L'idée principale de cette étude est d'évaluer différents chalcones comme antioxydants pour le biodiesel de tournesol. La transestérification de l'huile de tournesol a été réalisée par catalyse basique assistée par ultrasons, une conversion de 98,5 % a été obtenue. Les paramètres physicochimiques (viscosité, acide, iode et saponification) ont été évalués pour déterminer la qualité du biodiesel. Le profil d'acides gras a été déterminé par chromatographie en phase gazeuse avec détection d'ionisation de flamme (GC-FID). Onze chalcones ayant différents substituants ont été synthétisés, caractérisés par l'infrarouge transformée de Fourier (FT-IR) et la chromatographie en phase gazeuse couplée à la spectrométrie de masse (GC-MS), et leurs purités ont été déterminées par GC-MS et point de fusion. L'évaluation de l'activité antioxydante de ces chalcones a été réalisée en utilisant les méthodes de DPPH et de chimiluminescence, les chalcones qui ont montré l'activité antioxydante la plus élevée dans les tests in vitro ont été ajoutés au biodiesel, dont la stabilité oxydative a été mesurée dans Rancimat
Les informations fournies dans la section « Synopsis » peuvent faire référence à une autre édition de ce titre.
Vendeur : BuchWeltWeit Ludwig Meier e.K., Bergisch Gladbach, Allemagne
Taschenbuch. Etat : Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -The main idea of this study is to evaluate different chalcones as antioxidant for sunflower biodiesel. Sunflower oil transesterification was carried out by ultrasound-assisted basic catalysis, 98.5 % conversion was obtained. Physicochemical parameters (viscosity, acid, iodine and saponification values) were evaluated to determine the biodiesel quality. The fatty acid profile was determined by gas chromatography with flame ionization detection (GC-FID). Eleven chalcones having different substituents were synthesized, characterized by Fourier transform infrared (FT-IR) and gas chromatography coupled to mass spectrometry (GC-MS), and their purities were determined by GC-MS and melting point. The evaluation of the antioxidant activity of these chalcones was performed using the methods of DPPH and chemiluminescence, the chalcones that showed the highest antioxidant activity in in vitro tests were added to biodiesel, wich had its oxidative stability measured in Rancimat 56 pp. Englisch. N° de réf. du vendeur 9783659752322
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Vendeur : AHA-BUCH GmbH, Einbeck, Allemagne
Taschenbuch. Etat : Neu. nach der Bestellung gedruckt Neuware - Printed after ordering - The main idea of this study is to evaluate different chalcones as antioxidant for sunflower biodiesel. Sunflower oil transesterification was carried out by ultrasound-assisted basic catalysis, 98.5 % conversion was obtained. Physicochemical parameters (viscosity, acid, iodine and saponification values) were evaluated to determine the biodiesel quality. The fatty acid profile was determined by gas chromatography with flame ionization detection (GC-FID). Eleven chalcones having different substituents were synthesized, characterized by Fourier transform infrared (FT-IR) and gas chromatography coupled to mass spectrometry (GC-MS), and their purities were determined by GC-MS and melting point. The evaluation of the antioxidant activity of these chalcones was performed using the methods of DPPH and chemiluminescence, the chalcones that showed the highest antioxidant activity in in vitro tests were added to biodiesel, wich had its oxidative stability measured in Rancimat. N° de réf. du vendeur 9783659752322
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Vendeur : moluna, Greven, Allemagne
Etat : New. Dieser Artikel ist ein Print on Demand Artikel und wird nach Ihrer Bestellung fuer Sie gedruckt. Autor/Autorin: Rockembach CarolineCaroline Tuchtenhagen Rockembach a master s degree at the Graduate Program in Biochemistry and Bioprospecting - UFPel (2015), Bachelor s Degree in Chemistry from the Federal University of Pelotas (2012), Chemical t. N° de réf. du vendeur 158429124
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Vendeur : buchversandmimpf2000, Emtmannsberg, BAYE, Allemagne
Taschenbuch. Etat : Neu. This item is printed on demand - Print on Demand Titel. Neuware -The main idea of this study is to evaluate different chalcones as antioxidant for sunflower biodiesel. Sunflower oil transesterification was carried out by ultrasound-assisted basic catalysis, 98.5 % conversion was obtained. Physicochemical parameters (viscosity, acid, iodine and saponification values) were evaluated to determine the biodiesel quality. The fatty acid profile was determined by gas chromatography with flame ionization detection (GC-FID). Eleven chalcones having different substituents were synthesized, characterized by Fourier transform infrared (FT-IR) and gas chromatography coupled to mass spectrometry (GC-MS), and their purities were determined by GC-MS and melting point. The evaluation of the antioxidant activity of these chalcones was performed using the methods of DPPH and chemiluminescence, the chalcones that showed the highest antioxidant activity in in vitro tests were added to biodiesel, wich had its oxidative stability measured in RancimatVDM Verlag, Dudweiler Landstraße 99, 66123 Saarbrücken 56 pp. Englisch. N° de réf. du vendeur 9783659752322
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Vendeur : preigu, Osnabrück, Allemagne
Taschenbuch. Etat : Neu. Evaluation of chalcones in the biodiesel oxidative process | Caroline Rockembach (u. a.) | Taschenbuch | 56 S. | Englisch | 2015 | LAP LAMBERT Academic Publishing | EAN 9783659752322 | Verantwortliche Person für die EU: preigu GmbH & Co. KG, Lengericher Landstr. 19, 49078 Osnabrück, mail[at]preigu[dot]de | Anbieter: preigu. N° de réf. du vendeur 104341609
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