Specific chromatogram of ginger essential oil was studied by ultra performance convergence chromatographic(UPC2) method.The ginger essential oil was diluted with n heptane

and separated on UPC2 system with photo diode array(PDA) detector

using supercritical CO2 as mobile phase and acetonitrile as cosolvent at a flow rate of 08 mL/min by gradient elution.A spectral library for characteristic peaks and standard specific chromatogram of ginger essential oil from Anhui was established.By comparison with the characteristic peaks from PDA library and similarity evaluation

the resemblance of specific chromatogram was found higher than 09 among the ginger essential oil from Anhui and the standard control.The relative standard deviations(RSD) for relative retention time and relative peak area of common peaks were less than 30%.This method has good precision

reproducibility and stability

and could meet the requirements for the evaluation of specific chromatogram.Coupled with cluster analysis and principal component analysis

the UPC2 specific chromatogram method was successfully used to distinguish 20 samples from different habitats.This study provided a novel

convenient and rapid method for the quality control and origin traceability of ginger essential oil.