Application Note High Utilization and Robustness of the Alliance™ iS HPLC System Using the Analysis of a USP Impurity Method

Importance of the Topic

Robust and dependable HPLC systems are essential in regulated laboratories to sustain high instrument usage (>75%) and meet stringent product release timelines. Minimizing downtime while ensuring data accuracy reduces reruns and maximizes productivity.

Objectives and Overview

This study evaluated the Alliance iS HPLC System over forty consecutive days using the USP Fluconazole Organic Impurities method. Daily assessments of system suitability and sample impurity levels were performed to demonstrate long-term robustness and consistency.

Methodology and Instrumentation

Sample and system suitability solutions were prepared according to the USP monograph, containing Fluconazole and related impurity standards in 80:20 water:acetonitrile at specified concentrations. Key instrument and method parameters included:

• HPLC system: Waters Alliance iS with TUV detector
• Software: Empower 3.8.0.1
• Column: XSelect HSS T3 3.5 µm, 4.6 × 150 mm, 40 °C
• Mobile phase: isocratic 80% water/20% acetonitrile, flow rate 0.5 mL/min
• Injection volume: 20 µL; run time: 20 min; detection at 260 nm
• Sample temperature: 10 °C

Main Results and Discussion

System suitability criteria (resolution ≥1.5, %RSD Area and %RSD Retention Time ≤5.0%) were met every day for all four compounds. Control charts for resolution and RSD values showed all points within ±3σ of the mean, confirming sustained performance.
The Fluconazole sample containing two impurities was quantified daily. The mean impurity levels remained stable: Related Compound A at 0.002% and an unknown impurity at 0.374%, with control charts indicating a state of control over 40 days.

Benefits and Practical Applications

Key advantages of the Alliance iS HPLC System include:

• Extended continuous operation with high utilization (>75% uptime)
• Consistent system suitability performance, minimizing reruns and avoiding delays
• Reliable quantitative impurity analysis for confident product release in QC environments

Future Trends and Opportunities

Integration of real-time diagnostic checks, advanced data analytics, and predictive maintenance will further enhance HPLC uptime and method robustness. Connectivity with laboratory information management systems (LIMS) and AI-driven monitoring can optimize workflows and support regulatory compliance.

Conclusion

The Alliance iS HPLC System demonstrated high utilization, reproducible system suitability, and stable impurity quantitation over a forty-day study using the USP Fluconazole Organic Impurities method. Its modern interface and built-in checks support QC laboratories in delivering reliable results with minimal downtime.

References

1. United States Pharmacopeia. Fluconazole Monograph, USP 43-NF38, 2020.
2. Waters Corporation. Alliance iS HPLC System, 2024.
3. Zhang X., Birdsall R., You Y. Enhancing Robustness for Biopharmaceutical Separations Using the Waters ACQUITY UPLC PLUS Series. Waters Application Note, 2018.
4. Francis D. Driving Efficiency in QC Labs. Waters White Paper, 2023.