| The fresh soybean oils were stored respectively in PET plastic bottle and PE plastic bottle, and the influences of storage temperature, storage time and light on the contents of plasticizers in the soybean oil were investigated. The results showed that the contents of DBP and DEHP in soybean oils packaged in PE plastic bottle were obviously higher than those in PET plastic bottle when the storage temperature was above 27℃ and storage time was 20 d. The contents of DPP in soybean oils had no change when the temperature didn't exceed 50 ℃, while it rose significantly when the temperature was above 50℃. Furthermore, when stored at 65℃ for 90 d, the contents of DPP in the soybean oils packaged in PET and PE plastic bottles were up to 1 559.3 μg/kg and 2 756.8 μg/kg, respectively. In addition, when stored at 65℃ for 50 d, DMP could be detected in soybean oil packaged in PE plastic bottle, and its contents were 43.7(50 d),128.7(70 d),114.3 μg/kg(90 d). When stored at 50℃ for 90 d, the content of DBP in soybean oil packaged in PE plastic bottle reached 452.0 μg/kg, 1.5 times as high as the national standard limit for DBP. Compared with the lucifuge storage, light had no influence on DPP and small impacts on DBP and DEHP for a short time. Under the same storage temperature and light condition, as storage time prolonging, the content of DBP in soybean oils packaged in PET and PE plastic bottles were on a rise, and the content of DEHP presented a fluctuation trend. |
