Optimization of development processing parameters of malic acid- modified starch by using RSM

In this study,sweet potato starch was reacted with malic acid to prepare modified starch with high degree of substitution( DS). Reaction conditions,which include malic acid and starch mass ratio,reaction temperature,p H and reaction time,were optimized by response surface methodology to obtain maximum DS. The optimizing reaction conditions were obtained using RSM.The optimum reaction conditions were found to be reaction at 160 ℃ and p H 2.0 for 6 h with a malic acid-to-starch ratio of 0.57( m / m),resulting in a DS as high as 0.354.