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| Analysis of oxidation stability of soybean oil stored under different conditions based on 1H NMR |
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| DOI：10.12166/j.zgyz.1003-7969/2020.11.020 |
| KeyWord:1H NMR soybean oil packaging material antioxidant oxidation stability |
| FundProject:北京市科技计划 |
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| Abstract: |
| In order to investigate the oxidation stability of soybean oil stored under different packaging materials and the presence or absence of antioxidants, the peak signals of the primary oxidation products and secondary oxidation products in auto-oxidation process of soybean oil were quantitatively analyzed based on 1H NMR method. Soybean oils packaged in dark green frosted bottle, white frosted bottle, transparent glass bottle, and soybean oil containing THBQ packaged in transparent glass bottle were used as experimental objects, and they were placed in a 40 ℃ oven with sufficient fluorescent light to perform constant temperature oxidation, and sampling analysis was performed regularly. The results showed that 1H NMR method could effectively identify five kinds of oxidation products in soybean oil, which were the primary oxidation products of Z, E type and E, E type conjugated olefin hydroperoxide, and the secondary oxidation products of N-aldehyde, E, E-conjugated dienal and E-conjugated alkenal; 1H NMR method could effectively monitor the content of oxidation products. After single-factor ANOVA statistical analysis, the antioxidant TBHQ (0.05 g/kg) had a significant delay effect on the primary oxidation process of soybean oil in the early stage (within 70 d)(p＜0.05), and the dark green frosted bottle packaging (protected from light) had a significant delay effect on the secondary oxidation process of soybean oil(p＜0.05). |
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