Sample Preparation and Determination of Ginkgo Terpene Trilactones in Selected Beverage, Snack, and Dietary Supplement Products by Liquid Chromatography with Evaporative Light-Scattering Detection
| Autor: | Chien M. Wai, Catharina Y W Ang, Thomas M. Heinze, Yanyan Cui, Michael Dinovi, Antonia Mattia, Qingyong Lang |
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| Rok vydání: | 2004 |
| Předmět: |
Pharmacology
Chromatography biology Chemistry Supercritical fluid extraction biology.organism_classification Analytical Chemistry law.invention chemistry.chemical_compound Bilobalide law Standard addition Environmental Chemistry Flame ionization detector Sample preparation Ginkgoales Gas chromatography Ginkgolides Agronomy and Crop Science Food Science |
| Zdroj: | Journal of AOAC INTERNATIONAL. 87:815-826 |
| ISSN: | 1944-7922 1060-3271 |
| DOI: | 10.1093/jaoac/87.4.815 |
| Popis: | Ginkgo biloba leaf extract has been widely used in dietary supplements and more recently in some foods and beverages. Sample preparation procedures for determination of ginkgo terpene trilactones (including bilobalide and ginkgolides A, B, C, and J) in various sample matrixes were developed in this study. Ginkgo leaves and capsules were extracted with 5% KH2PO4 aqueous solution under sonication. Tea bags were extracted with boiling water, whereas drink samples were taken directly from the bottles. After filtration and the addition of NaCl to approximately 30% (w/v), the terpene trilactones in aqueous solutions were quantitatively extracted with ethyl acetate–tetrahydrofuran (4 + 1, v/v). Puff samples (a cereal-based fried snack item) were first defatted by using hexane or by using supercritical fluid extraction and then extracting under sonication with methanol–acetic acid (99 + 1, v/v). After evaporation of the organic phase, the terpene trilactones were redissolved in methanol and determined on a C18 reversed-phase column by liquid chromatography (LC) with evaporative light-scattering detection. The method of standard additions and gas chromatography with flame ionization detection were used for method validation. For most samples, the relative standard deviation was |
| Databáze: | OpenAIRE |
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