Abstract: The present invention includes a method of identifying 2-hydroxygluterate (2-hg) metabolites in a sample comprising: obtaining the sample from a patient; extracting the 2-hydroxygluterate (2-hg) metabolites from the sample without modifying a chiral center of the 2-hg metabolites; separating the one or more 2-hg metabolites in the sample using a chiral gas chromatography capillary column; and quantitating an amount of 2-hg metabolites in the sample using mass spectrometry.

Abstract: The present invention includes a method of identifying 2-hydroxygluterate (2-hg) metabolites in a sample comprising: obtaining the sample from a patient; extracting the 2-hydroxygluterate (2-hg) metabolites from the sample without modifying a chiral center of the 2-hg metabolites; separating the one or more 2-hg metabolites in the sample using a chiral gas chromatography capillary column; and quantitating an amount of 2-hg metabolites in the sample using mass spectrometry.

Abstract: Analytical methods using hydrogen/deuterium exchange are provided which reduce or eliminate the back-exchange of deuterium for hydrogen. The methods, which are useful in protein and peptide mapping, include the steps of (a) providing a peptide or protein comprising a solvent accessible hydrogen; (b) exchanging the solvent accessible hydrogen for a deuterium; (c) separating the peptide or protein with supercritical fluid chromatography; and (d) analyzing by mass spectrometry the mass of the separated peptide or protein. Supercritical fluid chromatography enables the observation of fast exchanging hydrogen atoms missed using conventional liquid chromatography methods.

Abstract: A method is provided for quantifying endogenous sphingolipids in a biological system. The method includes preparing one or more isotope labeled amino acids; introducing the isotope labeled amino acids into a biological system; extracting and separating a sphingolipid-containing fraction from the biological system; and quantifying the amount of endogenous sphingolipids in the biological system. The isotope-labeled amino acid may include a non-essential amino acid, and the method may further include adding an amino acid synthesis inhibitor into the biological system. Systems and kits for quantifying endogenous sphingolipids also are disclosed.

Abstract: Analytical methods using hydrogen/deuterium exchange are provided which reduce or eliminate the back-exchange of deuterium for hydrogen. The methods, which are useful in protein and peptide mapping, include the steps of (a) providing a peptide or protein comprising a solvent accessible hydrogen; (b) exchanging the solvent accessible hydrogen for a deuterium; (c) separating the peptide or protein with supercritical fluid chromatography; and (d) analyzing by mass spectrometry the mass of the separated peptide or protein. Supercritical fluid chromatography enables the observation of fast exchanging hydrogen atoms missed using conventional liquid chromatography methods.

Abstract: Analytical methods using hydrogen/deuterium exchange are provided which reduce or eliminate the back-exchange of deuterium for hydrogen. The methods, which are useful in protein and peptide mapping, include the steps of (a) providing a peptide or protein comprising a solvent accessible hydrogen; (b) exchanging the solvent accessible hydrogen for a deuterium; (c) separating the peptide or protein with supercritical fluid chromatography; and (d) analyzing by mass spectrometry the mass of the separated peptide or protein. Supercritical fluid chromatography enables the observation of fast exchanging hydrogen atoms missed using conventional liquid chromatography methods.