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. 2020 Nov 24;12(12):739. doi: 10.3390/toxins12120739

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Chromatogram presenting the clean-up efficiency of the on-line SPE-HPLC method. Overloading of the column is observed even with a 10 μL direct injection (no SPE step) in comparison with 50 μL of Tokaj wine loaded on the extraction column and mass reduction during the on-line SPE step. Extraction: Ascentis Express C18 guard column, washing mobile phase: 30% MeOH in 0.5% aqueous acetic acid; time of washing 2 min. Separation: Kinetex Phenyl-Hexyl analytical column; mobile phase: acetonitrile and 0.5% aqueous acetic acid, gradient elution.