Rapid analytical tryptic mapping of a recombinant chimeric monoclonal antibody and method validation challenges

Area of Science:

• Analytical Chemistry
• Biopharmaceutical Analysis

Background:

• Lot release testing of recombinant chimeric monoclonal antibodies requires robust identity tests.
• Conventional tryptic mapping methods are time-consuming, often spanning several days.

Purpose of the Study:

• To develop a rapid and reproducible analytical tryptic mapping method for monoclonal antibody identity testing.
• To optimize the method for efficient lot release testing in biopharmaceutical manufacturing.

Main Methods:

• Optimization of protein unfolding, reduction, carboxymethylation, and trypsin digestion.
• Utilized reversed-phase high-performance liquid chromatography (RP-HPLC) for analysis.
• Validated method parameters including precision, recovery, specificity, and robustness.

Main Results:

• Achieved a total analysis time of less than 8 hours, significantly faster than conventional methods.
• Demonstrated high precision (RSD < or = 10%) and good recovery (mean 88.4%) for marker peaks.
• Confirmed specificity through unique tryptic maps and robustness against minor parameter changes; resolved autosampler vial adsorption issues.

Conclusions:

• The developed rapid tryptic mapping method is a reproducible and efficient identity test for lot release.
• The method shows potential applicability to a broad spectrum of pharmaceutically relevant monoclonal antibodies.
• Optimization, including the use of polypropylene vials, enhances method reliability.