PERTANIKA JOURNAL OF TROPICAL AGRICULTURAL SCIENCE

The preliminary ichthyotoxic test on all parts of Syzygium malaccense (Myrtaceae) revealed hat the leaves fraction was the most ichthyotoxic against tilapia-fish (Tilapia oreochromis). hree compounds, namely ursolic acid (1), β-sitosterol (2) and sitost-4-en-3-one (3), were solated and their structures were elucidated with the aid of spectroscopic data and omparison with previously reported investigations. However none of these compounds gave any significant ichthyotoxicity. The volatile constituents of the leaves and fruit were determined by Gas Chromatography-Mass Spectrometer (GC-MS), with 180 and 203 compounds being identified in the aroma concentrates, respectively.