Abstract:Walnut green husk was taken as raw material.Microwave assisted extraction of pectin from walnut peel and the extraction process was optimized.On the basis of single factor test，the 3 factors of microwave temperature，microwave power and pH value of liquid are determined as independent variables.The Box-Benhnken experimental design was carried out with the response value of pectin yield，and the relationship between the independent variable and the response value was studied.To establish and analyze the mathematical model of the factors and indicators，to establish the optimum extraction technology of pectin from walnut peel.The results showed that the optimum conditions of microwave assisted extraction of pectin from walnut peel for microwave temperature 56℃，microwave power 540 W，extraction liquid for pH 3.5.The theoretical value of the yield of pectin under this condition was 90.117 4 mg/g，The actual yield of pectin was 89.769 4 mg/g.The relative error between the theoretical values of the model analysis was 0.39%<0.5%.It shows that the regression equation obtained after optimization has some practical guiding significance.Acid water bath microwave assisted method compared with the traditional walnut peel pectin yield increased to 11.56%.