The rapeseed oil was produced by low temperature pressing process using rapeseed as raw material.Three decolorizers,namely,activated carbon,activated white clay and bentonite,were selected for compounding,and the effects of five factors,namely,compounding ratio,compounding decolorizer addition,decolorization time,decolorization temperature and stirring speed,on the decolorization effect of rapeseed oil were studied with decoloriza-tion rate as the index.The optimum decolorization process was optimized by single-factor test and response surface method,and the physicochemical quality,main components and trace components of rapeseed oil were determined.The results indicated that the best decolorization process for rapeseed oil was:time of 35 min,temperature of 100 ℃,stirring speed of 180 r/min,compounding ratio of 2∶1∶1,compounding addition of 3％.Under these conditions,the decolorization rate was 82.2％.The acid value and peroxide value of decolorized rapeseed oil decreased by 21.88％and 51.11％,respectively,and the content of trace components squalene,tocopherol and sterols were increased,a-mong which the content of y-tocopherol was 30.47 mg/kg higher than that of rapeseed crude oil;the difference be-tween saturated fatty acid and unsaturated fatty acid content of rapeseed oil before and after decolorization was not sig-nificant(P＞0.05),being 0.03％and 0.19％,respectively.
Qinghai rapeseed oilcold pressing at low temperaturedecolorization treatment
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