Effect of peeling on the natural sedimentation process of fragrant sesame oil
In the refining process of fragrant sesame oil,its natural sedimentation pattern is affected by many factors.In order to explore the technique to improve the refining efficiency of fragrant sesame oil,fragrant sesame oil obtained from peeled and unpeeled sesame was used as the research object,the compositions of crude sesame oil and precipitates were measured,and the changes in precipitates content,phospholipids content,acid value,peroxide value,and compression rate of precipitates during the sedimentation process were analyzed to investigate the effect of sesame peeling on the natural sedimentation process of fragrant sesame oil.The results showed that compared with unpeeled sesame oil,the peeled fragrant sesame oil showed a high sedimentation efficiency of about 5 percentages higher in the linear sedimentation stage.More than 90％of precipitates was crude fat,with small amounts of water,phospholipids,proteins,and sugars forming colloidal impurity,with significant aggregation of water and phospholipids.The acid value of the precipitates was much higher than that of the fragrant sesame oil,but the change of peroxide value was not significant.The changes of phospholipids content showed similar trends with precipitates content,and the differences of phospholipids content and acid value in the upper and lower oil were smaller after the linear sedimentation stage.The initial height of the precipitates of peeled fragrant sesame oil was much lower than that of unpeeled fragrant sesame oil,and the compression rate was faster than that of unpeeled fragrant sesame oil during the linear sedimentation stage as well as the final yield was about 3 percentages higher than that of unpeeled fragrant sesame oil.In conclusion,peeling is beneficial for the natural sedimentation of fragrant sesame oil and achieving higher yield.
sesamepeelingfragrant sesame oilsedimentationphospholipidsperoxide valueacid value
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