SEC Storage Solvents with Low Buffer and Salt for Peak Resolution
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Solution Overview
Problem
Size exclusion chromatography (SEC) columns face challenges such as poor recovery of monoclonal antibody aggregates and 'hockey stick' tailing of the main monomer peak, leading to inadequate resolution and reproducibility issues, particularly in achieving sufficient start peak-to-valley ratios for quantitative results.
Innovation Solution
The use of performance-enhancing conditioning and storage solvents containing low levels of buffer and salt, specifically comprising water, a water-miscible organic solvent like methanol or acetonitrile, and phosphate and neutral salts, which are used in conjunction with porous particles having covalently attached hydrophilic surface moieties in SEC columns, helps maintain column conditioning and improves resolution over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high concentrations of protein are injected to block secondary interactions, then recovery of mAb aggregates improves, but monomer tailing and resolution issues persist
Solution Approach 1:
The patent changes the chemical parameters of the storage solvent by formulating it with specific concentrations of buffer (5-100 mM phosphate), salt (10-500 mM neutral salt), and organic modifier (1-20% water-miscible solvent). This parameter optimization resolves the contradiction by creating a solvent environment that simultaneously prevents aggregate loss and eliminates monomer tailing, achieving both high recovery and excellent resolution without requiring high protein concentration injections
2Ease of manufacture
If conventional storage solvents are used, then column storage is simple, but resolution and reproducibility deteriorate over time
Solution Approach 1:
The patent optimizes the chemical parameters of the storage solvent to maintain column performance over time. The specific formulation (5-100 mM phosphate buffer, 10-500 mM neutral salt, 1-20% organic modifier) creates a stable chemical environment that prevents degradation of column properties, ensuring reproducible SEC results throughout the column's service life without complicating the storage process
3Stability of the object's composition
If high salt and buffer concentrations are used in storage solvent, then column conditioning is maintained, but resolution between closely eluting peaks deteriorates
Solution Approach 1:
The patent identifies and resolves the contradiction by optimizing the concentration parameters of buffer and salt in the storage solvent. The formulation uses moderate concentrations (5-100 mM phosphate, 10-500 mM neutral salt) that are sufficient to maintain column conditioning stability while avoiding the excessive ionic strength that causes peak tailing and poor resolution. The organic modifier component (1-20%) further enhances this balance by reducing secondary interactions
Data Source
AI summary
This disclosure pertains to performance enhancing conditioning and storage solvents containing low levels of buffer and salt for reproducible and improved size exclusion chromatography (SEC). In some embodiments, the present disclosure pertains to storage solvents for protein-based size exclusion chromatography that include water, a water-miscible organic solvent, a phosphate salt, and a neutral salt. In some embodiments, the present disclosure pertains to columns for protein-based size exclusion chromatography that include porous particles and such a storage solvent.