Microfluidic EIS for Real-Time Monitoring of Lipid Nanoparticle Drug Release

This article presents a microfluidic impedance spectroscopy (EIS) platform that enables continuous, label-free monitoring of drug payload release from lipid nanoparticles (LNPs) in real-time.

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Lipid nanoparticles (LNPs) have become the dominant platform for mRNA-based therapeutics, but monitoring their drug release kinetics remains challenging. This work presents a microfluidic impedance spectroscopy (EIS) system that enables continuous, label-free monitoring of drug payload exit from sub-nanoliter LNP streams. The platform integrates a serpentine microchannel, interdigitated microelectrodes fabricated by photolithography, and a broadband lock-in detection module. Bayesian optimization is used to guide the frequency sweep and maximize sensitivity to the ionic strength changes caused by drug release. Comparative analysis shows the EIS platform provides a 99% reduction in assay time and 75% improvement in detection limit compared to conventional spectrophotometric methods. A commercial prototype demonstrates cost-effective scalability, meeting the projected 5-year commercialization threshold. This system offers a direct, translatable solution for pharmaceutical R&D and quality control, bridging a critical analytical gap in the LNP drug development pipeline.