Elution of Radioactive Cesium from Tofu by Water Soaking.

Elution of cesium-137 (Cs) from tofu into water was investigated to know the behavior of Cs during preservation and cooking. The food processing retention factor () reached 0.55 when tofu was soaked in water at a ratio of 1:2 / for 24 h at 4°C. Doubling the amount of water did not further significantly decrease . When tofu was held in water at a ration of 1:2 w/w at a temperature of 80℃ for 50 min, was 0.72. Increasing the amount of water to 10 times the tofu weight did not further reduce significantly. Cesium-137 is mostly bound to tofu and does not freely diffuse into water. Tofu was then soaked in water at a ratio of 1:2 w/w at 4℃ for 24 h, placed in new water at a ratio of 1:2 w/w, and held at 80℃ for 50 min, resulting in an 0.33. This value is close to an estimated calculated by multiplying the of 0.55 from soaking at 4°C by the of 0.72 from the hot water treatment. The calculated from soybeans sequentially processing into tofu, soaking tofu at 4°C for 24 h and in hot water at 80°C for 50 min was about 0.1, indicating 90% removal of Cs. Degree of decrease in Cs during preservation and cooking of tofu demonstrated in this study will be useful for exposure assessment of Cs through oral intake of contaminated soybeans after processing and cooking.