RESULTS:Aristolochic acid A content in above-ground parts of Herba Asari was higher than that in the root,and aristolochic acid A was not detected ever in some Radix et Rhizoma Asari.

• 结果:细辛药材根及根茎中不含马兜铃酸A或含量极低,叶中均含马兜铃酸A,含量稍高。