Abstract
We established a method to simultaneously determine RRR- and SRR-α-tocopherol (α-Toc) and their quinones in biological samples by chiral-phase high-performance liquid chromatography (HPLC). α-Toc had a shorter retention time than α-tocopherylquinones (α-TQ), and 2-ambo-α-Toc was completely separated into two peaks; the first peak was RRR-α-Toc and the second SRR-isomer by chiral HPLC connected Chiralcel OD-H column and Sumichiral OA4100 column. In contrast, of the two peaks of α-TQ, the first was the SRR-isomer. We also investigated differences in the distribution of RRR- and SRR-α-TQ in rat tissues after oral administration of 2-ambo-α-Toc by the above HPLC method. Rats deficient in vitamin E were divided into two groups, control and experimental, and tissues were collected at 3, 6, and 24 h after oral 2-ambo-α-Toc administration. The concentrations of RRR- and SRR-α-Toc and their quinones in plasma and each tissue were determined. The concentration of SRR-α-TQ in plasma and adrenal glands was not significantly different from RRR-α-TQ. However, the concentration of SRR-α-TQ in liver up to 6 h after oral administration was higher than that of RRR-α-TQ, and SRR- and RRR-α-TQ levels were similar at 24 h after oral administration. Therefore, we may assume that the formation of α-TQ in vivo was not different between RRR- and SRR-isomer and that it was not affected by the presence of α-Toc stereoisomers.
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Abbreviations
- HPLC:
-
high-performance liquid chromatography
- PMC:
-
2,2,5,7,8-pentamethyl-6-hydroxychroman
- TLC:
-
thin-layer chromatography
- α-Toc or γ-Toc:
-
α- or γ-tocopherol
- α-TQ:
-
α-tocopherylquinone
- α-TTP:
-
α-tocopherol transfer protein
- VLDL:
-
very low density lipoprotein
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Kiyose, C., Kaneko, K., Muramatsu, R. et al. Simultaneous determination of RRR- and SRR-α-tocopherols and their quinones in rat plasma and tissues by using chiral high-performance liquid chromatography. Lipids 34, 415–422 (1999). https://doi.org/10.1007/s11745-999-0380-x
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DOI: https://doi.org/10.1007/s11745-999-0380-x