Page 240 - Multidimensional Chromatography
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234                                     Multidimensional Chromatography




























































                           Figure 10.9 Chromatograms of fortified coconut oil obtained by using (a) normal-phase
                           HPLC and (b) GPC/normal-phase HPLC. Peak identification is as follows: 1 (a,b), DL- -toco-
                           pheryl acetate, 2 (b), 2,6-di-tert-butyl-4-methylphenol; 2 (a) and 3 (b), retinyl acetate; 3 (a)
                           and 4 (b), tocol; 4 (a) and 5 (b), ergocalciferol. Reprinted from Analytical Chemistry, 60,
                           J. M. Brown-Thomas et al., ‘Determination of fat-soluble vitamins in oil matrices by multidi-
                           mensional high-performance liquid chromatography’, pp. 1929–1933, copyright 1988, with
                           permission from the American Chemical Society.
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