Dextran SEC Mobile Phase for Accurate LNP Sizing
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Solution Overview
Problem
Current methods for analyzing lipid nanoparticles (LNPs) face challenges such as poor-quality separation, poor sample recovery, column fouling, and flow cell contamination during size exclusion chromatography, which affect the integrity and reproducibility of LNP characterization.
Innovation Solution
The use of a mobile phase comprising an aqueous buffer and a branched poly-α-d-glucoside, such as dextran, in size exclusion chromatography to maintain solubility and structural integrity of LNPs, reducing nonspecific interactions and aggregation, and enhancing separation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional SEC methods are used for LNP analysis, then separation is performed, but poor-quality separation and column fouling occur due to nonspecific interactions between LNPs and column packing material
Solution Approach 1:
Dextran is introduced as an intermediary substance in the mobile phase that mediates interactions between LNPs and column packing material. The dextran forms a protective layer around LNPs through steric stabilization, preventing direct contact and nonspecific adsorption to the column surface, thereby eliminating column fouling while maintaining effective separation.
Solution Approach 2:
The mobile phase composition is changed by adding dextran polysaccharide to conventional aqueous buffers. This parameter change modifies the chemical environment to provide steric stabilization for LNPs, reducing nonspecific interactions and improving separation quality without causing column fouling.
2Measurement precision
If conventional SEC methods are used for LNP analysis, then size separation is achieved, but poor sample recovery occurs due to LNP aggregation and precipitation
Solution Approach 1:
Dextran acts as a protective intermediary that prevents LNP aggregation and precipitation during chromatography. The polysaccharide forms a steric barrier around LNPs, maintaining their colloidal stability and preventing loss through aggregation, thereby improving sample recovery while preserving accurate size analysis.
Solution Approach 2:
Dextran is pre-added to the mobile phase before LNP injection to provide beforehand cushioning against aggregation and precipitation. This preventive measure ensures LNPs remain stable throughout the chromatographic process, avoiding sample loss that would otherwise occur during separation.
3Measurement precision
If conventional SEC methods are used for LNP analysis, then chromatographic separation is performed, but flow cell contamination occurs due to LNP adsorption
Solution Approach 1:
Dextran serves as a protective intermediary that prevents LNP adsorption to the flow cell surface. The polysaccharide forms a steric barrier around LNPs, eliminating direct contact with the flow cell walls and preventing contamination, thereby maintaining detection accuracy without adsorption losses.
4Ease of operation
If aqueous buffer alone is used as mobile phase, then simple operation is maintained, but LNP precipitation and aggregation occur reducing reproducibility
Solution Approach 1:
The mobile phase composition is modified by adding dextran polysaccharide to the aqueous buffer. This parameter change enhances LNP stability by providing steric stabilization, preventing precipitation and aggregation, thereby improving analysis reproducibility while maintaining operational simplicity through the use of a single-phase mobile phase.
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
The method provides accurate size analysis, reproducible recovery, and prevents artifacts, ensuring high reproducibility and efficiency in LNP characterization without disrupting the LNPs.
Implementation Method 1
the branched poly-α-d-glucoside is present in the mobile phase at a concentration sufficient to provide a protective layer around each LNP, reduce nonspecific interactions between LNPs and column packing material, reduce nonspecific interactions between LNPs and wetted surfaces
Implementation Method 2
The intact LNP is fully soluble in the mobile phase composition, thereby avoiding filtration effects (e.g., loss by precipitation) and providing complete and reproducible recovery of intact LNP without induction of artifacts
Implementation Method 3
performing size exclusion chromatography (SEC) on the sample
Data Source
AI summary
The present disclosure is directed to methods for characterization of a sample by size exclusion chromatography (SEC), the sample including intact lipid nanoparticles (LNPs). The method generally includes loading the sample on a chromatographic column having an SEC packing material disposed therein, flowing a mobile phase through the SEC packing material to elute the intact LNPs, and detecting the eluted intact LNPs. The mobile phase includes an aqueous buffer and a branched poly-α-d-glucoside.