Liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS) is a highly specific and sensitive technique for measuring metabolites. However, coeluting components in tissue extracts can interfere with ionization at the interface of the LC and MS/MS phases, causing under- or overestimation of metabolite concentrations. Spiking of samples with known amounts of stable-isotope-labeled internal standards (SIL-IS) allows measurements of the corresponding metabolites to be corrected for such matrix effects. We describe criteria for selection of suitable SIL-IS and report the enzymatic synthesis and purification of nine SIL-IS for hexose-, pentose-, and triose-phosphates, UDP-glucose, and adenosine monophosphate (AMP). Along with commercially available SIL-IS for seven other metabolites, these were validated by LC-MS/MS analyses of extracts from leaves, nonphotosynthetic plant tissues, mouse liver, and cells of Chlamydomonas reinhardtii, Escherichia coli and baker's yeast (Saccharomyces cerevisiae). With only a few exceptions, spiking with SIL-IS significantly improved the reproducibility of LC-MS/MS-based metabolite measurements across a wide range of extract dilutions, indicating effective correction for matrix effects by this approach. With use of SIL-IS to correct for matrix effects, LC-MS/MS offers unprecedented scope for reliable determination of photosynthetic and respiratory intermediates in a diverse range of organisms.

• PMID: 26010726
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Journal Article | Research Support, Non-U.S. Gov't

Authors

Arrivault S, Guenther M, Fry SC, Fuenfgeld MM, Veyel D, Mettler-Altmann T, Stitt M, Lunn JE

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