... fragments in E. coli mutants grown on 20% [U-13C] and 80% unlabeledglucose.Ó FEBS 2003 Metabolic flux profiling in E. coli (Eur. J. Biochem. 270) 891 Metabolic flux profiling of Escherichia coli mutants ... conducted in shakeflasks. Metabolic flux ratio analysis of E. coli mutants of central metabolism The above developed metabolic flux ratio analysis by GC-MS was used for metabolic flux profiling of nonlethalmutations ... glycine, histidine, isoleucine, leucine, phenyl-alanine, proline, serine, threonine, tyrosine, and valine for[U-13C]glucose experiments and aspartate, isoleucine, leu-cine, phenylalanine,...