(a)
(b)
Figure 1: HPLC analysis of DBD. The main ingredients of DBD were detected by HPLC which was performed using Agilent 1200 HPLC with G1321A FD. (a) HPLC of DBD sample. (b) HPLC of standards. (1) Astragaloside IV. (2) Ferulic acid.