Classical LNP manufacturing relies on microfluidic mixing devices or T-junction systems to achieve controlled LNP assembly at defined flow rates. While these approaches deliver highly reproducible particles, they require specialised equipment that is often unavailable in standard biology laboratories. For early-stage research — initial in vitro screening in cell culture and exploratory in vivo studies in mice — a pipette-based, vortex-assisted protocol provides a rapid, accessible, and surprisingly robust alternative that requires no capital equipment beyond a standard laboratory vortex mixer.
The method exploits the same self-assembly thermodynamics as microfluidic approaches. When an ethanol solution of the four lipid components is rapidly diluted into aqueous buffer containing RNA, the hydrophobic collapse of the ionizable lipids drives simultaneous electrostatic condensation of the RNA and formation of a lipid-enclosed nanoparticle. Controlled by hand mixing or a vortex mixer at a fixed speed, particles in the 80–180 nm range can be routinely obtained, fully suitable for transfection of cultured cells and for intravenous or intramuscular injection in mouse models.
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