Extraction of fat-soluble vitamins

Luque-García, José L.; Castro, M.D. Luque de

doi:10.1016/s0021-9673(01)01118-9

Cited by 64 publications

(28 citation statements)

References 63 publications

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“…The extract can then be used for analysis by liquid chromatography (HPLC) or other analytical methods, either directly or after additional concentration/cleanup steps, or evaporation of the solvent and re-dissolution into a solvent compatible with the polar mobile phase. 5,6 Several different quantification procedures have been reported in the literature for the determination of vitamins A and E in biological materials and food samples.…”

Section: Introductionmentioning

confidence: 99%

“…5,6 Chemiluminescence (CL) as a technique can be used for determining trace and ultra-trace concentrations of inorganic and organic species (like drugs or pesticides) in a variety of industrial, clinical and environmental matrices. An analytical advantage of CL includes high sensitivity, very low limits of detection and a wide linear range.…”

Section: Introductionmentioning

confidence: 99%

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Flow-Injection Determination of Retinol and Tocopherol in Pharmaceuticals with Acidic Potassium Permanganate Chemiluminescence

et al. 2009

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Flow-Injection Determination of Retinol and Tocopherol in Pharmaceuticals with Acidic Potassium Permanganate Chemiluminescence

et al. 2009

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“…[20][21][22] SPE has some advantages over the conventional extraction techniques for example liquid-liquid extraction such as simplicity, quick extraction, purer extracts free from interference, lower operational price, selective extraction, small volume consumption of high purity solvents and it allows the extraction and sampling in the field for later transport and storage. 23 According to LuqueGarcía and Luque de Castro, 24 other advantages of SPE are the decrease of contamination problems and the easy automation of the process.…”

Section: Resultsmentioning

confidence: 99%

Development and validation of a multi-residue analytical methodology to determine the presence of selected pesticides in water through liquid chromatography

Brondi¹,

Lanças²

2005

J. Braz. Chem. Soc.

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No presente trabalho uma metodologia analítica é descrita para determinar a presença de multiresiduos de pesticidas utilizados na cultura da cana de açúcar (tebuthiuron, hexazinona, diuron, 2,4-D e ametrina), em fontes de água de abastecimento. Os analitos foram isolados da matriz água, através das seguintes técnicas: extração liquido-liquido (LLE), utilizando diclorometano como solvente; extração em fase sólida (SPE), utilizando C18 como suporte sólido e acetonitrila como solvente para condicionamento da fase e eluição dos analitos; e extração com fluido supercrítico (SFE), utilizando C18 como suporte sólido e CO 2 no estado supercrítico como solvente de extração. Análise cromatográfica foi feita por cromatografia liquida de alta eficiência (HPLC) com detector ultravioleta, utilizando acetonitrila/água como fase móvel. Dentre as três técnicas de extração avaliadas, os melhores resultados foram obtidos com extração liquido-liquido e extração em fase sólida.In the present work an analytical methodology is described to determine the presence of multiresidues of selected pesticides used in sugar-cane cultures (tebuthiuron, hexazinone, diuron, 2,4-D and ametrine), in source of drinking water. The analytes were isolated from the water matrix through the following techniques: liquid-liquid extraction (LLE) using dichloromethane as solvent; solid phase extraction (SPE) using C 18 as solid support and acetonitrile as solvent to condition the solid phase and elution of the analytes; and supercritical fluid extraction (SFE) using C18 as solid support and CO 2 in supercritical state as extractant solvent. The chromatographic analysis was done by high performance liquid chromatography (HPLC) with an ultraviolet detector and using acetonitrile/ water as mobile phase. Among the three evaluated extraction techniques, the best results were obtained with both liquid-liquid extraction and solid phase extraction.

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“…However it is reported that pitfalls of extraction process from matrix occur due to interferences of substances without vitamin activity present in food Luque-García and Luque de Castro (2001). In EuroFIR GAMA, analytical procedures are described in a stepwise approach, first extraction of component from food then instrumental analysis and quality control of the method applied in the laboratory.…”

Section: Vitaminsmentioning

confidence: 99%