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Partager le résultat de cette recherche Interroger des sources externesEffet antioxydant de l’huile essentielle de la plante Guezzah (Pituranthos chloranthus) incorporée dans des shortenings produits au niveau de CEVITAL SPA. / Rima Sabouni
Titre : Effet antioxydant de l’huile essentielle de la plante Guezzah (Pituranthos chloranthus) incorporée dans des shortenings produits au niveau de CEVITAL SPA. Type de document : texte imprimé Auteurs : Rima Sabouni, Auteur ; H. Namoune, Directeur de thèse Editeur : constantine [Algérie] : Université Constantine 1 Année de publication : 2014 Importance : 74 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
Nutrition, Alimentation et Technologies Agro-AlimentairesTags : Pituranthos chloranthus shortening oxydation antioxydants huile essentielle Essential oil الأكسدة مضادات الأكسدة الزيت الأساسي Index. décimale : 640 Industrie Alimentaire Résumé : Through the present study on the assessment of the antioxidant activity of Pituranthos chloranthus’ essential oil, endemic plant of the Algerian Sahara high plateau and its incorporation in a shortening formulation produced in at a laboratory scale in a margarinery of CEVITAL Food Company, it is revealed that:
Aerial part of Pituranthos chloranthus showed a moisture of (11,8 ± 0,097) % and an essential oil’s extraction yield, extracted by hydrodistillation, is near (0,86 ± 0,09) % and an optimization of time (t = 250min) for a dry plant mass of de (m = 80 g).
Antioxidant activity of the present plant material, determined by three tests: reducing power,DPPH and
-carotene bleaching test against a standard (α-Tocopherol or Vitamine E). The reducing power is of (0.094 ± 0.018) g TE/g EO, IC50 of (0,024 ± 0,002) mg/ml and a protective effect against
-carotene oxidation.
Physico-chemical characteristics of the shortening produced including: acidity, peroxide index and melting point are in a good agreement with the internal company standards.
Assessment of oxidative stability is carried out by Rancimat and Schaal tests. Rancimat showed that shortening incorporated with 75ppm gave the best resistance to oxidation. This is also consistent with Shaal test, with a peroxide index of PI = 0, 28 meq g O2/1000g, carried out in 35 days.
Thus, Pituranthos chloranthus essential oil may be of a technological interest to serve like preservatives in fats and oils, especially in food companies.
Diplôme : Magistère En ligne : ../theses/agronomie/SAB6692.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=9931 Effet antioxydant de l’huile essentielle de la plante Guezzah (Pituranthos chloranthus) incorporée dans des shortenings produits au niveau de CEVITAL SPA. [texte imprimé] / Rima Sabouni, Auteur ; H. Namoune, Directeur de thèse . - constantine [Algérie] : Université Constantine 1, 2014 . - 74 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
Nutrition, Alimentation et Technologies Agro-AlimentairesTags : Pituranthos chloranthus shortening oxydation antioxydants huile essentielle Essential oil الأكسدة مضادات الأكسدة الزيت الأساسي Index. décimale : 640 Industrie Alimentaire Résumé : Through the present study on the assessment of the antioxidant activity of Pituranthos chloranthus’ essential oil, endemic plant of the Algerian Sahara high plateau and its incorporation in a shortening formulation produced in at a laboratory scale in a margarinery of CEVITAL Food Company, it is revealed that:
Aerial part of Pituranthos chloranthus showed a moisture of (11,8 ± 0,097) % and an essential oil’s extraction yield, extracted by hydrodistillation, is near (0,86 ± 0,09) % and an optimization of time (t = 250min) for a dry plant mass of de (m = 80 g).
Antioxidant activity of the present plant material, determined by three tests: reducing power,DPPH and
-carotene bleaching test against a standard (α-Tocopherol or Vitamine E). The reducing power is of (0.094 ± 0.018) g TE/g EO, IC50 of (0,024 ± 0,002) mg/ml and a protective effect against
-carotene oxidation.
Physico-chemical characteristics of the shortening produced including: acidity, peroxide index and melting point are in a good agreement with the internal company standards.
Assessment of oxidative stability is carried out by Rancimat and Schaal tests. Rancimat showed that shortening incorporated with 75ppm gave the best resistance to oxidation. This is also consistent with Shaal test, with a peroxide index of PI = 0, 28 meq g O2/1000g, carried out in 35 days.
