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Related Experiment Video

Updated: Jan 20, 2026

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High-resolution 13C metabolic flux analysis.

Christopher P Long1,2, Maciek R Antoniewicz3

  • 1Metabolic Engineering and Systems Biology Laboratory, Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, DE, USA.

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|September 1, 2019
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Summary

This study presents an improved protocol for 13C metabolic flux analysis (13C-MFA) to precisely quantify metabolic pathways. The method enhances accuracy and efficiency for applications in biotechnology and human health.

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Area of Science:

  • Metabolic Engineering and Systems Biology
  • Biotechnology and Microbiology

Background:

  • Precise quantification of metabolic pathway fluxes is crucial for metabolic engineering, biotechnology, and human health.
  • 13C metabolic flux analysis (13C-MFA) is the primary technique for determining intracellular fluxes.

Purpose of the Study:

  • To present an optimized protocol for 13C-MFA incorporating recent advancements.
  • To improve the precision and efficiency of intracellular flux quantification.

Main Methods:

  • Utilizes parallel 13C-labeled glucose tracer experiments in microbial cultures.
  • Employs gas chromatography-mass spectrometry (GC-MS) for isotopic labeling measurements of amino acids, glucose, and ribose.
  • Integrates advanced statistical analysis and specialized software (e.g., Metran) for flux estimation.

Main Results:

  • The protocol can be completed in 4 days with a standard deviation of ≤2% for quantified metabolic fluxes.
  • Demonstrates a substantial improvement in precision compared to previous 13C-MFA implementations.
  • Provides a case study using Escherichia coli ΔtpiA with comprehensive data and troubleshooting guidance.

Conclusions:

  • The presented 13C-MFA protocol offers a highly precise and efficient method for metabolic flux quantification.
  • The protocol is adaptable for both prokaryotic and eukaryotic systems.
  • This optimized approach facilitates advancements in various biological and medical fields.