Gas Chromatography-Mass Spectrometry Analysis of the CO_2 Supercritical Fluid Extract of Zingiber officinale Rosc.and Tracing of gingerol

Objective To analyze the CO2 supercritical fluid extract of Zingiber officinale Rosc.by gas chromatography-mass Spectrometry and trace the ginger constituents in the extract.Methods Zingiber officinale Rosc.was extacted by CO2 supercritical fluid technology and was analyzed by gas chromatography-mass spectrometry.6-gingerol and 10-gingerol were directly injected into gas chromatography-mass spectrometry.The chromatograms of the extract and gingerols were compared under the same condition.Results Fifty-two constituents were identified from the extract.6-gingerol was partially decomposed to hexanal and zingerone,and 10-gingerol was completely decomposed to decanal and zingerone.Conclusion Volatile and non-volatile constituents in ginger are both obtained by CO2 supercritical fluid technology.Gingerols are found to undergo complete or partial thermal dehydraton to aliphatic aldehyde and zingerone under gas chromatography-mass spectrometry by McLafferty rearrangement.