核桃仁超声波辅助碱液去皮工艺优化

Optimization of ultrasonic assisted alkali peeling process of walnut kernel

以核桃仁为原料,采用超声波辅助碱液去皮的工艺,在单因素实验的基础上选择以Na OH溶液浓度、超声温度、碱烫时间、超声功率作为实验因素,以去皮率为考察指标,运用响应面法优化得出核桃仁去皮的最优工艺。验证实验结果表明:当Na OH溶液的浓度为0.8%,超声温度为64℃,碱烫时间为4.5 min,超声功率为380 W时,三次验证实验的平均去皮率为5.46%±0.02%,去皮容易,清水冲泡后几乎整皮脱落,去皮效果最好,并且核桃仁质地酥脆,颜色乳白,无碱味,表明该优化工艺可行。

This study took walnut kernel as raw material and the technology of ultrasonic assisted alkali peeling was adopted.On the basis of single factor tests,the concentration of Na OH solution,ultrasonic temperature,alkali hot time and ultrasonic power were selected as the test factors,and peeling rate as examine index.The optimum process of walnut kernel peeling was optimized by using the response surface method. The test results showed that when the concentration of Na OH solution was 0.8%,ultrasonic temperature was 64 ℃,alkaline hot time was 4.5 min,ultrasonic power was 380 W,the average peeling rate of three tests was 5.46% ± 0.02%,and that the walnut peeling effect was the best,almost all of the skin could fall off after rinsing with water and the walnut had crisp texture and white color and no alkali flavor,which indicated that the optimized process was feasible.