The ionic liquid dispersive liquid phase microextraction(ILDLPME) was developed and its mechanism was investigated;ILDLPME coupled with high performance liquid chromatography(HPLC) was introduced for the determination and evaluation of five kinds of low abundance phenylpropionic acid compounds of Rhizoma typhonii from different origins.The main parameters affecting the performance of ILDLPME were optimized.Under the optimized parameters,the linear ranges were 1.28×10-3—2.60 μg/mL for caffeic acid,1.28×10-4—...