Hydrophobic Interaction Chromatography Method Optimization

This application note serves as a guide for optimizing hydrophobic interaction chromatography (HIC) methods using the TSKgel HIC-ADC Butyl column. It details the influence of various mobile phase modifications, including pH, organic solvent concentration, salt concentration, and gradient mixing rates, on the separation efficacy of monoclonal antibodies (mAbs) and antibody-drug conjugates (ADCs). The document outlines experimental conditions, including specific gradient elutions and flow rates, and presents findings on how these modifications affect elution profiles and separation resolution. For instance, it discusses how varying the salt concentration impacts retention times and separation efficiency, as well as how pH adjustments can alter the charge distribution of proteins, thereby affecting their separation. Additionally, the note explains the role of organic solvents in enhancing elution of high DAR variants, demonstrating the importance of fine-tuning mobile phase conditions for effective HIC separations. Overall, a comprehensive understanding of these factors is essential for optimizing HIC methods.