Column robustness case study for a liquid chromatographic method validated in compliance with ICH, VICH, and GMP...

Area of Science:

• Analytical Chemistry
• Pharmaceutical Analysis
• Method Development and Validation

Background:

• Method validation is critical for pharmaceutical submissions, adhering to guidelines like ICH and GMP.
• Robustness investigations are essential to ensure method reliability across different conditions.
• Inconsistent retention times (RTs) for an impurity peak were observed during validation of a liquid chromatography (LC) method.

Purpose of the Study:

• To investigate and resolve robustness issues encountered during the validation of an LC method for a triazinetrione anticoccidial product.
• To identify the root cause of inconsistent impurity peak retention times.
• To ensure the method meets established robustness criteria for pharmaceutical analysis.

Main Methods:

• Development of a liquid chromatographic method for analyzing active pharmaceutical ingredients (API), impurities, and preservatives.
• Systematic investigation of retention time variations using different analytical columns from the same supplier.
• Implementation of mobile phase modifications (addition of tetrabutylammonium hydroxide) to assess impact on peak resolution and RT consistency.
• Further investigation to identify the stationary phase as a potential source of inhomogeneity.

Main Results:

• An impurity peak exhibited inconsistent RTs, failing robustness criteria when using columns from the same supplier but different lots.
• Adding tetrabutylammonium hydroxide to the mobile phase temporarily resolved RT variation, allowing continued submission work.
• Inhomogeneity of active sites on the column's stationary phase was identified as the probable cause of the robustness issue.
• A new, more suitable column was identified, and a column qualification study was initiated.

Conclusions:

• Method robustness is crucial for reliable pharmaceutical analysis and regulatory compliance.
• Column stationary phase inhomogeneity can significantly impact method performance and lead to validation failures.
• Systematic investigation and temporary adjustments can facilitate ongoing regulatory submissions while root cause analysis is performed.
• Selection of appropriate chromatographic columns is vital for ensuring method robustness and reproducibility.