Abstract: In this study,the leaf,stem,and fruit of Pseudocalymma alliaceum were distilled and the essential oil composition was studied by GC-MS.The identified components constituted 97.6%,95.4% and 97.4% of the leaf,stem,and fruit oils,respectively.The major components of different parts of P.alliaceum were sulfur-containing compounds,amounting to 78.4%,54.0% and 81.0% of essential oil composition in leaves,stems,and fruits,respectively.The result showed that the main constituents of the essential oil of leaves,stems,and fruits oils were diallyl disulphide(48.9%,25.4% and 34.2%) and diallyl trisulfide(18.4%,14.0% and 29.8%).It was concluded that the essential oil composition of P.alliaceum was similar with the garlic Allium sativum, especially to sulfur-containing compounds.The garlic vine P.alliaceum is a potential substitute of A.sativum and its pharmaceutical effects need to be studied in the future.

Key words: Pseudocalymma alliaceum, diallyl disulphide, diallyl trisulfide, essential oil, GC-MS