Percoll

thumb|Concentration of Plasmodium falciparum-infected [[erythrocytes by discontinuous density gradient centrifugation in Percoll]]

Percoll is a reagent consisting of colloidal silica particles used in cell biology and other laboratory settings. It was first formulated by Pertoft and colleagues, and commercialized by Pharmacia Fine Chemicals. Percoll is used for the isolation of cells, organelles, or viruses by density centrifugation.