Ion exchange-high-performance liquid chromatography (IEX-HPLC)

Area of Science:

• Biochemistry
• Analytical Chemistry
• Protein Science

Background:

• Purified antibodies exhibit charge heterogeneity due to post-translational modifications and degradation.
• Accurate characterization of antibody charge profiles is crucial for quality control and therapeutic efficacy.
• Existing methods may lack the throughput or resolution required for comprehensive analysis.

Purpose of the Study:

• To describe a detailed protocol for ion exchange-high-performance liquid chromatography (IE-HPLC) for antibody charge profiling.
• To provide guidance on sample preparation, chromatographic conditions, and data analysis for reproducible results.
• To enable accurate quantification of different antibody isoforms.

Main Methods:

• High-throughput analytical method utilizing ion exchange-high-performance liquid chromatography (IE-HPLC).
• Detailed procedures for sample preparation, including buffer formulation and salt gradient optimization.
• Specific chromatographic parameters: injection volume, flow rate, run time, and column selection.
• Method for chromatogram integration to calculate isoform proportions.

Main Results:

• Established a robust IE-HPLC method for determining the charge profile of purified antibodies.
• Demonstrated the ability to resolve and quantify various antibody isoforms.
• Provided a framework for validating the analytical method for routine use.

Conclusions:

• IE-HPLC is a powerful and high-throughput technique for antibody charge variant analysis.
• The described methodology facilitates accurate assessment of antibody isoform distribution.
• This approach supports comprehensive characterization of antibody products in biopharmaceutical development.