Abstract
A simple and rapid assay using pyridoxal 5'-phosphate (PLP) as a derivatizing reagent was developed for the simultaneous determination of homocysteine (Hcy) and cysteine (Cys) in human plasma. Derivatization with PLP affords UV-absorbing tetrahydrothiazine and thiazolidine derivatives of Hcy and Cys, respectively. Separation of these derivatives was achieved in 5 min using a hydrophilic interaction liquid chromatography, followed by UV detection at 330 nm. Linearity in detector response was observed over the range of 0.25–20 μM for Hcy and 10–300 μM for Cys. The limit of quantification (LOQ) values for Hcy and Cys were 0.25 and 2.5 μM, respectively. The method was successfully applied to plasma samples donated by apparently healthy volunteers.
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Abbreviations
- Cys:
-
Cysteine
- Hcy:
-
Homocysteine
- TCEP:
-
Tris(2-carboxyethyl)phosphine hydrochloride
- PLP:
-
Pyridoxal 5'-phosphate
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Acknowledgments
This work was supported in part by grants from the National Science Center (2012/07/B/ST5/00765, 2012/07/B/NZ7/01178, 2013/09/D/ST5/03909, 2013/09/B/NZ5/02794, 2013/11/B/NZ1/00091), the American Heart Association (0855919D, 12GRNT9420014), the University of Łódź, and the Marshal of Łódzkie Voivodeship (3/SMN/2015).
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The University of Łódź Ethical Committee approved the study and all participants provided written informed consent.
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Głowacki, R., Stachniuk, J., Borowczyk, K. et al. Quantification of homocysteine and cysteine by derivatization with pyridoxal 5'-phosphate and hydrophilic interaction liquid chromatography. Anal Bioanal Chem 408, 1935–1941 (2016). https://doi.org/10.1007/s00216-016-9308-3
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DOI: https://doi.org/10.1007/s00216-016-9308-3