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  Indian J Med Microbiol
 

Figure 1: The multiple analyses of the Cortex Phellodendri amurensis and Cortex Phellodendri chinensis samples by ultra-performance liquid chromatography-quadrupole/time-of-flight mass spectrometry analysis (a) principal component analysis scores plots in (+) ESI mode; (b) principal component analysis scores plots in (−) ESI mode; (c) the S-plot in (+) ESI mode; (d) the S-plot in (+) ESI mode when the ions were except m/z 336 and m/z 352; (e) the S-plot in (−) ESI mode; and (f ) the variable importance parameter column plot of the ions whose variable importance parameter value is more than three in (−) ESI mode. The ions in red box were choose to be the potential markers in S-plots, and the white columns in variable importance parameter plot were present the corresponding ions in S-plot. ESI: Electrospray ionization

Figure 1: The multiple analyses of the Cortex <i>Phellodendri amurensis</i> and Cortex <i>Phellodendri chinensis</i> samples by ultra-performance liquid chromatography-quadrupole/time-of-flight mass spectrometry analysis (a) principal component analysis scores plots in (+) ESI mode; (b) principal component analysis scores plots in (−) ESI mode; (c) the S-plot in (+) ESI mode; (d) the S-plot in (+) ESI mode when the ions were except <i>m/z</i> 336 and <i>m/z</i> 352; (e) the S-plot in (−) ESI mode; and (f ) the variable importance parameter column plot of the ions whose variable importance parameter value is more than three in (−) ESI mode. The ions in red box were choose to be the potential markers in S-plots, and the white columns in variable importance parameter plot were present the corresponding ions in S-plot. ESI: Electrospray ionization