Phenol (removes protein) 1.add equal volume of Phenol (= tris-saturated Phenol-Chloroform-Isoamyethanol) 2.vortex 3.spin 2 minutes at 12000 rpm 4℃ 4.transfer supernatant to a fresh tube (avoid aspiration of the interlayer or organic phase) Chloroform (removes phenol) 1.add equal volume of Chloroform 2.vortex 3.spin 2 minutes at 12000 rpm 4℃ 4.transfer supernatant to a fresh tube (avoid aspiration of the interlayer or organic phase) 100% Ethanol (precipitates DNA) 1.add 0.1 volume 3 M sodium acetate 2.add 2.5 volumes 100 % Ethanol 3.vortex 4.precipitate at: -20℃overnight (+++) -80℃1 h (++) dry ice 15min (+) 5.spin 20 minutes at 12000 rpm 4℃ 6.carefully pour out / aspirate supernatant (do not lose DNA-pellet) 70% Ethanol (washes out salt) 1.carefully add 1 mL cold 70% Ethanol (do not vortex) 2.spin 10 minutes at 12000 rpm 4℃ 3.carefully pour out / aspirate supernatant (do not lose DNA-pellet) 4.air dry 10 minutes at room temperature (do not overdry, because DNA becomes hard to dissolve) 5.dissolve in: 10 mM Tris pH 7.5 (+++) TE-Buffer (++) - EDTA may inhibit downstream enzymatic reactions . dH2O (+) - freeze at -20℃because unbuffered DNA undergoes degradation . |
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