The essential oil composition from the leaves of Strychnos axillaris Colebr. (Loganiaceae) growing in Malaysia was examined for the first time. The essential oil was obtained by hydrodistillation and fully characterized by gas chromatography (GC-FID) and gas chromatography-mass spectrometry (GC-MS). In total, 15 components were identified in the essential oil, which made up 87.2% of the total oil. The essential is composed mainly of α-ionone (20.2%), β-ionone (19.5%), bicyclogermacrene (19.2%), and geranyl acetate (10.2%).

The fruits, aerial parts and roots of Neomuretia pisidica (Kit Tan) Kljuykov, Degtjareva & Zakharova were extracted with n-hexane. Total of 18 compounds were characterised by GC analyses of the n-hexane extracts. Main volatile components of the n-hexane extract of aerial parts were characterized as 1,8-cineole (23.4 %), camphor (21.4 %), 2-ethyl hexanol (14.6 %), α-pinene (7.2 %), and verbenone (6.4 %). Methyl linoleate (19.3 %), 1,8-cineole (16.5 %), camphor (13.2 %), α-pinene (6.1 %) and 2-ethyl hexanol (4.9 %) were found in the n-hexane extract of roots. Whereas, 1,8-cineole (23.3 %), camphor (20.3 %), 2-ethyl hexanol (14.2 %), α-pinene (9.9 %), and limonene (4.1%) were the major components of the n-hexane extract of fruits. Antimicrobial activity were identified using a microdilution assay against selected human pathogenic strains. The most potent inhibitor activities with 156 µg/mL concentrations were detected against S. aureus and E. faecalis.