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Protein quantitation using various modes of high performance liquid chromatography
Sandra Grotefend1, Lukas Kaminski, Stefanie Wroblewitz
1Technische Universität Braunschweig, Institute of Medicinal and Pharmaceutical Chemistry, Beethovenstr. 55, 38106 Braunschweig, Germany.
Journal of Pharmaceutical and Biomedical Analysis
|September 18, 2012
Summary
Accurate protein quantification is crucial for biologic drugs like monoclonal antibodies (mAbs). This study compares HPLC methods, finding high-performance size exclusion chromatography (HP-SEC) and reversed-phase chromatography offer superior precision and selectivity for quality control.
Area of Science:
- Biochemistry
- Analytical Chemistry
- Pharmaceutical Science
Background:
- Biologics, including monoclonal antibodies (mAbs), are increasingly vital in treating cancer and autoimmune diseases.
- Accurate protein quantification and aggregate detection are essential for ensuring the safety and efficacy of these potent drugs.
- Traditional methods like Bradford assay and SDS-PAGE lack the necessary precision and selectivity for quality control (QC).
Purpose of the Study:
- To compare various High-Performance Liquid Chromatography (HPLC) separation modes for enhanced protein analysis.
- To evaluate the precision, selectivity, and quantitation limits of different HPLC techniques for protein quantitation.
- To assess the suitability of these methods for quality control of biologic drugs, including an IgG1 antibody.
Main Methods:
- Comparison of four HPLC separation modes: High-Performance Size Exclusion Chromatography (HP-SEC), Strong Anion Exchange (SAX), Weak Cation Exchange (WCX), and Reversed-Phase (RP) chromatography.
- Evaluation of method precision (RSD% <5%), selectivity, and quantitation limits (<15μg/ml) using model proteins (ovalbumin, myoglobin, BSA, cytochrome c, lysozyme).
- Comparative analysis against electrophoretic techniques, considering analysis time, sample preparation, and separating capacity, including analysis of an IgG1 antibody.
Main Results:
- All tested HPLC modes demonstrated good precision (RSD% <5%) and low quantitation limits (<15μg/ml) for model proteins.
- HP-SEC and RP chromatography exhibited excellent precision (<1.9% and <2%, respectively).
- The study successfully analyzed an IgG1-type antibody, showcasing the applicability of these HPLC methods for complex biologics.
Conclusions:
- HPLC separation modes offer significant improvements in precision and selectivity over traditional methods for protein quantitation.
- HP-SEC and RP chromatography are particularly promising for robust quality control of biologic drugs.
- These advanced analytical techniques are essential for ensuring the safety and efficacy of protein-based therapeutics.
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