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Related Experiment Video

Updated: Jul 4, 2026

Constant Pressure-controlled Extrusion Method for the Preparation of Nano-sized Lipid Vesicles

Constant Pressure-controlled Extrusion Method for the Preparation of Nano-sized Lipid Vesicles

Published on: June 22, 2012

Elucidating lipid nanoparticle properties and structure through biophysical analyses.

Marshall S Padilla¹, Sarah J Shepherd¹, Andrew R Hanna¹

¹Department of Bioengineering, University of Pennsylvania, Philadelphia, PA, USA.

Nature Biotechnology

|October 23, 2025

Summary

Advanced biophysical methods reveal lipid nanoparticle (LNP) polydispersity, crucial for predicting in vitro and in vivo transfection and guiding LNP design.

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Published on: June 22, 2012

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Formulating and Characterizing Lipid Nanoparticles for Gene Delivery using a Microfluidic Mixing Platform

Formulating and Characterizing Lipid Nanoparticles for Gene Delivery using a Microfluidic Mixing Platform

Published on: February 25, 2021

Area of Science:

Biophysics
Nanotechnology
Drug Delivery

Background:

Lipid nanoparticles (LNPs) are vital for clinical applications, but their precise characterization is challenging.
Traditional methods like dynamic light scattering lack the resolution to quantify LNP physicochemical properties accurately.
Understanding LNP properties is key to optimizing targeting, potency, and minimizing side effects.

Purpose of the Study:

To apply advanced solution-based biophysical techniques for high-resolution structural characterization of polydisperse LNP formulations.
To investigate the influence of lipid composition and formulation methods on LNP physicochemical properties.
To establish structure-function relationships for predicting LNP transfection efficiency.

Main Methods:

Sedimentation velocity analytical ultracentrifugation
Field-flow fractionation coupled with multiangle light scattering
Size-exclusion chromatography with synchrotron small-angle X-ray scattering

Main Results:

LNPs exhibit inherent polydispersity in size, RNA loading, and shape, influenced by formulation technique and lipid composition.
Emerging biophysical methods provide higher resolution data beyond simple size and polydispersity.
Physicochemical characteristics correlate with mRNA translation, enabling prediction of LNP transfection in vitro and in vivo.

Conclusions:

Solution-based biophysical methods are essential for detailed LNP structural characterization.
These advanced techniques facilitate the understanding of LNP structure-function relationships.
This knowledge will enable the development of new design rules for improved LNP delivery systems.