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| Effect of underground storage and above-ground storage on quality of soybean oil |
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| DOI： |
| KeyWord:soybean oil underground oil storage above-ground oil storage TBHQ nitrogen-filling oil storage temperature oil storage quality |
| FundProject:十三五”国家重点研发计划重点专项（2016YFD0401405）；校企合作研发项目“地下储油与地上储油对油脂品质影响的研究（JY28-2017-0101）” |
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| Abstract: |
| In order to study the feasibility of underground oil storage, soybean oil was stored outdoor above-ground and basement steel tanks (single tank capacity 200 kg) for 24 months, respectively, with conventional storage, antioxidant-added TBHQ storage, and nitrogen-filled storage for outdoor storage and natural low-temperature storage for underground storage. The storage temperature was automatically detected and recorded, and the acid value, peroxide value, vitamin E content and sterol content of soybean oil were evaluated monthly. The effect of different storage conditions on the overall quality of soybean oil was investigated. The results showed that the annual average weekly temperature of above-ground storage was 19.5 ℃, with the maximum temperature close to 40 ℃ and the minimum temperature close to 0 ℃, and the monthly average storage temperature in the summer (from June to September) was 33 ℃, the monthly average storage temperature in the winter (from December to March of following year) was 10 ℃; the annual average weekly temperature of underground storage was 16.8 ℃, and the year-round average daily oil temperature ranged from 12 ℃ to 21 ℃. After 24 months of storage, the acid value of the four soybean oils did not exceed the national standard limit, but the acid value of the above-ground conventional storage oil increased significantly more than the others, and its peroxide value exceeded the standard in 7 months; the peroxide value of the underground storage oil and the storage oil with TBHQ did not exceed the standard until 24 months; the peroxide value of the nitrogen-filled storage oil began to exceed the standard in 17 months, and the shelf life of the underground storage oil was extended by 17 months compared with that of the above-ground conventional storage oil. The contents of vitamin E and sterols in the four storage oils continued to decrease with the extension of storage time, but compared with the above-ground conventional storage oil, the loss rates of vitamin E and sterols in the underground storage oil decreased by 19.36 percentage points and 8.57 percentage points, respectively. Compared with above-ground storage, underground storage without adding antioxidants and filling with nitrogen could achieve quality and freshness storage of soybean oil relying on natural constant low temperature and light-proof conditions, which was a green and safe oil storage technology and worth for promoting the application. |
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