Thus, Pituranthos chloranthus essential oil may be of a technological interest to serve like preservatives in fats and oils, especially in food companies.
Diplôme : Magistère En ligne : ../theses/agronomie/SAB6692.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=9931 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité SAB/6692 SAB/6692 Thèse Bibliothèque principale Thèses Disponible
Titre : Etude chimique et biologique des espèces Calligonum azel et Calligonum comosum (Polygonaceae) et une espèce du genre Thymus (Lamiaceae). Type de document : texte imprimé Auteurs : Soumia Belaabed Khalfaoui, Auteur ; Nour-eddine Beghidja, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2018 Importance : 250 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
ChimieTags : Calligonum azel Calligonum comosum Thymus ciliatus Polygonaceae Lamiaceae RMN 1D et 2D CLHP HRESIMS activités biologiques huile essentielle NMR 1D and 2D HPLC Biological activities essential oil مطيافية الرنين المغناطيسي1D و2D كروماتوغرافيا HPLC مطيافية الكتلة النضاطات البيولوجية الزيوت الأساسية Index. décimale : 540 Chimie et sciences connexes Résumé : The phytochemical and biological study concerns the aerial parts of two endemic Saharian species belonging to the polygonaceae family: Calligonum azel and Calligonum comosum and a third one belonging to the Lamiaceae family.
The object of our work focused on the valorization of the Algerian flora. For this, firstly; we carried out a phytochemical study on Calligonum azel and Calligonum comosum which concerned mainly the biologically active compounds then we tested the antioxidant, antibacterial, antifungal and anti-inflammatory properties of all the organic extracts and some isolated compounds. Secondly; we studied the chemical composition and biological activities of Thymus ciliatus essential oil.
The study of aerial parts of C. azel and C. comosum, in order to know the active compounds responsible for their biological activity, leading to purification, chromatographic identification (CC, TLC and HPLC), and characterization using the different spectroscopic methods (1D and 2D NMR, MS and UV) of twenty one pure compounds (21) in which eighteen (18) compounds were identified.
The investigation of the biological activities of the extracts of Calligonum azel and Calligonum comosum showed that the best antioxidant activity was exhibited by the Chloroform and ethyl acetate extracts of C. azel and the Chloroform extract of C. comosum. The chloroform extracts of both species showed the best antibacterial activity. Chloroform extract from C. comosum has better antifungal activity against Candida albicans ATCC 2019 and Candida parapsilosis ATCC 22019.
From the isolated compounds, three have an antioxidant and anti-inflammatory activity. These compounds were: protocatachuic ethyl ester acid, -diamino (4-hydroxy benzene) butanoic acid and tamgernanetin.
The qualitative and quantitative analysis of essential oil of T. ciliatus allows the identification of 25 compounds representing 87.18 % of the total essential oil mainly. The GC and GC-MS analysis showed that this essential oils was mainly rich of thymol (54.26%), carvacrol methyl ether (1,373 %), o-cymene (5.72 %) carvacrol (1.373%)-cymen-7-ol (17.58 %), however it was the first time that -cymen-7-ol (17.58 %) was found as main component in the essential oils of T. ciliatus.
The evaluation of the antibacterial activity was assessed by disc diffusion method against bacterial strains. The essential oil exhibited a good antibacterial activity against Escherichia coli ATCC 25922, Staphylococcus aureus ATCC 43300 and Staphylocossus aureus.
All of our works confirms the medicinal properties of the Saharian species, and contributes to their scientific descriptions.Diplôme : Doctorat En ligne : ../theses/chimie/BEL7311.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10926 Etude chimique et biologique des espèces Calligonum azel et Calligonum comosum (Polygonaceae) et une espèce du genre Thymus (Lamiaceae). [texte imprimé] / Soumia Belaabed Khalfaoui, Auteur ; Nour-eddine Beghidja, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2018 . - 250 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
ChimieTags : Calligonum azel Calligonum comosum Thymus ciliatus Polygonaceae Lamiaceae RMN 1D et 2D CLHP HRESIMS activités biologiques huile essentielle NMR 1D and 2D HPLC Biological activities essential oil مطيافية الرنين المغناطيسي1D و2D كروماتوغرافيا HPLC مطيافية الكتلة النضاطات البيولوجية الزيوت الأساسية Index. décimale : 540 Chimie et sciences connexes Résumé : The phytochemical and biological study concerns the aerial parts of two endemic Saharian species belonging to the polygonaceae family: Calligonum azel and Calligonum comosum and a third one belonging to the Lamiaceae family.
