Response surface methodology for optimizing process of surfactant /microwave- assisted extraction pectin of Malus micromalus Makino

The effect of Sodium dodecyl sulfate ( SDS) concentration, extraction temperature, extraction time and extraction solventvolume on the extraction process of Pectin Sodium dodecyl sulfate ( SDS) as theextractant from Malus micromalus Makino with the microwave- assisted extraction technology were investigated systemati- cally in this paper. The extraction parameters were optimized by the response surface methodology. The optimum conditions were as follows: SDS concentration was 0.8%, extraction temperature was 50℃, the volume of extraction solvent used per gram dried Malus micromalus Makino was 15 m L, extraction time was 14 min, extraction p H value was 2.0.Repeated extraction for two times and the extraction rate was up to 16.1%.The predictionvalues of the fitted quadratic regressionmodelwell agreedwith the experimental values.