Monitoring protein aggregation kinetics with simultaneous multiple sample light scattering

Area of Science:

• Biopharmaceutical analysis
• Protein aggregation studies
• Light scattering techniques

Background:

• Monoclonal antibodies (mAbs) are crucial biopharmaceuticals.
• Monitoring mAb aggregation is vital for drug safety and efficacy.
• Existing methods for aggregation analysis can be time-consuming and limited in throughput.

Purpose of the Study:

• To develop and validate a Simultaneous Multiple Sample Light Scattering (SMSLS) instrument.
• To monitor time-dependent aggregation behavior of mAbs.
• To characterize molecular properties like molecular mass and virial coefficients.

Main Methods:

• Utilized a novel SMSLS prototype instrument.
• Simultaneously measured light scattering from multiple independent mAb solutions.
• Analyzed aggregation rates, activation energies, and virial coefficients across various temperatures and concentrations.

Main Results:

• SMSLS instrument successfully monitored aggregation kinetics and molecular properties.
• Identified distinct aggregation regimes (Arrhenius and Stochastic) with temperature-dependent breakpoints.
• Demonstrated high sensitivity, detecting early-stage dimerization events and revealing relationships between virial coefficients and aggregation.
• Observed linear early-phase aggregation transitioning to chaotic later phases.

Conclusions:

• SMSLS offers a high-throughput, continuous monitoring solution for mAb stability.
• The instrument provides valuable insights into aggregation mechanisms and protein behavior.
• SMSLS can significantly enhance biopharmaceutical development and quality control processes.