[Contrastive analysis of volatile oil from Serissa serissoides in different seasons].

To provide the foundation for reasonable utilization by analysing the essential oils from Serissa serissoides in different seasons. Essential oils were obtained by steam distillation. The chemical components were separated and identified by gas chromatography-mass spectrometer (GC-MS). The relative content of each component was determined by area normalization. Forty-three peaks were identified from autumn material, representing 78.91% of the total oil. Main constituents of the essential oil from the autumn material were found to be 1b,5,5,6a-tetramethyl-octahydro-1-oxa-cyclopropa [a] inden-6-one (7.32%); methyl linolenate (4.14%); cubenol (5.97%); 2-methoxy-4-vinylphenol (10.87%); delta-9(10)-tetrahydrocostunolide-1-keto (35.51%). Seventy-two peaks were identified from spring material, representing 79.88% of the total oil. Main constituents of the essential oil from the spring material were found to be caryophyllene (3.315%); ethylbenzene (3.523%); 3-hexen-1-ol (4.537%); 2-methoxy-4-vinylphenol (6.513%); 5-propionyl-2-chlorobenzeneacetic acid, methyl ester (8.541%), germacrene D (12.311%). The same compounds in both materials are as follows: 2,2-dimethyl-6-methylene-cyclohexanepropanol; 2-methoxy-4-vinylphenol; 3,7-dimethyl-1,6-octadien-3-ol; cubenol; docosane and eicosane. It seems that they are the diagnostic components in these medicinal materials. Essential substances are different in quantity and quality in different seasons.