GC-MS Analysis of the Essential Oil of Coral Ginger (Zingiber corallinum Hance) Rrhizome Obtained by Supercritical Fluid Extraction and Steam Distillation Extraction

The chemical compositions of volatile oils extracted from Zingiber corallinum Hance were obtained by steam distillation extraction (SDE) and supercritical fluid extraction (SFE) followed by gas chromatography-mass spectrometry analysis. The effects of pressure, temperature, modifier volume, and extraction time on the SFE of Z. corallinum oil were investigated, and optimization of the conditions were: extraction temperature, 30 A degrees C; dynamic extraction time, 40 min; pressure, 10 Mpa; and modifier volume, 50 mL. 29 compounds from SFE extracts were identified. The main components were sabinene (16.19%), terpinen-4-ol (16.26%), beta-sesquiphellandrene (3.26%), triquinacene 1, 4-bis (methoxy) (22.01%), triquinacene 1,4,7-tris (methoxy) (3.66%), 1-[4-(1-methyl-2-propenyl) phenyl] ethanone (9.87%) and ferulic acid methyl ester (16.88%) accounting for 88.13% of all compounds. SFE extracts were found to be markedly different from the corresponding SDE extracts. 22 compounds from SDE extracts were identified. The major components, accounting for 92.48% of SDE extracts, were sabinene (53.38%), alpha-terpinene (3.23%), gamma-terpinen (2.16%), terpinen-4-ol (22.66%), beta-sesquiphellandrene (1.41%) and triquinacene, 1, 4-bis (methoxy) (9.64%).