Metabolic flux analysis
Japanese: フラックス解析（代謝フラックス解析）
A technique for quantitatively measuring the flow rate of substances through metabolic pathways. Advanced technology for visualizing the 'traffic flow' of fermentation.
Metabolic flux analysis (MFA) quantifies the flow rates (fluxes) of substances through metabolic pathways—visualizing 'traffic volumes' across metabolic routes.
By feeding microorganisms substrates labeled with stable isotopes (¹³C, ¹⁵N) and tracking labeling patterns in metabolites via mass spectrometry, fluxes through each pathway can be estimated. This technology enables drawing the complete 'map' of microbial metabolism.
For brewing optimization, flux analysis is a powerful tool for identifying 'which step is the bottleneck.' To increase miso's umami, for instance, one would seek conditions that boost the protein breakdown flux. The era of data-driven brewing optimization—replacing reliance on experience and intuition—has begun.