TOOLS Cell Free DNA Kit is based on silica-membrane technology and provides a special buffer system. Genomic DNA binds to the silica-membrane in the presence of high salt, while the contaminants pass through the column. After the membrane is thoroughly washed to remove the remaining contaminants, the pure DNA is eluted from the membrane with a low salt buffer. The kit is used for the isolation of DNA from serum/plasma. Purified genomic DNA can directly serve as templates for PCR, restriction enzyme digestion, hybridization, etc.