A fast, sensitive method for the simultaneous determination of alpha-tocopherol and alpha-tocopheryl acetate in mixed micelles. 2005

Stéphane Castan, and Claude Villard, and Stefan Jakob, and Antoine Puigserver, and El Hassan Ajandouz
Institut Méditerranéen de Recherche en Nutrition, case 342, INRA-UMR 1111, Faculté des Sciences et Techniques de Saint-Jérôme, Avenue Escadrille Normandie Niemen, France.

This report improves analytical procedures to investigate the behaviour of the two Vitamin E forms, alpha-tocopherol (Tol) and alpha-tocopheryl acetate (Tac), in model systems mimicking the intestinal medium. We describe how to prepare mixed micelles as vehicle for Tac and Tol and the HPLC method for their quantification in the micelles. Tac and Tol were extracted using ethanol-hexane-drying procedure, whereas the separation and detection were performed in methanol and by UV method, respectively. Both compounds were eluted in less than 4 min. In the range between 1.7 microM and 54 microM of Tac or Tol in the micelles, their recovery were 89% and 81%, respectively, with correlation coefficient over 0.99 and R.S.D. of less than 7.2% in all cases. Limits of detection and quantification for Tac and Tol in mixed micelles ranged between 1 microM and 2 microM and between 3 microM and 5 microM, respectively. The behaviours of Tac and Tol were quite different during the extraction procedure and both were influenced by the vitamin concentration and the relative volume of organic solvents.

UI MeSH Term Description Entries
D008823 Micelles Particles consisting of aggregates of molecules held loosely together by secondary bonds. The surface of micelles are usually comprised of amphiphatic compounds that are oriented in a way that minimizes the energy of interaction between the micelle and its environment. Liquids that contain large numbers of suspended micelles are referred to as EMULSIONS. Micelle
D002851 Chromatography, High Pressure Liquid Liquid chromatographic techniques which feature high inlet pressures, high sensitivity, and high speed. Chromatography, High Performance Liquid,Chromatography, High Speed Liquid,Chromatography, Liquid, High Pressure,HPLC,High Performance Liquid Chromatography,High-Performance Liquid Chromatography,UPLC,Ultra Performance Liquid Chromatography,Chromatography, High-Performance Liquid,High-Performance Liquid Chromatographies,Liquid Chromatography, High-Performance
D004355 Drug Stability The chemical and physical integrity of a pharmaceutical product. Drug Shelf Life,Drugs Shelf Lives,Shelf Life, Drugs,Drug Stabilities,Drugs Shelf Life,Drugs Shelf Live,Life, Drugs Shelf,Shelf Life, Drug,Shelf Live, Drugs,Shelf Lives, Drugs
D012680 Sensitivity and Specificity Binary classification measures to assess test results. Sensitivity or recall rate is the proportion of true positives. Specificity is the probability of correctly determining the absence of a condition. (From Last, Dictionary of Epidemiology, 2d ed) Specificity,Sensitivity,Specificity and Sensitivity
D013056 Spectrophotometry, Ultraviolet Determination of the spectra of ultraviolet absorption by specific molecules in gases or liquids, for example Cl2, SO2, NO2, CS2, ozone, mercury vapor, and various unsaturated compounds. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed) Ultraviolet Spectrophotometry
D024502 alpha-Tocopherol A natural tocopherol and one of the most potent antioxidant tocopherols. It exhibits antioxidant activity by virtue of the phenolic hydrogen on the 2H-1-benzopyran-6-ol nucleus. It has four methyl groups on the 6-chromanol nucleus. The natural d form of alpha-tocopherol is more active than its synthetic dl-alpha-tocopherol racemic mixture. 3,4-Dihydro-2,5,7,8-tetramethyl-2-(4,8,12-trimethyltridecyl)-2H-1-benzopyran-6-ol,R,R,R-alpha-Tocopherol,Tocopherol Acetate,Tocopherol Succinate,Tocopheryl Acetate,Vitamin E Succinate,alpha-Tocopherol Acetate,alpha-Tocopherol Hemisuccinate,alpha-Tocopherol Succinate,alpha-Tocopheryl Calcium Succinate,d-alpha Tocopherol,d-alpha-Tocopheryl Acetate,Acetate, Tocopherol,Tocopherol, d-alpha,alpha Tocopherol,alpha Tocopherol Acetate,alpha Tocopherol Hemisuccinate,alpha Tocopherol Succinate,alpha Tocopheryl Calcium Succinate,d alpha Tocopherol,d alpha Tocopheryl Acetate
D024505 Tocopherols A collective name for a group of closely related lipids that contain substitutions on the 2H-1-benzopyran-6-ol nucleus and a long hydrocarbon chain of isoprenoid units. They are antioxidants by virtue of the phenolic hydrogen. Tocopherols react with the most reactive form of oxygen and protect unsaturated fatty acids from oxidation. Tocopherol,Abortosan,Antioxidans E-Hevert,Aquasol E,Auxina E,Bio E,Biopto-E,Biosan,Bioweyxin,Dal-E,Davitamon,Dermorelle,Detulin,E Vitamin E,E-Mulsin,E-Vicotrat,E-Vitamin-Ratiopharm,E-ferol,EUNOVA Vitamin E,Ecoro,Elex Verla,Embial,Ephynal,Eplonat,Equivit E,Eusovit,Evion,Hydrovit E,Lasar,Malton E,Micorvit E,Mowivit Vitamin E,Puncto E,Richtavit E,Sanavitan S,Snow-E Muscle, Energy & Feritility,Spondyvit,Tocolion,Tocopa,Tocopharm,Tocopherol Bayer,Tocovital,Togasan Vitamin E,Unique E,Uno-Vit,Vibolex,Vit E hydrosol,Vit. E Stada,Vita-E,Vita-Plus E,Vitagutt Vitamin E,Vitamin E AL,Vitamin E Natur,Vitamin E Sanum,Vitamin E Suspension,Vitamin E-mp,Vitamin-E Dragees,Vitamin-E EVI-MIRALE,Vitamine E GNR,Vitazell,Dal E,E Mulsin,E Vicotrat,Uno Vit,UnoVit,Vita E,Vita Plus E,VitaE,VitaPlus E,Vitamin E Dragees,Vitamin E EVI MIRALE,Vitamin E mp,Vitamin E, Mowivit,Vitamin E, Togasan,Vitamin E, Vitagutt,Vitamin Emp,VitaminE EVIMIRALE

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