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Increasing the productivity of IVT reaction with HPLC analytics

The cost of mRNA production is driven by IVT reagents, particularly the capping reagent. Optimization of mRNA yield is therefore crucial for lowering the cost of mRNA production. In order to monitor IVT reaction over time, we implemented a rapid at-line HPLC monitoring of consumption of NTPs with concomitant production of mRNA, with a sub-3 min read-out. Use of CIMac PrimaS analytical column allowed us to determine and adjust key IVT components that influence the kinetics of mRNA production and are critical for optimization of continuous addition of reagents, i.e. fed-batch IVT.