- Acetone Powder Prep by Schleicher et al. (adapted from thesis
of Ludwig Eichinger)
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-
- Prepare one day ahead:
- 2 L 0.5M KCl; 0.1M K2HPO4 (74.5g KCl, 45.6g K2HPO4.3H2O)
- 10 L distilled water
- 1M Na2CO3
- 5 L cold acetone
- meat grinder, reserve large centrifuge
- keep everything in cold room
- For 300g of muscle:
- 1. grind two times.
- 2. extract(dissolve in the solution and stir) for 10 min in 900-ml KCl,
K2HPO4
- 3. spin @ 4000xg for 10min, weigh the pellets.
- 4. extract pellets again in KCl;K2HPO4
- 5. Spin @ 4000xg for 10min., weigh the pellets.
- 6. Add cold water and re-suspend the pellets.
- 7. Raise pH to 8.2-8.5 with 1M Na2CO3
- 8. Spin @ 4000xg for 10min.
- 9. Decant the supernatant and weigh pellet.
- 10. Re-suspend pellet in water again, check pH to keep it ~ 8.2.
- 11. Repeat the water extraction until the pellet weight start to increase.
- NOTE: The weight of the pellet will go down the first 2 spins or so, and
then will begin to rise.
- 12. After the last water extraction, pool the pellets into one 4L glass
beaker and add 4 L cold acetone.
- 13. Quickly re-suspend and immediately filter through cheesecloth when precipitate
starts to form.
- 14. Repeat once more with acetone.
- 15. Dry the acetone powder overnight in the hood on filter paper.
- To get rid of the lipids in the acetone powder, extract dried powder
with chloroform by filtering the chloroform-acetone powder mix through a Büchner
funnel sitting over an Erlenmeyer flask. Dry in hood again.