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| 地下储油与地上储油对油脂品质的影响 |
| Effect of underground storage and above-ground storage on oil quality |
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| DOI： |
| 中文关键词: 地下储油 低温储油 大豆原油 菜籽原油 油脂品质 |
| 英文关键词:underground storage low temperature storage crude soybean oil crude rapeseed oil oil quality |
| 基金项目: |
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| 中文摘要: |
| 油脂在储存过程中，其品质指标易受温度等因素的影响。将大豆原油和菜籽原油储存于室外地上和埋于室外地下的钢制储罐，定期取样测定油脂的水分及挥发物、酸值、过氧化值、色泽、挥发性成分、脂肪酸组成、反式脂肪酸含量、氧化稳定性及甾醇和维生素E含量,考察不同储油方式对大豆原油和菜籽原油品质的影响。结果表明：地下储油温度变化较小，基本在11~27 ℃之间，地上储油温度变化较大，最高接近45 ℃，最低接近0 ℃；地上、地下储油中均未检出反式脂肪酸，储油方式对油脂水分及挥发物、色泽、脂肪酸组成影响较小；储存12个月时，地上、地下储存大豆原油酸值升幅分别为83.3%、12.5%，地上、地下储存菜籽原油酸值升幅分别为86.4%、19.0%，地上、地下储存大豆原油过氧化值升幅分别为243%、218%，地上、地下储存菜籽原油过氧化值升幅分别为219%、167%；地下储油的氧化稳定性优于地上储油，地下储油对部分重要挥发性成分和甾醇、维生素E等油脂营养成分的的保留效果优于地上储油。总的来说，地下储油是良好的油脂品质保鲜技术，不但能控制氧化速率，对营养价值及风味的保持效果也较好。 |
| 英文摘要: |
| In the storage process of oil, its quality index is susceptible to temperature and other factors. The crude soybean oil and crude rapeseed oil were stored in steel storage tanks which were placed on the outdoor above-ground and buried outdoors, and regular samples were taken to determine the moisture and volatile matter, acid value, peroxide value, color, volatile components, fatty acid composition and trans fatty acid content, oxidation stability and contents of sterol and vitamin E. The effects of different storage methods on the quality of crude soybean oil and crude rapeseed oil were investigated. The results showed that the temperature of oil stored underground varied little, basically between 11 ℃and 27 ℃, while the temperature of oil stored above-ground varied greatly with the highest temperature close to 45 ℃, and the lowest close to 0 ℃. No trans fatty acid was detected in oils stored above-ground and underground. The effects of oil storage method on moisture and volatile matter, color and fatty acid composition were little. When the oil was stored for 12 months, the acid value of crude soybean oil stored above-ground and underground increased by 83.3% and 12.5%, and for crude rapeseed oil, they increased by 86.4% and 19.0%, respectively; the peroxide value of crude soybean oil stored above-ground and underground increased by 243% and 218%, and for crude rapeseed oil, they increased by 219% and 167%, respectively. The oxidation stability of oil stored underground was better than that of oil stored above-ground, and the retention effects of underground storage on some important volatile components and oil nutrients such as sterol and vitamin E were better than those of above-ground storage. In general, underground storage was a good oil quality preservation technology, and it could not only control the oxidation rate, but also maintain the nutritional value and flavor. |
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