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When silica matrices are used, the DNA is eluted in an aqueous buffer such as TE or nuclease-free water.
Finding a suitable DNA isolation system to satisfy your downstream application needs is vital for the successful completion of experiments.
PN100 Transfection-quality plasmid DNA in as little as ten minutes using the Pure Yield™ Plasmid Miniprep System PN082 Promega's SV membrane technology: The evolution of an indispensable laboratory tool The primary consideration for plasmid purification is separation of plasmid DNA from the chromosomal DNA and cellular RNA of the host bacteria.
A number of methods have been developed to generate a cleared lysate that not only removes protein and lipids but also efficiently removes contaminating chromosomal DNA while leaving plasmid DNA free in solution.
The binding of DNA to silica seems to be driven by dehydration and hydrogen bond formation, which competes against weak electrostatic repulsion (Melzak 1996).
Hence, a high concentration of salt will help drive DNA adsorption onto silica, and a low concentration will release the DNA.