Selected Publication:

SHR Neuro Cancer Cardio Lipid Metab Microb

Schittmayer, M; Birner-Gruenberger, R; Zamboni, N.
Quantification of cellular folate species by LC-MS after stabilization by derivatization.
Anal Chem. 2018; Doi: 10.1021/acs.analchem.8b00650 [OPEN ACCESS]
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Leading authors Med Uni Graz

Schittmayer-Schantl Matthias

Co-authors Med Uni Graz

Birner-Grünberger Ruth

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Abstract:

Folate cofactors play a key role in one-carbon metabolism. Analysis of individual folate species is hampered by the low chemical stability and high inter-convertibility of folates which can lead to severe experimental bias. Here we present a complete workflow that employs simultaneous extraction and stabilization of folates by derivatization. We perform reductive methylation employing stable isotope labelled reagents to retain information on position and redox state of one carbon units as well as the redox state of the pteridine ring. The derivatives are analyzed by a targeted LC(HILIC)-MS/MS method without the need for deconjugation, thereby also preserving the glutamation state of folates. The presented method does not only improve analyte coverage and sensitivity as compared to other published methods, it also greatly simplifies sample handling and storage. Finally, we report differences in the response of bacterial and mammalian systems to pharmacological inhibition of dihydrofolate reductase.

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