Abstract:
The effect of soybean oil deodorization and distillates trapping process on the contents of eight phthalic acid esters (PAEs),vitamin E and phytosterol in deodorized oil and deodorizer distillates condensate trapping fluid were investigated.The results showed that compared with deodorization by single temperature (240,250,260℃),the dual-temperature deodorization (200℃,90 min;then 260℃,30 min) could improve the removal rate of∑8PAEs by 4.7-22.6 percent points,and the retention rate of vitamin E and phytosterol by 5.5-13.1percent points and 6.3-13.4 percent points,respectively,while the content of trans fatty acid decreased by 0.11-1.04 percent points.The dual-temperature deodorization process was superior to single temperature deodorization on improving the safety and nutritional quality of soybean oil.Moreover,the contents of ∑ 8PAEs in the trapping fluid of soybean oil deodorizer distillates of two-stage dual-temperature condensation trapping processes (SOOD1,SODD2)(120℃,40℃) were both significantly lower than the single-stage condensate trapping fluid (SODD)(40℃).The content of∑8PAEs in SOOD was 2.98 and 1.58 times of those in SOOD1 and SODD2,respectively,and the content of ∑ 8PAEs in SOOD1 was 16.741 mg/kg,which was only half of that in SODD2.The contents of VE and sterol in SODD1 were 1269.2 and 1336.9 mg/100 g respectively,while in SODD2 were 769.4 and 995.9 mg/100 g respectively,Although the contents of VE and sterol were lower than those in SODD,the lower PAEs content of SODD1 significantly improved the safety quality of SODD1 as food grade raw material.