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| Changes of tocopherol in soybean oil and its deodorized distillate during refining process |
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| DOI： |
| KeyWord:soybean oil deodorized distillate refining process tocopherol tocopherol isomer loss rate proportion |
| FundProject: |
| Author Name | Affiliation | | (1.COFCO (Dongguan) Grain and Oil Industry Co. , Ltd. , Dongguan 523145, Guangdong, China;
2.COFCO Donghai Grain and Oil Industry (Zhangjiagang) Co. , Ltd. , Suzhou 215600, Jiangsu, China) | (1.COFCO (Dongguan) Grain and Oil Industry Co. , Ltd. , Dongguan 523145, Guangdong, China
2.COFCO Donghai Grain and Oil Industry (Zhangjiagang) Co. , Ltd. , Suzhou 215600, Jiangsu, China) |
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| Abstract: |
| Aiming to provide a reference for accurate and moderate processing of soybean oil to retain micronutrients, the content of tocopherol and its isomers proportion in crude oil, neutralized oil, decolorized oil, deodorized oil, and deodorized distillate processed with the soybean from Brazil and the United States was determined to study the changes rule of tocopherol in various refining stages and the proportion rule of tocopherols isomers. The results showed that tocopherol was lost in all refining stages, and the loss in deodorization stage was the largest with the loss rates of tocopherol and α-, γ-,δ- tocopherol were 11.68%-19.37%, 610%-1764%, 11.56%-19.68%, and 17.29%-2551%, respectively, and 3 isomers in deodorization stage and the whole refining both showed the following loss rates: δ- tocopherol>γ- tocopherol>α- tocopherol. Compared with crude oil, the proportion of α-,γ-tocopherol in refined soybean oil increased by 0.4-2.1 percentage points and 0.1-1.2 percentage points, respectively, and the proportion of δ-tocopherol decreased by 1.3-2.7 percentage points, indicating that δ- tocopherol was more easily decomposed or volatilized at high temperatures, and was carried into the deodorized distillate by the stripping steam. The acid value of US crude soybean oil was below 1.5 mgKOH/g, and the content of tocopherol in deodorized distillate was 97 419-109 123 mg/kg, which was 80-89 times that of crude oil. The acid value of Brazilian crude soybean oil was 1.5-3.3 mgKOH/g, and the content of tocopherol in deodorized distillate was 34 678-83 803 mg/kg, which was 59-84 times that of crude oil. The proportion of α-,γ-,δ- tocopherol in US and Brazilian deodorized distillate were 6.5%-9.3%,61.0%-62.4%,26.7%-31.4% and 84%-9.9%，58.0-61.8%，28.0%-30.4%, respectively. Compared with the corresponding deodorized oil, the proportion of α- tocopherol and γ-tocopherol decreased by 0.1-2.5 percentage points，4.5-6.7 percentage points and 05-2.9 percentage points，2.9-6.9 percentage points, respectively, and the proportion of δ- tocopherol increased by 5.5-8.2 percentage points and 5.6-78 percentage points,indicating that the rate of tocopherol trapped by stripping vapor was δ -tocopherol> α -tocopherol> γ -tocopherol. Therefore, the process conditions of the deodorization stage should be optimized to avoid excessive loss of tocopherol to the greatest extent possible. |
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