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Ethanol precipitation is a method used to purify and/or concentrate RNA, DNA and polysaccharides such as pectin and xyloglucan from aqueous solutions by adding ethanol as an antisolvent.Contents.thanol precipitation is a method used to purify and/or concentrate RNA, DNA and polysaccharides such as pectin and xyloglucan from aqueous solutions by adding ethanol as an antisolvent. Contents.
1 DNA is insoluble in ethanol (ethyl alcohol). 2  As ethanol is added to a solution containing DNA, the DNA will come out of solution and stick to whatever is around. 3  At room temperature DNA begins to denature by the action of DNase (present in cell extracts). 4  DNA extraction procedures must be carried on in ice.rocedure: 1  Place 100 ml of homogenizing solution in a beaker heat the solution in a water bath until it reaches 60 C. 2  Mince the onion and add to the solution when it has reached 60 C. Stir and let sit for 15 minutes.