Abstract:Pig nail was used as raw material to prepare foaming agent. The effects of sodium bisulfite concentration, extraction temperature, extraction time and extraction pH on the extraction process of foaming agent were investigated. The extraction parameters were optimized by the response surface methodology. The optimum extraction conditions as follows: the concentration of sodium bisulfite was 37.06g/L, reaction temperature was 75.4℃, 6.06 hours for extraction time, and the optimum pH was 5.54. Under the optimal condition, the maximum forecasted foam stability time was 32.18h, and verified value was 32h by confirmative test. The relative error was 0.57% which illuminating the regression equation is valid and reliable.