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| Decolorization effect of three decolorants on soybean oil |
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| KeyWord:decolorant soybean oil decolorization rate pigment soap removal phospholipids removal |
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| Abstract: |
| In order to provide a reference for the application of decolorant in soybean oil refining, the neutralized soybean oil and three commonly used decolorants (activated clay, attapulgite and neutral bentonite) were used as materials, the abilities of decolorization, soap removal and phospholipids removal from soybean oil of three decolorants were investigated. The results showed that the increasing rate of decolorization rate slowed down when the addition amount of activated clay, attapulgite and neutral bentonite exceeded 2%. When the addition amount of decolorants was 3%, the decolorization rates of activated clay, attapulgite and neutral bentonite were 92.1%, 86.9% and 90.7%, respectively. The neutralized soybean oil had absorption peaks at 426, 450, 479 nm and 665 nm. The decolorization ability of the decolorants could be evaluated by the change of the absorbance of the oil sample at the above four wavelengths. When the addition amount of decolorants was 1%, the chlorophyll removal rates of activated clay, attapulgite and neutral bentonite were 87.1%, 67.7% and 54.8%, respectively, the soap removal rates were 84.5%, 83.8% and 78.9%, respectively, and the phospholipids removal rates were 826%, 83.5% and 90.8%, respectively. When the addition amount of decolorants was 3%, the soap removal rate and phospholipids removal rate of the three decolorants reached 100%. In general, the decolorization effect of activated clay is the best, and the adsorption effect for pigments of decolorants can be improved by reducing the soap and phospholipids contents in neutralized oil. |
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