To establish the representative chromatographic fingerprint, 10
batches of the PPPs samples from different areas of ShaanxiLintong were analyzed using the optimized HPLC method and
matched by the Similarity Evaluation System for Chromatographic
Fingerprint of Traditional Chinese Medicine (Version 2004A). Common
peaks are defined as the chromatographic peaks which are
appeared in all the samples. There are 34 common peaks in HPLC
fingerprints (Fig. 1A). Among these 34 peaks, 15 peaks which have
relatively high intensity were chosen as the ‘‘characteristic fingerprint
peaks’’ to represent the characteristics of the PPPs (Fig. 1B).
Eight components were identified as gallic acid (peak 1),