Plumbagin Contents in the Above-ground Parts of Plumbago zeylanica L.at Different Harvest Periods

摘要： Objective To analyze the plumbagin content in the above-ground parts of Plumbago zeylanica L.at different harvest periods.Methods The powder was soaked in 50 mL anhydrous methanol for 24 h.Then,ultrasonic extraction was carried out for 40 min,so as to obtain the extracting solution.Plumbagin contents in the branches of P.zeylanica at different harvest periods were detected by HPLC,so as to obtain the optimal collection period.Results The content of plumbagin in the branches of P.zeylanica enhanced from March to October,and reached the maximum at October (0.033%).Then,it decreased from October to the next February.The content of plumbagin was the minimum at February,which was only 0.009%.Conclusions Plumbagin content in the branches of P.zeylanica was the maximum in October,so the period from September to October was the optimal collection time. ... （共3頁）