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| 两级分子蒸馏深度脱除油脂中3-氯丙醇酯和缩水甘油酯 |
| Deep removal of 3-monochloro-1,2-propanediol esters and glycidyl esters in oils by two-stage molecular distillation |
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| DOI： |
| 中文关键词: 食用植物油 3-氯丙醇酯 缩水甘油酯 分子蒸馏 深度脱除 |
| 英文关键词:edible vegetable oil 3-monochloro-1,2-propanediol esters glycidyl esters molecular distillation deep removal |
| 基金项目:“十三五”国家重点研发计划子课题（2016YFD0 401405） |
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| 中文摘要: |
| 对3-氯丙醇（3-MCPD）酯和缩水甘油酯（GEs）含量超标幅度大的1个玉米油和2个稻米油样品分别进行两级分子蒸馏，研究两级分子蒸馏对油脂中3-MCPD酯和GEs的脱除效果，同时测定其对油脂中VE、甾醇和谷维素含量的影响。结果表明：3个油脂样品中3-MCPD酯含量为6169~16.008 mg/kg，超出欧盟建议限量（1.25 mg/kg）的3.94~11.81倍，GEs含量为7.004~56.399 mg/kg，超出欧盟限量（1.00 mg/kg）的6.00~55.40倍；经一级分子蒸馏，油脂中3-MCPD酯的脱除率为49%~68%，GEs脱除率为42%~90%；经二级分子蒸馏，油脂中3-MCPD酯和GEs的脱除率分别达到93%~96%和91%~98%，含量分别降低至0.368~0.932 mg/kg和0.545~0900 mg/kg，均明显低于欧盟限量；经二级分子蒸馏，3个油脂样品VE保留率为11%~14%，甾醇保留率为59%~75%，稻米油中谷维素保留率为88%~89%。采用两级分子蒸馏能实现油脂中高含量3-MCPD酯和GEs的深度脱除，但同时也会造成油脂中VE、甾醇等活性成分的较严重损失。因此，可根据油脂中3-MCPD酯和GEs的超标程度合理选用一级分子蒸馏或两级分子蒸馏。 |
| 英文摘要: |
| Two-stage molecular distillation was performed on one corn oil and two rice bran oil samples with excessive contents of 3-monochloro-1,2-propanediol esters (3-MCPD esters) and glycidyl esters (GEs), and the deep removal effects of two-stage molecular distillation on 3-MCPD esters and GEs in oil were studied, the effects on the contents of VE、sterol and oryzanol were also studied. The results showed that the 3-MCPD esters content in the three oil samples (6.169-16.008 mg/kg) exceeded the EU recommended limit (1.25 mg/kg) by 3.94-11.81 times, and the GEs content (7004-56.399 mg/kg) exceeded the EU limit (1.00 mg/kg) by 6.00-55.40 times. After one-stage molecular distillation, the removal rate of 3-MCPD esters was 49%-68%, and the removal rate of GEs was 42%-90%. After two-stage molecular distillation, the removal rates of 3-MCPD esters and GEs were 93%-96% and 91%-98%, respectively,with the contents 0368-0.932 mg/kg and 0.545-0900 mg/kg, which were lower than the EU limit. After two-stage molecular distillation, among the three oil samples, the sterol retention rate was 59%-75%, the VE retention rate was 11%-14%, and the oryzanol retention rate in rice bran oil was 88%-89%. The use of two-stage molecular distillation could achieve efficient and deep removal of high content of 3-MCPD esters and GEs in oil, but it could also cause serious losses of active ingredients such as VE and sterols in oils. One-stage molecular distillation or two-stage molecular distillation could be reasonably selected according to the degree of excess of 3-MCPD esters and GEs in oil. |
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