Correcting mass isotopomer distributions for naturally occurring isotopes
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Updated: Sep 29, 2026

Workflow Based on the Combination of Isotopic Tracer Experiments to Investigate Microbial Metabolism of Multiple Nutrient Sources
Published on: January 22, 2018
Wouter A van Winden1, Christoph Wittmann, Elmar Heinzle
1Department of Bioprocess Technology, Faculty of Applied Sciences, Delft University of Technology, The Netherlands. W.A.VanWinden@tnw.tudelft.nl
Abstract:
In one method of metabolic flux analysis, simulated mass spectrometry data is fitted to measured mass distributions of metabolites that are isolated from cultures with defined feeding of (13)C-labeled substrates. Doing so, simulated mass distributions must be corrected for the presence of naturally occurring isotopes. A method that was recently introduced for this purpose consists of consecutive correction steps for each isotope of each element in the considered compound. Here we show that all isotopes of each individual element must, however, be corrected in one single step. Furthermore, it is shown that the source of information with respect to isotopic compositions of the elements needs to be chosen with care.
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