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. 2020 May 18;21(10):3548. doi: 10.3390/ijms21103548

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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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Stability of HPPTCA in human plasma spiked with the analyte (100 µmol L⁻¹) at room temperature, expressed as a peak area. Samples were processed according to previously published methods based on HPLC-UV [21,22].