In this method, the crude protoplasts suspension is centrifuged at low speed (50-100g for 5 min).
The intact protoplasts form a pellet and supernatant containing cell debris can be pipetted off.
The pellet is gently resuspended in fresh culture media plus mannitol and rewashed.
This process is repeated two or three times to get relatively clean protoplast preparation.
Protoplasts can be purified by repeated gentle pelleting and resuspension