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| Bleaching effects of several decolorants on rapeseed oilWANG Weijun, HUANG Fenghong, LIU Changsheng, |
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| DOI：10.12166/j.zgyz.1003-7969/2020.01.005 |
| KeyWord:attapulgite activated clay activated carbon hydrogen peroxide rapeseed oil bleaching |
| FundProject:国家自然科学基金资助项目（31772010，31871838）；中国农业科学院基本科研业务费专项（Y2019LM12） |
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| Abstract: |
| With the color and chlorophyll content of rapeseed oil as evaluation indexes, the bleaching effects of attapulgite, activated clay, activated carbon and hydrogen peroxide on rapeseed oil at medium and low temperature (40-80 ℃) were compared,and the bleaching effects of composite decolorant including attapulgite-activated carbon and activated clay-activated carbon were also studied. The results showed that the bleaching effect of activated carbon with lower addition amount was equivalent to that of attapulgite and activated clay with higher addition amount. The bleaching effect of activated clay-activated carbon was better than that of attapulgite-activated carbon. With 2% addition amount, the chlorophyll content in rapeseed oil reduced by 32.5% at 80 ℃, and the red value reduced by 30.6% at 70 ℃. Hydrogen peroxide solution had an obvious effect on removing the chlorophyll and reducing the red value of rapeseed oil. At 70 ℃, the chlorophyll content reduced by 9.0% with 0.4% hydrogen peroxide solution (10%), and the red value reduced by 25.0% with 0.6% hydrogen peroxide solution(10%). The quality indexes of activated clay-activated carbon and hydrogen peroxide bleached oils reached the national standard of grade four rapeseed oil. In terms of the bleaching effect of decolorant with unit mass concentration, hydrogen peroxide solution had a higher bleaching efficiency. |
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