Effects of peanut testa removal and ultrasonic treatment on peanut oil bodies extraction and its emulsification and antioxidant properties
In order to provide reference for the industrial extraction of peanut oil bodies and the development of new products based on oil body emulsification system,the effects of peanut testa removal and ultrasonic treatment on the extraction of oil body and its emulsification and antioxidant properties were investigated.Different pretreated peanuts were extracted by aqueous phase to obtain oil body,supernatant and precipitation,then the content and distribution of solids,oils and proteins in above three phases were measured,and the emulsifying properties,total polyphenol contents,total flavonoid contents,and antioxidant properties of the oil body were analyzed.The results showed that the removal of peanut testa increased the distribution of oils in oil body from 63.36％ to 65.30％,and the combined treatment of peanut testa removal and ultrasound further increased the distribution of oils in oil body to 68.13％.The peanut testa removal treatment was not conducive to the stability and antioxidant properties of peanut oil body.Compared with the control group,the average particle size of oil body emulsion in the peanut testa removal treatment group increased from 2 510.00 nm to 2 953.67 nm,meanwhile the kinetic stability decreased.In addition,the contents of total polyphenols and total flavonoids in the peanut testa removal treatment group were the lowest,which were 71.01 μg/g and 47.14 µg/g,respectively.Ultrasonic treatment promoted the dissolution of oil body in peanut,and oil body possessed optimal emulsion stability and antioxidant properties.The average particle size of the ultrasonic emulsion was 1 742.00 nm,the emulsifying activity index and emulsion stability index were 114.48 m2/g and 1 848.40 min,respectively,the dynamic stability was the best,and the contents of total polyphenol and total flavonoid were 101.24 pg/g and 59.97 μg/g.In general,the removal of peanut testa is beneficial to the extraction of peanut oil body,but reduces the stability and antioxidant properties.Ultrasonic treatment is not only beneficial to the extraction of peanut oil body,but also enhances the emulsion stability and antioxidant properties of oil body.
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