Predicting Colloidal Stability of High-Concentration Monoclonal Antibody Formulations in Common Pharmaceutical Buffers Using Improved Polyethylene Glycol Induced Protein Precipitation Assay

作者：Noemi P. Meza, Colin A. Hardy, Kylie H. Morin, Chengbin Huang, Smita Raghava, Jing Song, Jingtao Zhang, Ying Wang · 发表于：Molecular Pharmaceutics · 年份：2023 · DOI：10.1021/acs.molpharmaceut.3c00694 · 被引用次数：10 · 研究领域：Protein purification and stability、Monoclonal and Polyclonal Antibodies Research、Microfluidic and Capillary Electrophoresis Applications

Colloidal stability is an important consideration when developing high concentration mAb formulations. PEG-induced protein precipitation is a commonly used assay to assess the colloidal stability of protein solutions. However, the practical usefulness and the current theoretical model for this assay have yet to be verified over a large formulation space across multiple mAbs and mAb-based modalities. In the present study, we used PEG-induced protein precipitation assays to evaluate colloidal stability of 3 mAbs in 24 common formulation buffers at 20 and 5 °C. These prediction assays were conducted at low protein concentration (1 mg/mL). We also directly characterized high concentration (100 mg/mL) formulations for cold-induced phase separation, turbidity, and concentratibility by ultrafiltration. This systematic study allowed analysis of the correlation between the results of low concentration assays and the high concentration attributes. The key findings of this study include the following: (1) verification of the usefulness of three different parameters ( C mid, μ B, and T cloud ) from PEG-induced protein precipitation assays for ranking colloidal stability of high concentration mAb formulations; (2) a new method to implement PEG-induced protein precipitation assay suitable for high throughput screening with low sample consumption; (3) improvement in the theoretical model for calculating robust thermodynamic parameters of colloidal stability (μ B and ε B ) that are independe...