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| Changes in tocopherol and phytosterol contents during the production of rapeseed oil from imported rapeseed |
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| DOI：10.19902/j.cnki.zgyz.1003-7969.240290 |
| KeyWord:rapeseed oil tocopherol phytosterol oil refining loss rate deodorized distillate |
| FundProject: |
| Author Name | Affiliation | | YU Lei1, SUN Yuping2, FU Wenzhi2, ZHAN Yaming2,
QIU Changlu2, ZHOU Min2, LI Sihua2 | (1.COFCO Oils & Fats Holdings Limited, Beijing 100020, China
2.COFCO (Dongguan) Grain and Oil
Industry Co. , Ltd. , Dongguan 523145, Guangdong, China) |
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| Abstract: |
| In order to develop high-quality rapeseed oil processing technology, imported Canadian rapeseed was used as raw material to compare and analyze the contents of tocopherol and phytosterol in pressed and leached crude rapeseed oil, as well as the changes of these two indicators during the refining process. The results showed that the contents of tocopherol and phytosterol in the pressed crude rapeseed oil were 662-706 mg/kg and 7 731-8 568 mg/kg, respectively, and the contents of tocopherol and phytosterol in the leached crude rapeseed oil were 774-885 mg/kg and 9 177-10 136 mg/kg, respectively. The two types of crude rapeseed oil mainly containγ- tocopherol and α- tocopherol. During the refining process, both tocopherol and phytosterol in rapeseed oil were lost in each section, with total loss rates ranging from 11.37% to 18.84% and 3.27% to 11.89%, respectively. Among them, tocopherol had the highest loss in the deodorization section, while phytosterol had higher loss rates in the neutralization and deodorization sections. The changes in the proportion of each component of tocopherol in rapeseed oil in the neutralization and deodorization sections were in the order of α- tocopherol>(β+γ)-tocopherol>δ-tocopherol. The α-tocopherol proportion in neutralization section decreased, and (β+γ)-tocopherol proportion increased, and deodorization section was the opposite. Increasing the acid value of neutralized oil led to a corresponding increase in the acid value and decrease in tocopherol content of the deodorized distillate. In summary, the contents of tocopherol and phytosterol in leached crude rapeseed oil are higher than that in pressed crude rapeseed oil. Both tocopherol and phytosterol are lost in various refining sections. By appropriately controlling the degree of deacidification, the loss of tocopherol in rapeseed oil can be reduced. |
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