Analytical Scale 96-well Protein A Affinity Resin-Based Purification using Andrew+ Automation Robot

Significance of the Topic

Purification of monoclonal antibodies (mAbs) is central to biotherapeutic development, quality control, and process optimization. High-throughput Protein A affinity capture enhances experimental efficiency by reducing manual handling and accelerating data generation. Automation platforms enable consistent, scalable sample processing critical for design-of-experiment studies and rapid critical quality attribute analysis.

Objectives and Study Overview

This study aimed to integrate an automated 96-well Protein A purification protocol on an Andrew+ Robot to capture mAbs from harvested cell culture fluid (HCCF). Core objectives included:

• Developing a dynamic workflow accommodating 1–96 samples in a single run.
• Evaluating recovery yield, reproducibility, and throughput using LC-UV analysis with Waters BioResolve Protein A Affinity Column.
• Deploying the protocol through OneLab for broad accessibility.

Methodology and Instrumentation

HCCF samples from a 14-day CHO cell culture were clarified and loaded (120 µL per well) onto a filter plate containing immobilized Protein A resin. The Andrew+ Robot executed resin washing, antibody binding, glycine elution, and neutralization steps. Eluates (100 µL) were analyzed by LC-UV in triplicate with NISTmAb standards.

Instrumentation

• Andrew+ Automation Robot with 8-channel pipetting deck
• Waters ACQUITY Premier BSM LC-UV system
• Waters BioResolve Protein A Affinity Column, MaxPeak Premier (2.1 × 20 mm)
• waters_connect Software and OneLab control platform

Main Results and Discussion

The automated workflow yielded an average recovery of 96.8 ± 8.2% across 96 wells, with inter-well RSD of 8.5%. LC-UV calibration (0.05–5 mg/mL; R2 = 0.998) produced sharp peaks and peak area RSD < 1% for triplicate injections. The protocol maintained performance regardless of sample batch size and minimized carryover through gradient washing.

Benefits and Practical Applications

• High-throughput purification supports rapid DoE and process optimization.
• Enhanced reproducibility and reduced manual variance.
• Small sample volumes and efficient consumable use.
• Seamless integration into upstream and downstream analytics workflows.

Future Trends and Potential Applications

Future developments may involve coupling automated purification with mass spectrometry for multi-attribute analysis, on-line buffer exchange modules, and microfluidic scaling. Integration with AI-driven analytics could facilitate real-time process monitoring and adaptive control in biomanufacturing.

Conclusion

The Andrew+ Robot-based 96-well Protein A affinity protocol enables rapid, reproducible mAb purification with high recovery and precise LC-UV quantitation. Its dynamic design and OneLab availability empower streamlined workflows for research and industrial bioprocessing.

Reference

• Alelyunas YW, Wushensky J, Wrona M, Chen R, Padliya ND. Analytical Scale 96-well Protein A Affinity Resin-Based Purification using Andrew+ Automation Robot Supporting Upstream Bioprocessing. Waters Application Note; 720009002.
• Koza SM, Hanna CM, Jiang AHW, Yu YQ. Automated High-Throughput Analytical-Scale Monoclonal Antibody Purification Using Production-Scale Protein A Affinity Chromatography Resin. Waters Application Note; 720007861.
• Koza SM, Shiner S, Lauber MA. Lowering Quantitation Limits for mAb Titer Measurements Using Small Volume 3.5 µm Particle-Size Protein-A Affinity Columns. Waters Application Note; 720008775.