Determination of Eucalyptole in Eucalyptus Oil by Gas Chromatography Simultaneous determination of α-pinene, β-pinene, eucalyptol and α-terpineolin in essential oil from Alpinia officinarum Hance by GC Preparation of emulsion-hydrogel transdermal patch of essential oil from Artemisiae Argyi Folium and its transdermal characteristics Comparative analysis on essential oil in wild and cultivated Mentha haplocalyx from Yunnan Province by GC-MS Comparative analysis on essential oil in wild and cultivated Mentha haplocalyx from Yunnan Province by GC-MS Simultaneous determination of α-pinene, β-pinene, eucalyptol and α-terpineolin in essential oil from Alpinia officinarum Hance by GC