1. Used to separate particles suspended in solution
①Separate the formed components in the blood, and concentrate the cells or other constituents in the body fluid for analysis and measurement.
② Isolation of ligands and free ligands that binds to proteins or an antibodies.
③ Separation of proteins that have been precipitated in the specimen.
2. Separation of two liquids of mutually different density
①For example, organic solvent is used to extract certain components of the body fluid.
② Separation of lipid components in the blood, such as separation of chylomicrons and various lipoproteins in plasma.