This procedure allows the concentration of DNA samples from dilute solution and the removal of unwanted salts from DNA samples. Materials 3M Sodium Acetate buffer, pH 5.2 (store at 4 ℃). Cold 100% Ethanol (-20℃). Cold 70% Ethanol in sterile dH2O (-20℃). DNA sample 4 ℃ Microcentrifuge (normal microcentrifuge in cold room works fine). All centrifugations should be on "soft" (no brake) setting. Procedure 1.Transfer DNA to a container where it fills one fourth the total volume (a 500 µL tube should have no more than 125 µL of DNA solution, for example) . 2.Add one tenth volum of Sodium Acetate buffer to equalize ion concentrations. 3.Add at least two volumes of cold 100% ethanol; let stand in -20℃ freezer for at least one hour. 4.Centrifuge sample for 15 minutes at highest speed in a 4℃ microcentrifuge. 5.Remove as much supernatant as possible with a 1 mL micropipet; recentrifuge, then remove the rest with a 200 µL pipet. 6.Add 200 µL of cold 70% ethanol; centrifuge for 5 minutes in a 4 ℃ centrifuge. 7.Remove supernatant with a 200 µL pipet; evaporate remaining ethanol in a 37 ℃ water bath. 8.Resuspend pellet in desired volume of water or TE buffer. |
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