Optimization of ultrasonic-assisted aqueous extraction of corn wax lipid from diatomaceous earth
In order to improve the corn oil refining added value and realize the recyclable use of diatomaceous earth,diatomaceous earth containing wax lipid,a by-product of corn oil refining,was used as raw material to extract corn wax lipid by ultrasonic-assisted aqueous method,the effects of different extraction conditions on the extraction rate of corn wax lipid were investigated,and the process conditions for the extraction of corn wax lipid were optimized by response surface methodology.The results showed that the optimal extraction conditions were as follows:ultrasonic power 480 W,ultrasonic time 4 h,extraction temperature 95 ℃,and material-liquid ratio 1∶3.Under these conditions,the extraction rate of corn wax lipid was(59.46±0.91)％.In conclusion,the ultrasonic-assisted aqueous method can effectively extract corn wax lipid from diatomaceous earth.
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