Response Surface Methodology for Optimization of Extraction Process of Soluble Dietary Fiber from Navel Orange Residue

Navel orange residue was treated with cellulase to extract soluble dietary fiber.Extraction parameters including extraction temperature,cellulase dose and length of extraction time were optimized using Box-Behnken design and response surface methodology based on single factor investigations for achieving maximum yield of soluble dietary fiber.A regression equation reflecting the relationship between the yield of soluble dietary fiber and the extraction parameters was set up.The optimal extraction parameters were found as follows: extraction temperature,48 ℃;cellulase dose,1.25%;length of extraction time,5 h.Under the optimized conditions,the actual yield of soluble dietary fiber was 13.11%,close to the predicted value of 13.14%.