Liquid Chromatographic Determination of Tocopherols and Tocotrienols in Vegetable Oils, Formulated Preparations, and Biscuits

Author:

Bonvehi Josep Serra1,Coll Francesc Ventura2,Rius Imma Alsina3

Affiliation:

1. Research and Development Department of Nederland, PO Box 34, 08890 Viladecans, Barcelona, Spain

2. Nabisco Iberia, PO Box 2022, 08080 Barcelona, Spain

3. Agricultural and Food Laboratory (Generalitat of Catalonia), 08348 Cabrils, Barcelona, Spain

Abstract

Abstract A precise and selective liquid chromatographic procedure for determining tocopherol and tocotrienol isomers in vegetable oils, formulated preparations, and biscuits was developed and validated. The proposed method quantitates vitamin E in better conditions of recoverability and reproducibility than the standard saponification procedure. Tocopherols and tocotrienols were extracted in hexane from vegetable oils, passed through a silica Sep-pak, chromatographed on a μ-Bondapak C18 column with a mobile phase of methanol–water (95 + 5, v/v), identified at 292 nm, and detected with fluorescence procedure (excitation 296 nm, and emission 330 nm). The correlation coefficient on the calibration curve was 0.9995 over the range of 0.1 to 100 μg/mL. Overall recovery of vitamin E isomers was 93%; coefficients of variation for intra- and interday precision, <2.25%. The results obtained from extraction methods 1 (with saponification) and 2 (without saponification) were compared by ANOVA test. Significant differences appeared between vitamin E isomers (p ≤ 0.05).

Publisher

Oxford University Press (OUP)

Subject

Pharmacology,Agronomy and Crop Science,Environmental Chemistry,Food Science,Analytical Chemistry

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