective of this thesis work was to test at first the in vitro potential of essential
oil extracts and condensed tannins-rich plants to reduce methane production. Secondly, an in
vivo study was conducted for a validation of results obtained in vitro and for a better
knowledge of ruminal methanogenesis and fermentative phenomena.
Our work allows concluding that essential oil and condensed tannins have the potential
to decrease in vitro methane production. Essential oils of Mentha pulegium and Juniperus
phoenicea negatively affect in vitro ruminal fermentation. Condensed tannins reduce in vivo
methane production without notable unwanted effects on ruminal fermentation and on
digestibility. The effect of condensed tannins is rather linked to the dose and not to the nature
of the plant. This work also highlighted the absence of relation between concentration and
diversity of methanogens and methanogenesis. Reduction of methane is due to the inhibition
of the activity of methanogens rather than to the decrease of their concentration. The
presentation of tannins rich plants under granular shape had also accelerated the transit.
Results from the in vivo study suggests that dietary condensed tannins from Leucaena
leucocephala, Manihot esculenta, and to a lesser extent from Gliricidia sepium in pellet form
could be used to mitigate methane production with no marked detrimental effects on other
fermentative parameters.Diplôme : Doctorat en sciences En ligne : ../theses/biologie/RIR6839.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10114 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité RIR/6839 RIR/6839 Thèse Bibliothèque principale Thèses Disponible
Titre : استخلاص وتنقية المركبات الفعالة بيولوجيا من بعض الأنواع النباتية : : Ormenis africana Chrysanthemum fuscatum , Chrysanthemum macrocarpum et Chrysanthemum reboudianumمع دراسة مقارنة لنشاطيتها ضد ميكروبية Type de document : texte imprimé Auteurs : كمال درويش, Auteur ; صالح غواطي, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2015 Importance : 214 ورقة. Format : 30 سم. Note générale : 2 نسخ موجودة في المكتبة المركزية Langues : Arabe (ara) Catégories : Arabe
5 البيولوجياTags : بيوتكنولوجيا ميكروبية العائلة النجمیة . Chrysanthemum spالفلافونویدات الزیوت الأساسیة النشاطیة
ضد میكروبیة النشاطیة ضد مؤكسدة
Asteraceae Chrysanthemum sp. Flavonoides Essential oils Antimicrobial acivity Antioxydant acivity Asteraceae, Chrysanthemum sp. Flavonoïdes Huilles essentielles Activité antimicrobienne Activité antioxydanteIndex. décimale : 570 بيولوجيا Résumé : The phytochemical screening of species: Ormenis africana, Chrysanthemum macrocarpum,
C.mreboudianum and C. fuscatum shows the presence of essential oils, flavonoids, sterols or terpenes,saponins and carotenoids.
The GC/MS analysis of the essential oils of species: Oa, Cƒ and Cr showed that these oils contain major compounds with oxygenic functions (aldehydes, ketones, esters and acids) and that for theathreeaplants.
This study also allowed the isolate, the purify and the identify of three compounds from the flowers of Oa (B-sitosterol, Luteolin-7-O-glucoside and Quercetin-3-O-glucoside), the molecular structures of purified compounds were elucidated by UV spectroscopy techniques and NMR (1H, 13C).
Spectrometric quantitative determinations of total polyphenols by Folin-Ciocalteu reagent and flavonoids those prepared by the aluminum chloride AlCl3 revealed rich extracts (AcOEt and BuOH) by flavonoids and phenols contribution extracts (Hexane and CHCl3) of different species tested.
The antiradical potential of essential oils (Oa, Cƒ and Cr) and extracts (Hexane, CHCl3, EtOAc and BuOH) Oa and chrysanthemum species tested was determined by the method of DPPH and the results show that essential oil of Oa is most active by supplying essential oils (Cƒ and Cr). The extract butanol and ethyl acetate of the two species (Oa and Cm) in addition to the chloroform extract of the species Cƒ, demonstrated a remarkable antioxidant activity.
