Avoid Potential Downtime Due to Column Availability: Moving an LC Method to an Alternative Stationary Phase

Significance of the Topic

Delays in chromatographic testing due to column shortages can halt quality control workflows and impact product release.
Transferring an LC method to an alternative stationary phase ensures timely analysis and reduces downtime risk.

Objectives and Study Overview

This study demonstrates the process of migrating a forced degradation assay for the drug pomalidomide from an Inertsil ODS-SP column to a Waters XSelect HSS T3 column.
It highlights the selection of comparable chemistry, method transfer tools, and evaluation of chromatographic performance.

Methodology and Instrumentation

Forced degradation was induced by acid hydrolysis using 1 M HCl at 90 °C for 30 minutes, followed by neutralization with NaOH and dilution in acetonitrile/formic acid for analysis.

Used Instrumentation

• LC system: Waters Alliance e2695 with 2489 UV/Vis detector
• Software: Empower 3 Feature Release 4
• Columns: Inertsil ODS-SP and XSelect HSS T3 (4.6 × 250 mm, 5 μm)
• Mobile phases: 0.1% formic acid in water:acetonitrile (90:10) and acetonitrile
• Column temperature: 30 °C; Sample temperature: 10 °C; Flow rate: 1.0 mL/min; Detection at 240 nm

Main Results and Discussion

• Stationary phase selection was guided by matching particle type, carbon load, and surface area characteristics.
• XSelect HSS T3 exhibited slightly lower retention but comparable plate counts and peak widths to the Inertsil ODS-SP column.
• Resolution of critical peak pairs differed by –30% for one pair and +26% for another on the XSelect HSS T3 compared to the original column.

Overall separation performance remained similar, confirming that minimal method adjustments are required when phases are well matched.

Benefits and Practical Applications

• Maintains continuity of critical quality control and forced degradation assays under supply chain constraints.
• Reduces extensive revalidation by selecting phases with comparable chromatography.
• Utilizes digital tools like Waters Column Coach to streamline stationary phase selection across vendors.

Future Trends and Applications

• Broader adoption of software platforms for in silico comparison of column chemistries.
• Predictive modeling for automated method transfer and real-time optimization.
• Development of multi-modal stationary phases offering enhanced selectivity ranges.

Conclusion

A successful transfer of the pomalidomide forced degradation method from Inertsil ODS-SP to XSelect HSS T3 demonstrates that with informed phase selection and digital support tools, laboratories can effectively mitigate downtime caused by column availability issues.

References

1. Lu P, Wang L, Song M, Hang TJ. Identification and Characterization of Related Substances in Pomalidomide by Hyphenated LC-MS Techniques. Journal of Pharmaceutical and Biomedical Analysis. 2015;159–167.
2. USP L Column Listing. Waters Corporation. 2021.
3. Waters Column Coach Webpage. Waters Corporation. 2021.
4. HPLC Columns Compare Tool. HPLCColumns.org. 2021.