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Effect of mobile phase on resolution of the isomers and homologues of tocopherols on a triacontyl stationary phase

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Abstract

Reversed-phase liquid chromatographic (RPLC) separation of isomers and homologues of similar polarity is challenging. Tocopherol isomers and homologues are one such example. α, β, γ, and δ-tocopherols have been successfully separated by RPLC on triacontyl (C30) stationary phase. System suitability was tested by using four mobile phases, and observed chromatographic separations of β and γ-tocopherols were compared. Comparison indicated that methanol–tert-butyl methyl ether (TBME) 95:5 (v/v) at a flow rate of 0.75 mL min−1 was the best mobile phase. Detection systems were also evaluated on the basis of limit of quantification; it was concluded that fluorescence detection was best. The method was validated by analysis of two homologues and two isomers of tocopherol in sesame, maize, and soybean samples. MS coupled with an ESI interface in negative-ion mode [M − H]− was used for identification of individual components. It was concluded that addition of TBME to methanol was required to enhance the separation of β and γ-tocopherols, although methanol alone provided similar results. The applicability of the method to cereal, pulse, and oilseed samples was confirmed. The reproducibility of the procedure was good, with relative standard deviations in the range 1.7–3.9 %. Recovery of tocopherols added to sesame samples ranged from 91 to 99 %.

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Acknowledgments

The authors acknowledge the support provided by the Head, Division of Agricultural Chemicals, Indian Agricultural Research Institute, New Delhi, India.

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Authors and Affiliations

  1. Division of Agricultural Chemicals, Indian Agricultural Research Institute, New Delhi, 110 012, India

    Supradip Saha, Suresh Walia & Aditi Kundu

  2. National Bureau of Plant Genetic Resources, New Delhi, 110 012, India

    Niti Pathak

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  1. Supradip Saha
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  2. Suresh Walia
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  3. Aditi Kundu
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Correspondence to Supradip Saha.

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Saha, S., Walia, S., Kundu, A. et al. Effect of mobile phase on resolution of the isomers and homologues of tocopherols on a triacontyl stationary phase. Anal Bioanal Chem 405, 9285–9295 (2013). https://doi.org/10.1007/s00216-013-7336-9

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