Ultrasonic-microwave synergistic extraction of pectin from leaves of Premna Microphylla Turcz

The ultrasonic-microwave synergistic extraction was adopted to optimize the extraction process of the pectin from leaves of Premna Microphylla Turcz. The single factor analysis and orthogonal test were designed to confirm the main factors and the optimum condition. The results showed that the optimum condition was as following:pH1.5,extraction time 500 s,solid:liquid ratio 1∶15(w∶v) ,microwave power 100 W. Under these conditions,the extraction rate of pectin and its transmission were 19.41% and 92.50%,respectively.