Quantitative analysis of multi-components with single marker for determination of alkaloids in Phellodendri Amurensis Cortex Quantitative analysis of multi-components with single marker for determination of alkaloids in Phellodendri Amurensis Cortex Study on procedure of seed quality testing and seed grading scale of Phellodendron amurense Regional characteristic analysis of alkaloids and chlorogenic acid in wild Phellodendri Amurensis Cortex Simultaneous determination of jatrorrhizine, palmatine, berberine, and obacunone in Phellodendri Amurensis Cortex by RP-HPLC Feasibility analysis on Phellodendri Amurensis Cortex planting in Chengde