Notes on the protocol: This protocol does not specify a particular buffer - you may choose which is most appropriate for your downstream application (nucleic acid isolation, protein extraction, etc.).
One of these Bullet Blenders
Bullet Blender 50-DX (BB50-DX)
Bullet Blender 50 Gold (BB50-AU)
2 x volume of sample
0.5 mm zirconium oxide beads (ZROB05) Use a volume of beads equivalent to 1 x the volume of the sample
If your sample has been grown on a plate or other solid surface, detach it (e.g, by flooding the plate with PBS and scraping) and place the material in a microcentrifuge tube. Liquid cultures may be placed directly in the tube as long as they are of sufficient density.
Centrifuge the suspension to yield a pellet. The pellet should be no larger than 300 ul.
Pipette off the supernatant, and resuspend the pellet in 2 volumes of homogenization buffer.
Place the sample in the tube with the beads.
Close the tubes tightly and place them in the Bullet Blender.
Set the controls for Speed 10 and Time 12. Press Start.
After the run, remove the tubes from the instrument and visually inspect the samples. If homogenization is incomplete, repeat the homogenization step at a higher speed.