Affinity Chromatography

Affinity Chromatography designates a highly selective purification technique exploiting specific biological interactions between target molecules and immobilised ligands, achieving exceptional selectivity in single-step operations. Ligand-target pairs include antibody-antigen, enzyme-substrate, or receptor-ligand interactions providing high specificity compared to non-selective separation methods.

The biopharmaceutical industry relies on affinity chromatography as a cornerstone downstream purification step, particularly Protein A chromatography for monoclonal antibody capture achieving high purity and yield in single operations. Immobilised metal affinity chromatography purifies His-tagged recombinant proteins efficiently. Lectin affinity chromatography exploits glycan-specific binding for glycoprotein isolation. Process development optimises loading conditions, wash strategies, and elution buffers maximising yield while maintaining product quality. As novel biologic modalities expand purification challenges, affinity chromatography continues evolving through engineered ligands and innovative process designs.