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| Bleaching of high acid value rice bran oil through activated clay combined with silica gel |
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| DOI： |
| KeyWord:high acid value rice bran oil activated clay bleaching silica gel bleaching combined bleaching |
| FundProject:辽宁省教育厅服务地方科研项目（LFW201905） |
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| Abstract: |
| The bleaching of high acid value rice bran oil through activated clay combined with silica gel was studied.The rice bran oil with acid value 27mgKOH/g was firstly bleached by activated clay then by silica gel. With the bleaching rate, oryzanol content and refining rate as indexes, response surface methodology was used to optimize the combined bleaching conditions based on single factor experiment. The results showed that the optimal bleaching conditions for activated clay were obtained as follows: activated clay dosage 2.5%,bleaching time 30 min and bleaching temperature 90 ℃. The optimal bleaching conditions for silica gel were obtained as follows: silica gel dosage 2.0%, bleaching time 30 min and bleaching temperature 82 ℃. Under the optimal conditions, the bleaching rate of rice bran oil was 79.15%, the content of oryzanol was 2.14%, and the refining rate was 90.05% after bleaching by activated clay,and the bleaching rate of rice bran oil was 47%, the content of oryzanol was 2.10%, and the refining rate was 88.36% after bleaching by silica gel. After combined bleaching of activated clay and silica gel, the color of the rice bran oil improved significantly from Y35,R15 of crude oil to Y5, R0.3 (254 mm Rovipon colourimetric bath). |
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