Combination of saponification and dispersive liquid–liquid microextraction for the determination of tocopherols and tocotrienols in cereals by reversed-phase high-performance liquid chromatography
| Autor: | Hasanah Mohd Ghazali, Balakrishnan Shammugasamy, Kharidah Muhammad, Yogeshini Ramakrishnan |
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| Rok vydání: | 2013 |
| Předmět: |
Saponification value
Acetonitriles Liquid Phase Microextraction Tocopherols Sodium Chloride Biochemistry High-performance liquid chromatography Analytical Chemistry chemistry.chemical_compound Limit of Detection Sample preparation Tocopherol Carbon Tetrachloride Chromatography High Pressure Liquid Detection limit Analysis of Variance Chromatography Reverse-Phase Chromatography Plant Extracts Chemistry Tocotrienols Organic Chemistry Extraction (chemistry) Reproducibility of Results General Medicine Linear Models Tocotrienol Edible Grain Saponification |
| Zdroj: | Journal of Chromatography A. 1300:31-37 |
| ISSN: | 0021-9673 |
| Popis: | A simple sample preparation technique coupled with reversed-phase high-performance liquid chromatography was developed for the determination of tocopherols and tocotrienols in cereals. The sample preparation procedure involved a small-scale hydrolysis of 0.5g cereal sample by saponification, followed by the extraction and concentration of tocopherols and tocotrienols from saponified extract using dispersive liquid-liquid microextraction (DLLME). Parameters affecting the DLLME performance were optimized to achieve the highest extraction efficiency and the performance of the developed DLLME method was evaluated. Good linearity was observed over the range assayed (0.031-4.0μg/mL) with regression coefficients greater than 0.9989 for all tocopherols and tocotrienols. Limits of detection and enrichment factors ranged from 0.01 to 0.11μg/mL and 50 to 73, respectively. Intra- and inter-day precision were lower than 8.9% and the recoveries were around 85.5-116.6% for all tocopherols and tocotrienols. The developed DLLME method was successfully applied to cereals: rice, barley, oat, wheat, corn and millet. This new sample preparation approach represents an inexpensive, rapid, simple and precise sample cleanup and concentration method for the determination of tocopherols and tocotrienols in cereals. |
| Databáze: | OpenAIRE |
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