Optimization for soluble dietary fiber extraction from orange peel by response surface methodology

In order to obtain optimum for soluble dietary fiber from orange peel extracted by supercritical CO2,Response surface methodology was conducted to the optimal parameters on the basis of single factor investigations.The results showed that the yield of soluble dietary fiber was mainly affected by pH,temperature and time.A regression model was established by response surface methodology and very significant with R-squared 0.984 6.the optimum extraction conditions of soluble dietary fiber were identified as pH 1.5,extracting time 2.28 h,extracting temperature 92.2 ℃ and homogenized pressure 29.7 MPa.The experiment was accomplished under the optimum conditions,and the yield of soluble dietary fiber was 25.92%.