超声波处理对全蛋液流变特性的影响

Effect of ultrasonic treatment on the rheological properties of liquid whole egg

采用不同超声声能密度(0.4,0.8,1.2,1.6,2.0W/g)及超声作用时间(0,5,10,15,20min)对全蛋液进行处理,再用流变仪测其流变特性。试验结果表明,全蛋液是一种假塑性非牛顿流体,具有剪切稀化现象,其流变曲线在温度为0~40℃时服从Herschel-Bulkley模型。随着超声作用时间及声能密度的增大,全蛋液的流变特性指数增大,屈服应力及黏稠系数减小,流动性增加,全蛋液的非牛顿流体特性减弱,牛顿流体特性增强。动态流变试验结果表明,随着超声作用时间及声能密度的增大,全蛋液的损耗模量G″和贮能模量G′均减小,说明全蛋液的黏性特征和弹性特征均减弱,流动性增强,与静态流变试验结果一致。

In order to study the effect of ultrasonic treatment on the rheological properties of liquid whole egg, the different ultrasonic energy density (0.4, 0.8, 1.2, 1.6, and 2.0 W/g) and the ultrasonic time (0, 5, 10, 15, and 20 min) on the liquid whole egg were studied, and then the rheological properties of rheometer was measured. The static rheological experimental results showed that the egg was a pseudoplastic non-Newtonian fluid with the shear thinning phenomenon. The rheological curve was obedient to the Herschel-Bulkley model at the temperature of 0~40 ℃. With the increase of ultrasonic time and ultrasonic energy density, the index of rheological properties and liquidity of liquid whole egg were increased, and the yield stress and viscosity coefficient were decreased, which weaken the non-Newton fluid characteristics and enhanced Newton fluid characteristics. Dynamic rheological experimental results showed that with the increase of ultrasonic time and ultrasonic energy density, both the loss modulus and the storage modulus were decreased, and the viscosity characteristics and elastic characteristics were decreased. Finally, the liquidity of the liquid whole egg was enhanced, and this phenomenon was consistent with the static rheological experimental results.