Abstract: In this study, the proximate chemical composition of premna leaves was found be made up of pectin 35.57%, protein 18.70%, crude fat 4.27%, coarse fiber 6.87%, total flavonoids 73.43 mg/1 g, and total polyphenols 29.44 mg/1 g. Further, the chemical composition of volatile oil extracted from the leaves of plant by steam distillation extraction was analyzed by gas chromatography-mass spectrometry (GC-MS). A total of 68 compounds were identified in the oil, including 14 alcohols (24.5%), 14 alkenes (18.85%), 8 ketones (8.81%), 6 esters (7.95%), 8 aldehydes (6.41%), 2 furans (3.95%), 3 alkyls (1.93%), caryophyllene oxide (9.71%), 1,1,5,6-tetramethyl-indene (3.06%), longleaf pine terpenes-(V4) (1.25%) and so on, of which, 1-octene-3-alcohol (11.45%), caryophyllene oxide (9.71%), alpha-caryophyllene (5.82%) and trans-beta-ionone (3.43%) were the dominant components.

Key words: premna, chemical composition, gas chromatography-mass spectrometry (GC-MS), volatile oil composition