Chemical Differentiation of Dendrobium officinale and Dendrobium devonianum by Using HPLC Fingerprints, HPLC-ESI-MS, and HPTLC Analyses

Figure 2

The digital standard HPLC fingerprint chromatograms of dried stems of D. officinale and D. devonianum from different regions of China. Among 15 common peaks (peak 1–peak 15), peak 14 was chosen as the reference peak to calculate RA and RRT of different peaks. D. officinale (S1–S10) and D. devonianum (S11–S20) were marked, and the sources were described in the Materials and Methods.