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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.
The word detergent is used instead of soap in a DNA extraction buffer. Detergent is used to create a hydrophobic environment that favors the precipitation of proteins. Proteinâ¦s are one of two major contaminants in DNA extraction (the other major contaminant being RNA).