In the past, we had reported monitoring results of Roundup Ready Soybean (RRS, 40-3-2) from soft soybean curds (kinugoshi-tofu) that were distributed at Matsumoto-city and its suburbs. However the results of other processed soybean products that were distributed there were unknown. In addition, the other genetically modified soybean, Roundup Ready 2 yield (MON89788, RRS2) and Liberty Link Soybean (A2704-12, LLS), had been detectable from Nov. 2012 in Japan. So we have monitored processed soybean products that were distributed Matsumoto-city and its suburbs from Nov. 2012 to Oct. 2014. Sixty six samples of soy milks, 53 samples of deep-fried tofu (abura-age), 51 samples of fried tofu (nama-age), 44 samples of toasted soybean flour, 30 samples of freeze-dried tofu (koori-tofu), 18 samples of deep-fried tofu mixed with thinly sliced vegetables (gan-modoki), 8 samples of raw soybean curds (nama-yuba) and 6 samples of dried soybean curds (yuba) were examined. Thirty five samples of soy milks, 50 samples of deep-fried tofu, 29 samples of fried tofu, 8 samples of toasted soybean flour, 27 samples of freeze-dried tofu, 15 samples of deep-fried tofu mixed with thinly sliced vegetables and 2 samples of raw soybean curds were RRS positive. 16 samples of soybean milks, 48 samples of deep-fried tofu, 3 samples of fried tofu, 5 sample of toasted soybean flour, 11 samples of freeze-dried tofu, 11 samples of deep-fried tofu mixed with thinly sliced vegetables and 2 samples of raw soybean curds were RRS2 positive. 3 samples of soy milks, 20 samples of deep-fried tofu, 3 samples of fried tofu and 3 samples of deep-fried tofu mixed with thinly sliced vegetables were LLS positive. The differences of genetically modified organism positive rate between soybean products were observed. Differences of processed manufacture, especially processed temperature, lead the differences of degradation of DNA and had an effect on genetically modified soybean positive rate. The numbers of RRS2 and LLS positive samples were less than RRS positive samples because RRS2 and LLS were developed after RRS was developed, and the crop acreage of RRS2 and LLS were smaller than that of RRS.
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