This study aims to identify the essential oils composition, phytochemicals, and antioxidant activity of Syzygium pyrifolium (Blume) DC. leaves and bark extracts. The essential oils were obtained using hydrodistillation technique and their chemical compositions were determined by gas chromatography and gas chromatography-mass spectrometry. Phytochemicals were separated using various chromatography techniques and their structures were elucidated using infrared, nuclear magnetic resonance, ultraviolet, and mass spectrometry. Antioxidant activity of the essential oils, extracts, and selected phytochemicals was determined using the total phenolic content and free radical scavenging assay. Results showed that S. pyrifolium leaf oil mainly consists of geraniol (73.8%), β-pinene (7.0%), α-pinene (5.7%), and (E)-β- ocimene (4.5%). Geraniol was successfully separated from the leaf oil as a pure compound. The bark oil contains cuparene (7.2%), β-elemene (6.8%), longifolene (5.6%) .....

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