Add 300 µl Buffer AL, close the lid, and mix by pulse-vortexing for 10 s.
To ensure efficient lysis, it is essential that the sample and Buffer AL are thoroughly
mixed to yield a homogeneous solution.
A white precipitate may form when Buffer AL is added to Buffer ATL. The precipitate
does not interfere with the QIAamp procedure and will dissolve during incubation
in step 6.
Note: If carrier RNA is required (see page 10), add 1 µg dissolved carrier RNA
to 300 µl Buffer AL. Note that carrier RNA does not dissolve in Buffer AL. It must
first be dissolved in Buffer ATE and then added to Buffer AL.
6. Place the tube in the thermomixer or heated orbital incubator, and incubate at 70°C
with shaking at 900 rpm for 10 min.
If using a heating block or water bath, vortex the tube for 10 s every 3 min to
improve lysis.
7. Briefly centrifuge the 1.5 ml tube to remove drops from the inside of the lid.
If solid particles are still visible, centrifuge at 6000 x g (8000 rpm) for 1 min, and
carefully transfer supernatant to a new 1.5 ml microcentrifuge tube (not provided).
8. Add 150 µl ethanol (96–100%), close the lid, and mix thoroughly by pulsevortexing
for 15 s.
To ensure efficient binding in step 10, it is essential that the sample and ethanol
are thoroughly mixed to yield a homogeneous solution.
9. Briefly centrifuge the 1.5 ml tube to remove drops from the inside of the lid.
10. Carefully transfer the supernatant from step 9 to the QIAamp MinElute column (in
a 2 ml collection tube) without wetting the rim.
11. Close the lid, and centrifuge at 6000 x g (8000 rpm) for 1 min. Place the QIAamp
MinElute column in a clean 2 ml collection tube, and discard the collection tube
containing the flow-through.
If the lysate has not completely passed through the membrane after centrifugation,
centrifuge again at a higher speed until the QIAamp MinElute column is empty.
12. Carefully open the QIAamp MinElute column and add 500 µl Buffer AW1 without
wetting the rim. Close the lid and centrifuge at 6000 x g (8000 rpm) for 1 min.
Place the QIAamp MinElute Column in a clean 2 ml collection tube, and discard the
collection tube containing the flow-through.