1) Homogenisation - breaking up the cells. e.g. by vibrating the cells by grinding the cellsup in a blender. Thsi breaks up the plasma membrane and releases the organelle into the solution.
2) Filtration- gettng rid of the big bits. The solution is filtered though a gauze to seperate any large cell debris or tissue debris. The organelles are much smaller than the debris, so they pass through.
3) Ultracentrifugation - Seperating the organelles.
- The cell fragments are poured into a tube. This tube is put into a cetrifuge and spun at a low speed. the heaviest organelles, like nuclei, get flung to the bottom - the pellet. The rest of the organelles stay suspended in the fluid above the sediment - the supernatant.
- The supernatant is drained off, poured into another tube, and spun in a centrifuge at a higher speed.
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