Resolving Enantiomers of 2-Hydroxy Acids by Nuclear Magnetic Resonance

Anal Chem. 2022 Sep 13;94(36):12286-12291. doi: 10.1021/acs.analchem.2c00490. Epub 2022 Aug 30.

Abstract

Biologically important 2-hydroxy carboxylates such as lactate, malate, and 2-hydroxyglutarate exist in two enantiomeric forms that cannot be distinguished under achiral conditions. The D and L (or R, S) enantiomers have different biological origins and functions, and therefore, there is a need for a simple method for resolving, identifying, and quantifying these enantiomers. We have adapted and improved a chiral derivatization technique for nuclear magnetic resonance (NMR), which needs no chromatography for enantiomer resolution, with greater than 90% overall recovery. This method was developed for 2-hydroxyglutarate (2HG) to produce diastereomers resolvable by column chromatography. We have applied the method to lactate, malate, and 2HG. The limit of quantification was determined to be about 1 nmol for 2HG with coefficients of variation of less than 5%. We also demonstrated the method on an extract of a renal carcinoma bearing an isocitrate dehydrogenase-2 (IDH2) variant that produces copious quantities of 2HG and showed that it is the D enantiomer that was exclusively produced. We also demonstrated in the same experiment that the lactate produced in the same sample was the L enantiomer.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Humans
  • Hydroxy Acids
  • Isocitrate Dehydrogenase
  • Kidney Neoplasms*
  • Lactates
  • Magnetic Resonance Spectroscopy
  • Malates*

Substances

  • Hydroxy Acids
  • Lactates
  • Malates
  • Isocitrate Dehydrogenase