Water Proton NMR: A Tool for Protein Aggregation Characterization.

Area of Science:

• Biopharmaceutical Formulation
• Protein Aggregation Analysis
• Analytical Chemistry

Background:

• Protein aggregation is a critical challenge in biopharmaceutical formulation stability.
• Conventional analytical techniques for protein aggregate characterization have limitations, including sample manipulation requirements.
• Developing sensitive and efficient methods for aggregate detection is crucial for drug development.

Purpose of the Study:

• To compare the sensitivity of water NMR (wNMR) with conventional methods for detecting protein aggregates.
• To evaluate wNMR's performance in identifying monoclonal antibody aggregates induced by various stress conditions.
• To assess wNMR's potential for optimizing protein formulations.

Main Methods:

• Comparison of size-exclusion chromatography (SEC), microflow imaging (MFI), and dynamic light scattering (DLS) with water NMR (wNMR).
• Analysis of monoclonal antibody aggregates generated under different stress conditions.
• Measurement of water proton transverse relaxation rate R₂(¹H₂O) using wNMR.

Main Results:

• wNMR demonstrated superior sensitivity to both soluble and insoluble protein aggregates compared to SEC, MFI, and DLS.
• wNMR effectively detected subvisible protein particles.
• The technique showed consistent sensitivity across different types of aggregates induced by various stresses.

Conclusions:

• Water NMR (wNMR) is a highly sensitive and consistent method for detecting protein aggregates.
• wNMR offers advantages of simplicity, noninvasive measurement, and high throughput potential.
• This technique can significantly enhance the efficiency of protein formulation optimization.