The object of our work focused on the valorization of the Algerian flora. For this, firstly; we carried out a phytochemical study on Calligonum azel and Calligonum comosum which concerned mainly the biologically active compounds then we tested the antioxidant, antibacterial, antifungal and anti-inflammatory properties of all the organic extracts and some isolated compounds. Secondly; we studied the chemical composition and biological activities of Thymus ciliatus essential oil.
The study of aerial parts of C. azel and C. comosum, in order to know the active compounds responsible for their biological activity, leading to purification, chromatographic identification (CC, TLC and HPLC), and characterization using the different spectroscopic methods (1D and 2D NMR, MS and UV) of twenty one pure compounds (21) in which eighteen (18) compounds were identified.
The investigation of the biological activities of the extracts of Calligonum azel and Calligonum comosum showed that the best antioxidant activity was exhibited by the Chloroform and ethyl acetate extracts of C. azel and the Chloroform extract of C. comosum. The chloroform extracts of both species showed the best antibacterial activity. Chloroform extract from C. comosum has better antifungal activity against Candida albicans ATCC 2019 and Candida parapsilosis ATCC 22019.
From the isolated compounds, three have an antioxidant and anti-inflammatory activity. These compounds were: protocatachuic ethyl ester acid, -diamino (4-hydroxy benzene) butanoic acid and tamgernanetin.
The qualitative and quantitative analysis of essential oil of T. ciliatus allows the identification of 25 compounds representing 87.18 % of the total essential oil mainly. The GC and GC-MS analysis showed that this essential oils was mainly rich of thymol (54.26%), carvacrol methyl ether (1,373 %), o-cymene (5.72 %) carvacrol (1.373%)-cymen-7-ol (17.58 %), however it was the first time that -cymen-7-ol (17.58 %) was found as main component in the essential oils of T. ciliatus.
The evaluation of the antibacterial activity was assessed by disc diffusion method against bacterial strains. The essential oil exhibited a good antibacterial activity against Escherichia coli ATCC 25922, Staphylococcus aureus ATCC 43300 and Staphylocossus aureus.
All of our works confirms the medicinal properties of the Saharian species, and contributes to their scientific descriptions.Diplôme : Doctorat En ligne : ../theses/chimie/BEL7311.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10926 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BEL/7311 BEL/7311 Thèse Bibliothèque principale Thèses Disponible
Titre : Etude chimique et biologique de plantes médicinales Algériennes : cas des Espèces Zizyphus lotus et Fagonia longispina. Type de document : texte imprimé Auteurs : Widad Ourzeddine, Auteur ; Samir Benayache, Directeur de thèse ; Fadila Benayache, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2018 Importance : 232 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
ChimieTags : Fagonia longispina Zizyphus lotus huiles essentielles séparations chromatographiques méthodes spectroscopiques analyse GC-FID et GC-MS activité antioxydante activité antibactérienne essential oil different chromatographic
methods GC-FID and GC-MS analysis spectrophotometers methods antioxidant activity الفصل الكروماتوغرافي طرق التحليل الطيفي الزيوت الأساسية التحليل GC-FIDوGC-MS- النشاط المضاد للأكسدة النشاط المضاد للبكتيرياIndex. décimale : 540 Chimie et sciences connexes Résumé : The present work is devoted to the phytochemical and biological study of an endemic species of the septentrional Sahara Fagonia longispina Batt. (Zygophyllaceae) and the chemical composition and antioxidant activity study of fruit essential oil of Zizyphus lotus (L.) Desf. (Rhamnaceae).
In a first part, the phytochemical investigation of the species F. longispina using different chromatographic methods (CC, TLC and HPLC) led to isolation and identification by different spectroscopic methods (1D and 2D, MS and UV) 18 compounds. Among these isolated compounds, a new monoterpene ∆-2-carene-6-ol-6-O-(2',6'-diacetyl)-β-D-glucopyranoside, together with four other monoterpenes, seven flavonoids, four phenolic derivatives and two
sterol.