The antimicrobial potency testing, CMI and CMD has been made on a range of (bacteria and fungi) to give an idea of the scope of our antimicrobial activity (essential oils and flavonoid extracts), the EO of Oa seems to enjoy a remarkable inhibitory activity against Gram (+) tested and Candida albicans compared with the EO of Cƒ and EO of Cr appears less active. The results also show a sensitivity of Staphylococcus aureus and Pseudomonas aeruginosa resistant to the essential oils and various extracts tested.Diplôme : Doctorat en sciences En ligne : ../theses/biologie/ADER4102.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10138 استخلاص وتنقية المركبات الفعالة بيولوجيا من بعض الأنواع النباتية : : Ormenis africana Chrysanthemum fuscatum , Chrysanthemum macrocarpum et Chrysanthemum reboudianumمع دراسة مقارنة لنشاطيتها ضد ميكروبية [texte imprimé] / كمال درويش, Auteur ; صالح غواطي, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2015 . - 214 ورقة. ; 30 سم.
2 نسخ موجودة في المكتبة المركزية
Langues : Arabe (ara)
Catégories : Arabe
5 البيولوجياTags : بيوتكنولوجيا ميكروبية العائلة النجمیة . Chrysanthemum spالفلافونویدات الزیوت الأساسیة النشاطیة
ضد میكروبیة النشاطیة ضد مؤكسدة
Asteraceae Chrysanthemum sp. Flavonoides Essential oils Antimicrobial acivity Antioxydant acivity Asteraceae, Chrysanthemum sp. Flavonoïdes Huilles essentielles Activité antimicrobienne Activité antioxydanteIndex. décimale : 570 بيولوجيا Résumé : The phytochemical screening of species: Ormenis africana, Chrysanthemum macrocarpum,
C.mreboudianum and C. fuscatum shows the presence of essential oils, flavonoids, sterols or terpenes,saponins and carotenoids.
The GC/MS analysis of the essential oils of species: Oa, Cƒ and Cr showed that these oils contain major compounds with oxygenic functions (aldehydes, ketones, esters and acids) and that for theathreeaplants.
This study also allowed the isolate, the purify and the identify of three compounds from the flowers of Oa (B-sitosterol, Luteolin-7-O-glucoside and Quercetin-3-O-glucoside), the molecular structures of purified compounds were elucidated by UV spectroscopy techniques and NMR (1H, 13C).
Spectrometric quantitative determinations of total polyphenols by Folin-Ciocalteu reagent and flavonoids those prepared by the aluminum chloride AlCl3 revealed rich extracts (AcOEt and BuOH) by flavonoids and phenols contribution extracts (Hexane and CHCl3) of different species tested.
The antiradical potential of essential oils (Oa, Cƒ and Cr) and extracts (Hexane, CHCl3, EtOAc and BuOH) Oa and chrysanthemum species tested was determined by the method of DPPH and the results show that essential oil of Oa is most active by supplying essential oils (Cƒ and Cr). The extract butanol and ethyl acetate of the two species (Oa and Cm) in addition to the chloroform extract of the species Cƒ, demonstrated a remarkable antioxidant activity.
The antimicrobial potency testing, CMI and CMD has been made on a range of (bacteria and fungi) to give an idea of the scope of our antimicrobial activity (essential oils and flavonoid extracts), the EO of Oa seems to enjoy a remarkable inhibitory activity against Gram (+) tested and Candida albicans compared with the EO of Cƒ and EO of Cr appears less active. The results also show a sensitivity of Staphylococcus aureus and Pseudomonas aeruginosa resistant to the essential oils and various extracts tested.Diplôme : Doctorat en sciences En ligne : ../theses/biologie/ADER4102.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10138 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité درو/4102 درو/4102 Thèse Bibliothèque principale Thèses Disponible
PermalinkPermalink
Permalink
