Multiproduct high-resolution monoclonal antibody charge variant separations by pH gradient ion-exchange...

Area of Science:

• Biochemistry
• Analytical Chemistry
• Biotechnology

Background:

• Ion-exchange chromatography is crucial for protein charge heterogeneity profiling in biotechnology.
• Traditional ionic strength-based methods are robust but product-specific and require extensive development.
• Monoclonal antibodies (mAbs) require precise characterization of charge variants.

Purpose of the Study:

• To develop a multiproduct, pH gradient-based ion-exchange separation method for monoclonal antibodies.
• To demonstrate the method's ability to separate closely related antibody species efficiently.
• To establish a robust and high-throughput analytical technique for biopharmaceutical development.

Main Methods:

• Utilized a cation exchange column with pH gradients generated by simple buffer mixtures.
• Controlled and optimized pH gradient profiles using pump settings and buffer composition.
• Parallel optimization of buffer compositions for multiple monoclonal antibodies.
• Investigated operational parameters including column chemistry, length, and sample matrix compatibility.

Main Results:

• The pH gradient method successfully separated closely related monoclonal antibody species.
• The multiproduct approach proved optimal across all tested mAbs.
• The separation demonstrated high resolving power and peak capacity, exceeding traditional methods.
• The method showed robustness and insensitivity to column length.
• Direct analysis of in-process manufacturing samples without buffer exchange was achieved.

Conclusions:

• pH gradient ion-exchange chromatography is a versatile and efficient multiproduct method for mAb charge heterogeneity analysis.
• This approach significantly reduces development time compared to ionic strength-based methods.
• The method's robustness and direct analysis capability are highly valuable for high-throughput bioprocess monitoring and product release.