Moreover, the in vitro free radical-scavenging activity of the all extracts has been investigated by DPPH test, which have demonstrated that ethyl acetate extract are good sources of antioxidant compounds. However, all extracts of F. longispina showed no substantial result compared to the antioxidant activity of ascorbic acid. In addition, the total phenolic and the flavonoids contents were measured using spectrophotometers methods, the results showed that the acetate extract has a high content compared to the other extracts. As for antibacterial activity study, showed that a high antibacterial effect of the ethyl acetate extract.
In a second part, the chemical composition of fruit essential oil Z. lotus has been investigated by the GC-FID and GC-MS analysis, which led to identified 38 compounds. Fatty acids represented the major fraction (saturated and unsaturated compounds 67.8 and 11%, respectively), followed by hydrocarbons (10.8%) and sesquiterpenes (1.1%).These results were quite different from those obtained previously on the fixed oil of the fruit of this species from two samples from Algeria.
The antioxidant property of this oil was evaluated using β-carotene bleaching method. The result indicated the potent antioxidant activity of essential oils from Z. lotus.Diplôme : Doctorat En ligne : ../theses/chimie/OUR7236.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10831 Etude chimique et biologique de plantes médicinales Algériennes : cas des Espèces Zizyphus lotus et Fagonia longispina. [texte imprimé] / Widad Ourzeddine, Auteur ; Samir Benayache, Directeur de thèse ; Fadila Benayache, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2018 . - 232 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
ChimieTags : Fagonia longispina Zizyphus lotus huiles essentielles séparations chromatographiques méthodes spectroscopiques analyse GC-FID et GC-MS activité antioxydante activité antibactérienne essential oil different chromatographic
methods GC-FID and GC-MS analysis spectrophotometers methods antioxidant activity الفصل الكروماتوغرافي طرق التحليل الطيفي الزيوت الأساسية التحليل GC-FIDوGC-MS- النشاط المضاد للأكسدة النشاط المضاد للبكتيرياIndex. décimale : 540 Chimie et sciences connexes Résumé : The present work is devoted to the phytochemical and biological study of an endemic species of the septentrional Sahara Fagonia longispina Batt. (Zygophyllaceae) and the chemical composition and antioxidant activity study of fruit essential oil of Zizyphus lotus (L.) Desf. (Rhamnaceae).
In a first part, the phytochemical investigation of the species F. longispina using different chromatographic methods (CC, TLC and HPLC) led to isolation and identification by different spectroscopic methods (1D and 2D, MS and UV) 18 compounds. Among these isolated compounds, a new monoterpene ∆-2-carene-6-ol-6-O-(2',6'-diacetyl)-β-D-glucopyranoside, together with four other monoterpenes, seven flavonoids, four phenolic derivatives and two
sterol.
Moreover, the in vitro free radical-scavenging activity of the all extracts has been investigated by DPPH test, which have demonstrated that ethyl acetate extract are good sources of antioxidant compounds. However, all extracts of F. longispina showed no substantial result compared to the antioxidant activity of ascorbic acid. In addition, the total phenolic and the flavonoids contents were measured using spectrophotometers methods, the results showed that the acetate extract has a high content compared to the other extracts. As for antibacterial activity study, showed that a high antibacterial effect of the ethyl acetate extract.
In a second part, the chemical composition of fruit essential oil Z. lotus has been investigated by the GC-FID and GC-MS analysis, which led to identified 38 compounds. Fatty acids represented the major fraction (saturated and unsaturated compounds 67.8 and 11%, respectively), followed by hydrocarbons (10.8%) and sesquiterpenes (1.1%).These results were quite different from those obtained previously on the fixed oil of the fruit of this species from two samples from Algeria.
The antioxidant property of this oil was evaluated using β-carotene bleaching method. The result indicated the potent antioxidant activity of essential oils from Z. lotus.Diplôme : Doctorat En ligne : ../theses/chimie/OUR7236.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10831 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité OUR/7236 OUR/7236 Thèse Bibliothèque principale Thèses Disponible
Titre : Etude écophysiologique, développement et importance des plantes médicinales du genre Mentha dans le Parc National d’El-Kala (Nord-Est Algérie). Type de document : texte imprimé Auteurs : Amina Benabdallah, Auteur ; Chaabane Rahmoune, Directeur de thèse Importance : 152 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
BiologieTags : M. aquatica M. arvensis Mx piperita M.pulegium M. rotundifolia M. x villosa NPEK ElKala RAMSAR phenols flavonoids tannins essential oil antioxidant acetylcholinesterase PNEK phénols, flavonoïdes, huile essentielle antioxydant acétylcholinestérase Index. décimale : 570 Sciences de la vie. Biologie Résumé : Mentha species are widely used by native habitants of El-Tarf region, as condiment, flavor or
herb in culinary preparations but also used for therapeutic properties as carminative, sedative,
antispasmodic and well known to treat stomach pain.
