Fig. 2

Flow chart of this work. a Flow chart of the experiment design process (b) Flow chart for establishing a standard fingerprint chromatogram \( R{\text{Intens}} .= \frac{{{\text{Intens}} .}}{{{\text{SPH}} \times {\text{W}}}},\quad R{\text{RT }} = \frac{\text{RT}}{\text{SRT}}, \) where RIntens is the relative Intensity, RRT is the relative retention time, SPH and SRT are the peak height and retention time, respectively, of the internal standard (IS), and W was sample weight (g)