Ultracentrifugation

Ultracentrifugation designates a high-speed centrifugation technique using extremely high centrifugal forces, often exceeding 100,000 times gravity, to separate particles, macromolecules, organelles, or viral components based on size, density, and sedimentation behaviour. This method enables fractionation of complex biological mixtures into defined layers, allowing isolation of specific components with high resolution. Ultracentrifugation may be performed as differential ultracentrifugation or as density gradient ultracentrifugation using sucrose or cesium chloride gradients.

The biopharmaceutical industry employs ultracentrifugation in research, process development, and analytical characterisation. Viral vector manufacturing uses ultracentrifugation for purification and concentration, particularly in early-stage development. Density gradients support separation of full versus empty capsids for adeno-associated virus, improving product quality assessment. Analytical ultracentrifugation provides quantitative measurement of protein aggregation, oligomeric state, and molecular weight distribution without requiring immobilisation or labelling. Process development teams evaluate ultracentrifugation as a purification option, though scalability limitations restrict routine commercial use compared to chromatography and filtration. As advanced therapies expand and high-resolution analytical methods remain essential for complex biologics, ultracentrifugation continues providing valuable separation and characterisation capabilities supporting development and quality understanding.