The aim of this work was first to inventory and geolocalisate Mentha species of the National
Park of El-Kala and then to investigate the total phenolics, flavonoids and tannins content and
the in-vitro antioxidant activities of methanolic extracts and essential oils, then to evaluate the
chemical composition of essential oils obtained from aerial parts of six wildMentha species:
M. aquatica, M. arvensis, M x piperita, M. pulegium, M. rotundifolia and M x villosa.
Chemical composition was analyzed by GC-MS method and biological activities investigated
by DPPH, B-carotene bleaching and ion chelating assays for the antioxidant activity, as well
as the inhibition of acetycholinesterase. The methanol extracts of mints were rich in phenolic
compounds and exhibited a powerful antioxidant activity ranged from7.5µg/mlto44.66
µg/ml,which varied significantly among species. M. aquatica stands out with an efficient
antioxidant ability which is correlated to the high total phenolics contents, followed by M.
arvensis and M. piperita with very close values, comparing to M. pulegium, M. rotundifolia
and M. villosa with lowest values. Qualitative and quantitative variations were observed
among species. The highest yield of oils, obtained by hydrodistillation, was recorded for M.
pulegium with 1.8%. A total of 27 compounds were identified with the predominance of
oxygenated monoterpenes such as menthofurane (73.38%), rotundifolone (65.99%), pulegone
(59.12%), menthol (49.89%), menthone (20.84%), neomenthol (20.76%), 1.8-cineol (18.16%)
and β-caryophyllene (12.55%). In general, M. aquatica exhibited the strongest antioxidant
level with IC50 of 0.69±0.06 mg/ml assessed by DPPH assay, 0.16±0.02 mg/ml by β-Carotene
bleaching and 1.73±0.17 mg/ml by ferrous ion chelating method. Whereas M. arvensisstood
out with IC50 of 27.5mg/ml for acetylcholinesterase inhibitory.These results show that Mentha
species from NPEK have a great potential of polyphenols which can be used as a natural food
preservative and antioxidant source. Moreover, mints could be exploited for their
pharmacological application in order to prevent induced diseases relied to oxidative stress.Diplôme : Doctorat en sciences En ligne : ../theses/biologie/BEN7087.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10514 Etude écophysiologique, développement et importance des plantes médicinales du genre Mentha dans le Parc National d’El-Kala (Nord-Est Algérie). [texte imprimé] / Amina Benabdallah, Auteur ; Chaabane Rahmoune, Directeur de thèse . - [s.d.] . - 152 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
BiologieTags : M. aquatica M. arvensis Mx piperita M.pulegium M. rotundifolia M. x villosa NPEK ElKala RAMSAR phenols flavonoids tannins essential oil antioxidant acetylcholinesterase PNEK phénols, flavonoïdes, huile essentielle antioxydant acétylcholinestérase Index. décimale : 570 Sciences de la vie. Biologie Résumé : Mentha species are widely used by native habitants of El-Tarf region, as condiment, flavor or
herb in culinary preparations but also used for therapeutic properties as carminative, sedative,
antispasmodic and well known to treat stomach pain.
The aim of this work was first to inventory and geolocalisate Mentha species of the National
Park of El-Kala and then to investigate the total phenolics, flavonoids and tannins content and
the in-vitro antioxidant activities of methanolic extracts and essential oils, then to evaluate the
chemical composition of essential oils obtained from aerial parts of six wildMentha species:
M. aquatica, M. arvensis, M x piperita, M. pulegium, M. rotundifolia and M x villosa.
Chemical composition was analyzed by GC-MS method and biological activities investigated
by DPPH, B-carotene bleaching and ion chelating assays for the antioxidant activity, as well
as the inhibition of acetycholinesterase. The methanol extracts of mints were rich in phenolic
compounds and exhibited a powerful antioxidant activity ranged from7.5µg/mlto44.66
µg/ml,which varied significantly among species. M. aquatica stands out with an efficient
antioxidant ability which is correlated to the high total phenolics contents, followed by M.
