EMPLOYING MODERN LIQUID CHROMATOGRAPHY TECHNOLOGY TO SCALE AUSP GRADIENT METHOD ON A SINGLE LIQUID CHROMATOGRAPHIC SYSTEM

Importance of the Topic

Modern pharmaceutical quality control relies on efficient, cost-effective analytical methods to ensure product safety throughout a drug’s lifecycle. Scaling traditional HPLC gradient methods to advanced liquid chromatography platforms enables significant reductions in analysis time and solvent usage while maintaining regulatory compliance and data reliability.

Objectives and Study Overview

This study aimed to transfer and scale a United States Pharmacopeia (USP) monograph gradient method for quetiapine fumarate impurity analysis from a conventional HPLC system to smaller-particle UHPLC and UPLC columns. The primary goals were to preserve chromatographic performance and quantitative reproducibility while decreasing run time and solvent consumption.

Methodology

The original monograph method used a 4.6×150 mm, 3.5 µm C8 column at 45 °C with a 70 minute gradient. Scaling employed the Waters Columns Calculator to maintain the column length-to-particle diameter (L/dp) ratio for:

• UHPLC: 3.0×100 mm, 2.5 µm column, 34 min run time
• UPLC: 2.1×75 mm, 1.7 µm column, 17 min run time

All methods used identical mobile phases (acetonitrile and ammonium acetate buffer, pH ≥9.2) and gradient profiles adjusted proportionally. Injection volumes and flow rates were recalculated to match linear velocity.

Used Instrumentation

• Waters ACQUITY Arc UHPLC System with active solvent preheating (CH-30A) and 2998 PDA detector
• XBridge BEH C8 columns for HPLC and UHPLC methods
• ACQUITY UPLC BEH C8 column for UPLC method

Main Results and Discussion

Scaling achieved substantial efficiency gains:

• UHPLC method: 51% shorter run time, 71% less solvent per sample
• UPLC method: 75% shorter run time, 89% less solvent per sample

All platforms met USP system suitability criteria for resolution of critical impurity pairs, peak tailing, and retention time reproducibility (RSD <1.3%). Quantitative impurity results for quetiapine desethoxy and an unknown impurity remained consistent across methods, confirming analytical equivalence.

Benefits and Practical Applications

• Significant time and solvent savings support higher laboratory throughput and lower operating costs.
• Maintained compliance with USP monograph requirements ensures regulatory acceptance.
• Easy method transfer using the Waters Columns Calculator simplifies implementation in pharmaceutical quality control.

Future Trends and Applications

Continued advances may include:

• Further miniaturization of column dimensions for ultra-fast analysis.
• Automated method scaling and transfer tools integrated into chromatographic software.
• Green chromatography approaches emphasizing reduced solvent consumption and waste.
• Real-time process monitoring combining scaled methods with online sampling.

Conclusion

The study demonstrates that monograph gradient methods can be successfully scaled from HPLC to UHPLC and UPLC platforms using geometric scaling principles. This approach delivers faster analyses and lower solvent usage without compromising chromatographic and quantitative performance, supporting efficient lifecycle management in pharmaceutical laboratories.

References

1. Fountain K. Transferring Compendial HPLC Methods to UPLC Technology for Routine Generic Drug Analysis. Waters Application Note 720004251en, 2012.
2. ICH Q10 Pharmaceutical Quality System. International Conference on Harmonisation, 2008.
3. Official Monographs: Quetiapine Fumarate USP 40-NF35 S1. United States Pharmacopeia and National Formulary, 2017:5939.
4. Neue UD, McCabe D, Vijaya R, Pappa H, DeMuth J. Transfer of HPLC Procedures to Suitable Columns of Reduced Dimensions. Pharmacopeial Forum, 2009;35(6):1622.
5. Waters Columns Calculator Online Help, version 2.0.