Abstract: The essential oil of the peel and flesh of Garcinia mangostana L. was obtained by simultaneous distillation and solvent extraction. The chemical compositions were separated and identified by GC/MS and relative contents were determined by area normalization. The results were that: the yield of the essential oil from the peel is 0.14%, and 22 chemical constituents separated and identified in the peel was found to be 92.68%. The yield of the essential oil in the flesh is 0.21%, and 11 chemical constituents separated and identified in the flesh was found to be 69.11%. Vinyl, Paphthalene and Acid appeared to the major chemical constituents in the oil of the peel; and Alcohol, Vinyl and so on appeared to the flesh. The predominant ones of which in the peel and the flesh was .alpha.-Cubebene (relative content: 32.41% and 41.38%).

Key words: volatile oil, Garcinia mangostana L, GC/MS