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  1. Pellet 1.5 ml of an overnight culture at 12,000 rpm in Eppendorf centrifuge at RT for 3 min.
  2. Resuspend bacterial pellet in 350 l of STET buffer.
  3. Add 25 l of freshly prepared solution of lysozyme (10 mg/ml in 10 mM Tris-Cl, pH 8).
         Mix by vortexing for 3 sec.
  4. Place the tube in a boiling water bath for exactly 40 sec.
  5. Centrifuge the lysate at 12,000 g for 10 min at room temp.
  6. Remove the glob of bacterial debris with a sterile toothpick.
  7. Add to the supernatant 40 l of 2.5 M NaOAc (pH 5.2) and 420 l of isopropanol.
         Mix by vortexing and store the tube for 5 min at room temp.
  8. Centrifuge at 12,000 g for 5 min at 4C.
  9. Remove the supernatant and wash with 1 ml 70% ethanol.
  10. Dry the pellet and resuspend in TE (pH 8) with RNase A (20 g/ml).

STET buffer:
0.1 M NaCl
10 mM Tris-Cl, pH 8.0
1 mM EDTA, pH 8.0
5% Triton X-100