Percoll and Ficoll self-generated density gradients by low-speed osmocentrifugation.

Percoll and Ficoll self-generated density gradients can be obtained by low-speed centrifugation of their solutions within dialysis cells. Useful Percoll density gradients can be obtained after 10-30 min centrifugation at 220-2010g, within dialysis cells. Ficoll density gradients, which are more difficult to self-generate, can be obtained by the same technique. Red cell band formation in a Percoll density gradient can be done in a single step by using dialysis cells as the centrifugation solution container.