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| Deacidification effect of rice bran oil by extraction-adsorption method |
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| DOI： |
| KeyWord:extraction deacidification adsorption deacidification rice bran oil oryzanol phytosterol tocopherol |
| FundProject:湖北省技术创新重大专项(2019ABA105) |
| Author Name | Affiliation | | LI Bing1, YUAN Renkang2, HE Junbo2, QI Yutang2, ZHANG Weinong2 | 1.China Grain Wuhan Science Research and Design Institute Co. , Ltd. , Wuhan 430079, China
2. College of Food Science and Engineering, Wuhan Polytechnic University, Wuhan 430023, China |
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| Abstract: |
| In order to retain nutrients in rice bran oil as much as possible while deacidifying, a low-temperature physical deacidification technology of ethanol extraction deacidification combined with alkaline microcrystalline cellulose adsorption deacidification was used to the deacidification of rice bran oil. The rice bran oil deacidified with ethanol extraction method was used as material, and the deacidification process of alkaline microcrystalline cellulose adsorption method was optimized by single factor experiment and orthogonal experiment using deacidification rate as the index. At the same time, the effects of alkali refining and ethanol extraction combined with adsorption deacidification on the quality of rice bran oil were compared. The results showed that the optimal conditions for adsorption deacidification method were as follows: alkaline microcrystalline cellulose amount 3.0%, adsorption time 2.0 h, and adsorption temperature 40 ℃. Under the optimal conditions, the acid value of rice bran oil decreased from 35.04 mgKOH/g (crude oil) to 0.92 mgKOH/g, the retention rate of oryzanol was 73.0%, the total phytosterol retention rate was 74.3%, and the total tocopherol retention rate was 56.5%. The acid value of rice bran oil with alkali refining decreased from 35.04 mgKOH/g(crude oil) to 1.16 mgKOH/g, and the retention rates of oryzanol, total phytosterol and total tocopherol were 60.1%, 65.6% and 44.6%, respectively. In conclusion, compared with traditional alkali refining, extraction combined with adsorption deacidification method has higher retention rate of oryzanol, phytosterol and tocopherol in rice bran oil, and better removal effect of free fatty acids. |
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