%0 Journal Article %A ZHANG Wenting %A KONG Xiulin %A SUN Jian %A XU Fei %A ZHU Hong %A YUE Ruixue %A ZHANG Yi %A NIU Fuxiang %T Optimization of Extraction Process of Polyphenols From Sweet Potato Leaves by Response Surface Methodology %D 2018 %R 10.11869/j.issn.100-8551.2018.12.2397 %J Journal of Nuclear Agricultural Sciences %P 2397-2405 %V 32 %N 12 %X In order to optimize the extraction process of polyphenols from sweet potato leaves using a ultrasonic assisted method. Box-Behnken response surface analysis method was used on the basis of single-factor experiment. The differences of polyphenol content in different varieties of sweet potato leaves and roots were compared. The results showed that the optimum extraction conditions of sweet potato leaves polyphenols were as follows: ethanol concentration fraction of 73%, extraction time of 35 min, and liquid-material ratio of 40 mL·g-1. Under this condition, the polyphenol content of oven-drying sample of the variety Xushu 36 sweet potato leaves was 32.92±0.093 mg·g-1 (RSD=0.21%). The content of polyphenols in leaves and tubers of 12 sweet potato cultivars was determined and analyzed. That there was a significant difference in the polyphenol content of sweet potato. Among them, the contents of polyphenols with in leaves and tubers of the variety Xuzishu 6 were the highest. The content of polyphenols in different flesh color sweet potato tubers was roughly purple meat type > red (yellow) meat type > white meat type. The results of this study provide a theoretical basis for the development and utilization of the leaves of sweet potato. %U https://www.hnxb.org.cn/EN/10.11869/j.issn.100-8551.2018.12.2397