Detection of GMOs in food products from soybean and corn in Phitsanulok

Abstract

Twenty-six food products of soybean and corn from markets and supermarkets in
Phitsanulok were collected randomly. Modified CTAB method is suitable for DNA extraction in this
study. The lectin and zein genes were found in 19 products. PCR-base method for the detection of
genetically modified soybean and corn was used. CaMV 35S promoter was found in 5 soybean
products and 5 corn products. Besides, nos-terminator was detected in 2 products of corn but not in
all products of soybean. Therefore, soybean products were not confirmed for GMOs. The result
showed that 2 products of corn were genetically modified corn: popcorn seed (not labeled) and corn
beverage (labeled).

Keywords: Genetically modified soybean and corn, GMOs