The amplifiability of DNA extracted from samples
were confirmed by PCR amplification using soybean
specific (lectin gene) and maize-specific (invertase
gene or zein gene) primers for samples containing
soybean or maize respectively. As shown in the result
section, 85.0% samples were amplifiable, indicating
whether the samples contained either soybean or
maize or both materials. The good amplifiable DNA of
processed food was in agreement with a study which
verified DNA extracted from highly processed food
products using CTAB method demonstrated good
amplification result (Mafra et al., 2008). Gryson et al.
(2004) also demonstrated that even highly processed
food extracted using CTAB extraction method could
be amplified.