Soybean is the most important genetically modified crop in the world, comprising almost 60% of the biotechnological planted area. The doubts raised by the use of genetically modified organisms (GMO) lead to the compulsory labelling for food products containing more than 0.9% of authorised GMO in the EU. The analysis of DNA coupled with polymerase chain reaction (PCR) has been the technique of choice to monitor the presence of GMO in food