ACQUITY UPLC SYSTEM CONSIDERATIONS FOR SIZE-EXCLUSION CHROMATOGRAPHY (SEC)

Importance of the Topic

Size exclusion chromatography on UPLC platforms provides high resolution separation of macromolecules while minimizing sample dispersion. This makes it essential for quality control and research applications involving proteins, polymers and biopharmaceuticals.

Study Objectives and Overview

This whitepaper evaluates best practices for performing SEC on four ACQUITY UPLC configurations. It compares solvent delivery, sample management and flow cell considerations to optimize performance and reproducibility.

Methodology and Instrumentation

Key protocol elements include increasing seal wash rates tenfold, avoiding nonvolatile buffers above 500 millimolar in needle wash solvents, reducing syringe draw rates for viscous samples and using predominantly aqueous seal washes. Flow cell selection focuses on titanium or stainless steel cells to prevent peak tailing under aqueous conditions.

Used Instrumentation

• ACQUITY UPLC System with Binary Solvent Manager and sample manager for routine SEC using non-salt eluents and enhanced seal wash routines.
• ACQUITY UPLC H-Class System featuring quaternary blending and direct-inject autosampling for multimode solvent gradients and routine maintenance guidelines.
• ACQUITY UPLC H-Class Bio System with bioinert flow path materials designed for high ionic strength buffers and rigorous biopharmaceutical separations.
• ACQUITY UPLC I-Class System combining a binary pump and versatile sample manager with fixed-loop or flow-through needle options, offering minimal dispersion for demanding LC-MS applications.

Results and Discussion

All systems achieve low dispersion volumes of 10 to 15 microliters. Recommended flow cells include titanium or stainless steel UV cells at 1.5 microliter volume and refractive index cells at 1.3 microliter volume. Aqueous organic mixtures at 90 percent aqueous for seal washes ensure stable performance.

Benefits and Practical Applications

Optimized SEC on UPLC platforms delivers rapid, high fidelity molecular weight distributions with low carryover. The flexible solvent blending and bioinert materials expand applicability in biopharmaceutical development, industrial QC and academic research.

Future Trends and Opportunities

Emerging directions include inline buffer exchange modules, advanced bioinert coatings to extend column life, software driven gradient optimization and next generation detectors that further reduce system dispersion and enhance sensitivity.

Conclusion

Adhering to tailored maintenance and setup protocols across ACQUITY UPLC configurations ensures reliable SEC performance. Proper solvent management, flow cell selection and optimized sample handling enable reproducible, high resolution separations across diverse applications.