Performance Assessment of the ACQUITY UPLC H-Class PLUS Binary System

Significance of the Topic

Liquid chromatography methods must balance throughput, sensitivity, selectivity, and robustness, especially when shallow gradients are required for complex separations. Evaluating system performance under challenging gradients is essential for reliable method transfer and high-throughput workflows.

Objectives and Study Overview

This study assessed the performance of the ACQUITY UPLC H-Class PLUS Binary System equipped with the Binary Solvent Manager PLUS (BSM PLUS) and the Flow-Through-Needle Sample Manager (SM-FTN). Retention time reproducibility, method transfer from a quaternary system, and the impact of an isocratic delay were evaluated over multiple days.

Methodology and Instrumentation

• Standards: lidocaine HCl, naphazoline HCl, amitriptyline HCl, loperamide HCl, tolazamide prepared at 100 ng/mL in 50:50 methanol–water.
• Instrumentation: ACQUITY UPLC H-Class PLUS Binary System with BSM PLUS and SM-FTN; ACQUITY UPLC BEH C18 column (1.7 μm, 2.1×75 mm); Waters QDa detector in ESI positive mode.
• Chromatographic conditions: mobile phase A, 2 mM ammonium formate/0.1% formic acid; mobile phase B, acetonitrile/0.1% formic acid; flow rate 0.5 mL/min; injection 5 μL; gradient 95% A to 5% A over 1.5 min, hold to 3.0 min, return to 95% A at 3.6 min; total run time 5 min. A 300 μL isocratic hold was applied when indicated via Waters Column Calculator.
• Comparison: ACQUITY UPLC H-Class Quaternary System assessed on Day 7.

Main Results and Discussion

Retention times for all analytes were consistent to two decimal places across six injections per day over four non-consecutive days. The binary system without isocratic hold shortened retention times by 24–31% relative to the quaternary system, reflecting the reduced dwell volume. Adding the calculated isocratic hold increased retention by 6.7–10.5% due to volume compensation. Multi-day chromatograms confirmed stable peak shapes, intensities, and retention time reproducibility.

Benefits and Practical Applications

• Throughput enhancement: runtime reduced from 5 min to 3 min, a 40% decrease in analysis time.
• Robust retention time reproducibility supports method validation and routine QC.
• Simplified transfer of methods between quaternary and binary systems for cleaning validation and profiling workflows.

Future Trends and Potential Applications

Integration of low dwell-volume binary systems with automated method development tools will further optimize gradient profiles. Expanding applications in peptide mapping and metabolite profiling will leverage reduced cycle times. Coupling with high-resolution mass spectrometry may enhance sensitivity and selectivity for complex sample matrices.

Conclusion

The ACQUITY UPLC H-Class PLUS Binary System with BSM PLUS and SM-FTN delivers a robust, high-throughput platform with reliable retention time control and significant runtime reduction, facilitating efficient method transfer and optimization in analytical laboratories.

References

• Henry, C.; Wrona, M.; Kirk, J.; Ladd, R. Waters ACQUITY UPLC H-Class Coupled with an ACQUITY QDa Detector to Provide a Highly Sensitive and Specific Solution for Cleaning Validation. Waters Application Note, 720005871EN (2016).