Fig. 2

DL analysis of Alpinia officinarum Hance samples. a DL decay curves comparison among Alpinia officinarum Hance samples. BG = background. b Comparison of DL properties among the Alpinia officinarum Hance samples. I0 is the initial intensity of the DL curve, Beta is an index factor associated with the rate of DL decay, and Tau and T represent the DL characteristics and decay time, respectively. *p < 0.05. c PCA score plots of the DL properties obtained from Alpinia officinarum Hance samples. d PCA biplot indicating how each parameter influences the similarity of DL decay curves