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Quick Answer. Ethanol is used in DNA extraction to force the DNA to precipitate in a solution. In order to collect a DNA sample, cells are broken down through agitation, then mixed with water, salt and ethanol to create an aqueous solution.
Extracting DNA involves a series of steps to gently break open the cell, break open the nuclear membrane, separate the DNA from proteins and then cause it to precipitate out of a solution.This is accomplished using various chemicals, based on the structure of membranes, DNA and its electronegativity.Sodium chloride, or other sodium-containing compounds, are used to stabilize the DNA after it has been stripped of its proteins and aid in precipitation.o recover DNA for further testing or visualization, the DNA must be precipitated out of a solution with water. Since water has a relatively weak positive charge, this is accomplished by providing a stronger positively charged ion in the solution. Sodium is the perfect candidate for this.