Abstract
The combined use of two-dimensional (2D) nuclear magnetic resonance (NMR) spectroscopy and biosynthetic fractional 13 C labeling of proteinogenic amino acids represents a novel approach for monitoring the response of metabolic fluxes to genetic manipulations or to variations of bioprocess parameters. Non-random 13 C-labeling patterns arising from incorporation of intact two- or three-carbon fragments from uniformly 13 C-labeled source molecules into the amino acids are identified by 2D NMR, and are quantitatively related to the steady-state carbon fluxes from the source molecules to the final product. The relatively low cost of isotopes, and limited requirements for manpower and NMR instrument time make this approach of practical use for optimizing bioprocess parameters.
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