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Of the hyphenated techniques used for metabolic profiling of cell and tissue extracts, GC/MS is in some ways advantageous as it allows the simultaneous fingerprinting of chemically very different metabolites, and the electron impact mass spectra recorded in many cases lead to unambiguous identification of the compounds. However, prior to chromatography, the hydrophilic substances of the cell extracts have to be converted to vaporizable derivatives, the mass spectra of which often are not known or not listed in the available spectral libraries, even if they are derived from simple biochemicals. Thus, numerous chromatographic peaks remain as yet unidentified. Attempts to identify these peaks afford the acquisition of more data on these compounds. The value of  in vivo  labeling of metabolites with  13 C and  15 N for this purpose is described.

biological chemistry

In vivo  labeling with stable isotopes as a tool for the identification of unidentified peaks in the metabolome analysis of  Corynebacterium glutamicum  by GC/MS