Quantitative Determination of Aucubin in Eucommia ulmoides of Different Harvest Periods and Parts by HPLC

Quantitative determination of aucubin in Eucommia ulmoides from different collection periods and parts by HPLC.The samples were collected from April to September.The content of the sample collected in April was the highest,and then decreased gradually.The order of contents of aucubin in different parts was as follows:bastleafbranchcork.And the content of aucubin in bast was higher than the others obviously.