Presence of endogenous genes in the samples
confirmed that the CTAB DNA extraction method
used was adequate for the extraction of amplifiable
soybean or maize DNA from the samples. For samples
which were not amplified, either the DNA content was
insufficient, or there were PCR inhibitors affecting
them. Food samples comprise of complex mixture
containing PCR inhibitors that may compromise the
amplifiability of DNA (Pirondini et al., 2010).