Team:Calgary/Notebook/Protocols/Process8

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Nuclear DNA extraction from Algae

Total DNA isolation protocol



Extraction buffer (for 40 ml total):
1 M Tris HCl pH 7.5 8 ml
5 M NaCl 2 ml
0.5 M EDTA 2 ml
20% SDS 1 ml
ddH2O 27 ml


  1. Place 1.5 ml of algae culture into centrifuge tube.
  2. Spin down cells at 5000 rpm for 1 minute.
  3. Pipette off supernatant.
  4. Add 400 µl extraction buffer.
  5. Incubate for 15 minutes at 50ºC, inverting tubes several times during incubation.
  6. Centrifuge at 13000 rpm for 5 minutes.
  7. Transfer supernatant to new tube.
  8. Add 400 µl isopropanol.
  9. Invert several times.
  10. Place on ice for 5 minutes.
  11. Centrifuge at 13000 rpm for 10 minutes.
  12. Pour off supernatant and wash pellet with 500 µL of 70% ethanol, ensuring to resuspend the pellet.
  13. Centrifuge at 13000 rpm for 1 minutes.
  14. Decant ethanol and place tubes upside down on paper towel to dry off excess ethanol.
  15. Dissolve pellet in 50 µl elution buffer, place tube on bench for 4 hours.
  16. Centrifuge at 13000 rpm for 2 minutes.
  17. Discard the supernatant, DNA is in the pellet.

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