arvensis and M. piperita with very close values, comparing to M. pulegium, M. rotundifolia
and M. villosa with lowest values. Qualitative and quantitative variations were observed
among species. The highest yield of oils, obtained by hydrodistillation, was recorded for M.
pulegium with 1.8%. A total of 27 compounds were identified with the predominance of
oxygenated monoterpenes such as menthofurane (73.38%), rotundifolone (65.99%), pulegone
(59.12%), menthol (49.89%), menthone (20.84%), neomenthol (20.76%), 1.8-cineol (18.16%)
and β-caryophyllene (12.55%). In general, M. aquatica exhibited the strongest antioxidant
level with IC50 of 0.69±0.06 mg/ml assessed by DPPH assay, 0.16±0.02 mg/ml by β-Carotene
bleaching and 1.73±0.17 mg/ml by ferrous ion chelating method. Whereas M. arvensisstood
out with IC50 of 27.5mg/ml for acetylcholinesterase inhibitory.These results show that Mentha
species from NPEK have a great potential of polyphenols which can be used as a natural food
preservative and antioxidant source. Moreover, mints could be exploited for their
pharmacological application in order to prevent induced diseases relied to oxidative stress.Diplôme : Doctorat en sciences En ligne : ../theses/biologie/BEN7087.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10514 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BEN/7087 BEN/7087 Thèse Bibliothèque principale Thèses Disponible
Titre : Évaluation des activités biologiques des huiles essentielles du citron (Citrus limon) : encapsulation et application comme agent conservateur à la margarine allégée. Type de document : texte imprimé Auteurs : Louiza Himed, Auteur ; Malika Barkat, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2018 Importance : 142 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
Nutrition, Alimentation et Technologies Agro-AlimentairesTags : Huile essentielle Citrus limon Hydrodistillation Pression à froid Pouvoir antioxydant Pouvoir antimicrobien Encapsulation Margarine allégée Essential oil Cold pressure Antioxidant power Antimicrobial power Lightened margarine زيت أساسي ضغط بارد مضادة للأكسدة قوة مضادة للميكروبات تغليف المارغرين الخفيف Index. décimale : 640 Industrie Alimentaire Résumé : The main objective of this work is to test the encapsulated essential oils in order to solve the problem of their instability, and apply them in light margarine in order to follow its oxidative stability and to evaluate its acceptability. The essential oils were extracted by hydrodistillation and cold pressing from two varieties of
Citrus limon: Eureka and Lisbon. Recovered oils were analyzed by GC/MS to identify their constituents. As main results obtained, the extraction yield was greater by hydrodistillation than by cold pressure. The composition of the oils extracted was different but it was characterized by a dominance of monoterpenes, followed by oxygenated monoterpenes and then sesquiterpenes and finally oxygenated sesquiterpenes. High levels of limonene were
recorded (61% - 67%). The antioxidant activity of the extracted oils was evaluated by several tests, namely the test for the inhibition of lipid peroxidation (β-carotene bleaching and the β-carotene qualitative test), the free radical scavenging test (DPPH and ABTS+), the test of the reducing power (CUPRAC and FRAP) and finally the test of the chelating power. The results obtained showed an interesting antioxidant power of Eureka oils extracted by cold pressure compared to other oils. On the other hand, the chelating power was less important for all oils compared with EDTA. The antimicrobial power of the oils was evaluated by two tests to determine the susceptibility of the strains and the microbiological parameters CMI, CMB and CMF. The strains tested are of 15, including 9 bacterial strains (2 Gram positive and 7 Gram negative) and 6 fungal strains. The results showed that all strains are sensitive and the oils have interesting antimicrobial properties. The essential oils of the Eureka variety extracted by cold pressing, having the best antioxidant power, were encapsulated in amorphous silica and then characterized by SEM, ATR and TGA and an evaluation of ther antioxidant power. The results showed a significant encapsulation efficiency of 95.87%. No interaction between oils and SiO2 has been reported. On the other hand, a thermogravimetric resistant of the encapsulated oils was noticed compared to the free oils. The antioxidant activity of essential oils was not changed after encapsulation. Three formulas of light margarine were developed: control margarine (CM), free essential oil margarine (FOM) and encapsulated oils margarine (EOM). A physico-chemical characterization, a determination of the resistance to forced oxidation and sensory analysis
were carried out. The results showed that the physico-chemical characteristics of margarines with essential oils are in accordance with the standards and the pre-established recipe and are not different from those of the control. The EOM showed resistance to forced oxidation comparable to that of the control (CM), however the resistance of the FOM is not interesting. The tasters of the three formulas showed a preference of the FOM, then of the EOM and finally of the CM. Therefore it would be interesting to proceed with the industrial formulation
of a lemon essential oil margarine.
