Denaturing SEC Characterization of Lipid Nanoparticle Compositions
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Solution Overview
Problem
Current methods for characterizing lipid nanoparticle (LNP) compositions, particularly for nucleic acid delivery systems, face challenges due to light scattering by the LNP shell and incompatibility with existing chromatography techniques, leading to incomplete elution and lack of reproducibility in measuring critical quality attributes.
Innovation Solution
A method utilizing size-exclusion chromatography with a denaturing mobile phase comprising a detergent and organic solvent for direct injection of formulated LNPs, allowing complete disruption of the LNP shell and detection of nucleic acid payloads using UV absorbance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If UV absorption is used to detect nucleic acids, then detection sensitivity is improved, but light scattering by the LNP shell causes measurement inaccuracy
Solution Approach 1:
The patent extracts the nucleic acid payload from the LNP shell environment by using chromatographic separation. The LNP shell is disrupted during sample preparation, releasing the nucleic acid payload which then separates from the shell components during chromatography, allowing detection without shell interference
Solution Approach 2:
The patent introduces an intermediary chromatographic separation system between the LNP sample and the UV detector. The chromatography column acts as a mediator that separates nucleic acids from the LNP shell components, allowing the detector to measure only the nucleic acid signal without scattering interference
2Manufacturing precision
If reverse phase liquid chromatography is used to characterize LNP, then separation capability is improved, but detergent incompatibility with RPLC columns causes method failure
Solution Approach 1:
Instead of using RPLC and trying to make it compatible with detergents, the patent inverts the approach by using size-exclusion chromatography (SEC) which is inherently compatible with detergent-containing mobile phases. This reverses the conventional wisdom that RPLC is the standard for LNP characterization
3Manufacturing precision
If conventional chromatography methods are used, then separation is achieved, but incomplete elution of nucleic acid payloads reduces measurement reliability
Solution Approach 1:
The patent changes the mobile phase parameters by including detergents and organic solvents at specific concentrations that disrupt the LNP shell and promote complete elution of nucleic acid payloads. The mobile phase composition is optimized to ensure full release and detection of payloads
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables robust and reproducible characterization of LNPs and their payloads without pre-treatment, simplifying workflows and improving quantification of nucleic acids, including impurities and degradation products.
Implementation Method 1
flowing the sample through the size-exclusion chromatography column using a mobile phase
Implementation Method 2
wherein the detergent and the organic solvent are at concentrations sufficient to denature the LNP
Implementation Method 3
detecting with an ultraviolet detector the lipid shell and the nucleic acid payload eluted from the column
Data Source
AI summary
Disclosed herein are methods for characterizing lipid nanoparticles (LNPs) using size-exclusion chromatography. The disclosed methods utilize a denaturing mobile phase (i.e., denaturing SEC) to afford robust disruption of LNPs and to permit the direct injection of LNPs onto a size-exclusion chromatography column. Accordingly, said methods allow for the characterization of formulated LNPs without pre-treatment or other modifications.