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Methods DNA extraction from liquid samples ended up being done using four different methods. Two methods utilize a chaotropic buffer to extract DNA and market the discerning binding of DNA to a silica membrane (GuSCN-silica and GFX system). The other strategy will be based upon the lysis and digestion for the samples in buffer and proteinase K, adsorption of impurities by an "InhibitEX" insertion matrix and purification regarding the DNA by a silica column (QIAamp Kit).