Diplôme : Doctorat en sciences En ligne : ../theses/agronomie/HIM7332.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10982 Évaluation des activités biologiques des huiles essentielles du citron (Citrus limon) : encapsulation et application comme agent conservateur à la margarine allégée. [texte imprimé] / Louiza Himed, Auteur ; Malika Barkat, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2018 . - 142 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
Nutrition, Alimentation et Technologies Agro-AlimentairesTags : Huile essentielle Citrus limon Hydrodistillation Pression à froid Pouvoir antioxydant Pouvoir antimicrobien Encapsulation Margarine allégée Essential oil Cold pressure Antioxidant power Antimicrobial power Lightened margarine زيت أساسي ضغط بارد مضادة للأكسدة قوة مضادة للميكروبات تغليف المارغرين الخفيف Index. décimale : 640 Industrie Alimentaire Résumé : The main objective of this work is to test the encapsulated essential oils in order to solve the problem of their instability, and apply them in light margarine in order to follow its oxidative stability and to evaluate its acceptability. The essential oils were extracted by hydrodistillation and cold pressing from two varieties of
Citrus limon: Eureka and Lisbon. Recovered oils were analyzed by GC/MS to identify their constituents. As main results obtained, the extraction yield was greater by hydrodistillation than by cold pressure. The composition of the oils extracted was different but it was characterized by a dominance of monoterpenes, followed by oxygenated monoterpenes and then sesquiterpenes and finally oxygenated sesquiterpenes. High levels of limonene were
recorded (61% - 67%). The antioxidant activity of the extracted oils was evaluated by several tests, namely the test for the inhibition of lipid peroxidation (β-carotene bleaching and the β-carotene qualitative test), the free radical scavenging test (DPPH and ABTS+), the test of the reducing power (CUPRAC and FRAP) and finally the test of the chelating power. The results obtained showed an interesting antioxidant power of Eureka oils extracted by cold pressure compared to other oils. On the other hand, the chelating power was less important for all oils compared with EDTA. The antimicrobial power of the oils was evaluated by two tests to determine the susceptibility of the strains and the microbiological parameters CMI, CMB and CMF. The strains tested are of 15, including 9 bacterial strains (2 Gram positive and 7 Gram negative) and 6 fungal strains. The results showed that all strains are sensitive and the oils have interesting antimicrobial properties. The essential oils of the Eureka variety extracted by cold pressing, having the best antioxidant power, were encapsulated in amorphous silica and then characterized by SEM, ATR and TGA and an evaluation of ther antioxidant power. The results showed a significant encapsulation efficiency of 95.87%. No interaction between oils and SiO2 has been reported. On the other hand, a thermogravimetric resistant of the encapsulated oils was noticed compared to the free oils. The antioxidant activity of essential oils was not changed after encapsulation. Three formulas of light margarine were developed: control margarine (CM), free essential oil margarine (FOM) and encapsulated oils margarine (EOM). A physico-chemical characterization, a determination of the resistance to forced oxidation and sensory analysis
were carried out. The results showed that the physico-chemical characteristics of margarines with essential oils are in accordance with the standards and the pre-established recipe and are not different from those of the control. The EOM showed resistance to forced oxidation comparable to that of the control (CM), however the resistance of the FOM is not interesting. The tasters of the three formulas showed a preference of the FOM, then of the EOM and finally of the CM. Therefore it would be interesting to proceed with the industrial formulation
of a lemon essential oil margarine.
Diplôme : Doctorat en sciences En ligne : ../theses/agronomie/HIM7332.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10982 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité HIM/7332 HIM/7332 Thèse Bibliothèque principale Thèses Disponible
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