Abstract: This paper mainly studies in the ultrasound-assisted water extraction process of Xanthotoxin from Peucedanum praeruptorum Dumn.With the absorbency of Peucedanum praeruptorum Dumn for index,to xanthotoxin amount of a pigment absorbance value of the target in single-factor test, based on the orthogonal design method of ultrasonic assisted xanthotoxin water extraction process was optimized to investigate ultrasonic extraction temperature, extraction power, extraction time and solid to liquid ratio on the extraction of xanthotoxin component of absorbency. The ultrasound-assisted water extraction and xanthotoxin in a prime optimum technology for: ultrasonic temperature is 50 ℃, ultrasonic power is 176W, extraction time of 40min, solid to liquid ratio of 1:20. The optimized method can be applied for the extraction of active components in roots of Peucedanum praeruptorum Dunn．
Keywords：Peucedanum praeruptorum Dumn；xanthotoxin；8-methoxypsoralen；ultrasound-assisted water extraction
