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| Deep removal of 3-monochloro-1,2-propanediol esters and glycidyl esters in oils by two-stage molecular distillation |
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| DOI： |
| KeyWord:edible vegetable oil 3-monochloro-1,2-propanediol esters glycidyl esters molecular distillation deep removal |
| FundProject:“十三五”国家重点研发计划子课题（2016YFD0 401405） |
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| Abstract: |
| 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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