The availability of sufficient quantities of quality DNA is always a crucial point in DNA-based methods, i.e. for PCR, DNA sequencing, Southern blotting, and microarrays . The same is true for the PCR-based methods of GMO detection in food . During the production chain foods passes several physical, biological, and chemical processes, which all negatively influences on the quantity of available DNA. The phenomenon is especially expressive when high temperature treatment is performed at low pH .
The existing methods, for DNA isolation from food, cannot always fulfill the expectations of quantity and quality of isolated DNA. Furthermore they usually include 100 mg of sample and are difficult to scale-up . Four major chromatographic modes are used for the separation of DNA: size-exclusion, anionexchange, ion-pair reverse-phased, and slalom chromatography. Of these, anionexchange chromatography combined with micropellicular packing is described as the most prominent technique so far .