Cell Fractionation Basics
Want to study what's inside a cell? You've got to get those organelles out first! Cell fractionation is basically the process of breaking cells apart and then sorting out all the different bits inside.
Before you start smashing cells, you need to prep them properly. The tissue goes into a special solution that's cold (to stop enzymes from destroying everything), has the same water potential as the tissue (so organelles don't explode or shrivel up), and is buffered (keeping the pH stable so nothing gets damaged).
Next comes homogenisation - think of it like putting cells in a blender called a homogeniser. This releases all the organelles from their cellular prisons. The resulting mixture (called homogenate) gets filtered to remove any leftover cell debris and chunks.
Key Point: The three conditions (cold, isotonic, buffered) are absolutely crucial - mess these up and your organelles will be ruined before you even start!
Finally, centrifugation separates the organelles based on their properties. There are two main types: ultracentrifugation (sorts by weight) and density gradient centrifugation (sorts by density). Once separated, scientists can study each organelle individually.
