| The contents of phthalic acid esters(PAEs), polycyclic aromatic hydrocarbons (PAHs), vitamin E (VE) and sterols , and changes of fatty acid composition, acid value, peroxide value, smoke point, color of sunflower seed oil were analyzed and compared under the deodorization conditions of 220-270?℃, 100 min and 40-120 min, 260?℃ to study the effects of deodorization conditions on the comprehensive quality of sunflower seed oil. The results showed that with the deodorization temperature increasing and deodorization time prolonging, the removal rates of each PAEs and PAHs component increased gradually,the contents of VE and sterol decreased gradually with retention rates decreasing from 94.6% to 632% and 94.4% to 81.6%, and the content of trans fatty acids increased gradually from 0.17% to 116%. Synthesizing the effects of different deodorization conditions on PAEs, PAHs, VE, sterol, trans fatty acid and other quality indexes, the appropriate deodorization conditions based on PAEs and PAHs removed deeply were 260?℃, 80-100 min. Under these conditions,the retention rates of VE and sterol were 73%-75% and 82%-85%, and the content of trans fatty acids was 0.88%-0.90%. The appropriate deodorization conditions were 260?℃, 60 min or 220?℃, 100 min based on ensuring BaP content meet the national standard, and under the conditions of 260?℃, 60 min, the retention rates of VE and sterol were 79.3% and 854%, respectively, and the content of trans fatty acids was 0.69%; while the retention rates of VE and sterol were both above 94%, and the content of trans fatty acids was 0.17% under the deodorization conditions of 220?℃, 100 min. The optimal deodorization conditions could be selected according to the content of the risk ingredient of the bleaching oil and the requirement of the deodorization product oil, and the comprehensive quality of sunflower seed oil could be improved by using the precise deodorization technology. |
