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An antioxidant compound has been isolated from the leaves of Toona sureni (Blume) Merr. The structure was determined to be methyl 3,4,5-trihydroxybenzoate (methyl gallate), based on UV-vis, FTIR, NMR and MS spectra. The isolated compound exhibited potent antioxidant activity in the α,α-diphenyl-β-picrylhydrazyl (DPPH) radical scavenging test, with IC50 value 1.02 μg/mL.   Keywords: antioxidant activity, methyl gallate, Toona sureni

An antibacterial compound has been isolated from Ficus deltoidea Jack leaves. Based on spectroscopic data (IR, 1H-NMR, 13C NMR 1D and 2D and MS), the structure of this compound was identified as 3β-hydroksilup-20(29)-en, (lupeol), C30H50O. This compound showed antibacterial activities against E. coli, B. subtilis and S. aureus. The minimum inhibition concentration (MIC) against E. coli, B. subtilis and S. aureus are 150, 220 and 130 μg/mL respectively.

Rhodomyrtone, an Antibiotic from Rhodomyrtus tomentosa. --(DACHRIYANUS; SALNI; SARGENT, MELVYN V.; SKELTON, BRIAN W.; SOEDIRO, IWANG; SUTISNA, MUMU; WHITE, ALLAN H.; YULINAH, ELIN; Aust.

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The phenolic compound has been isolated from the leaves of Toona sureni (Blume) Merr and evaluated against 3 microorganisms, including gram-positive and gram-negative bacteria. The structure was determined to be methyl 3,4,5trihydroxybenzoate (methyl gallate), based on UV-vis, FTIR, NMR and MS spectra. The antibacterial activity of the compound was evaluated using an impregnated paper disk method and compared with that of chloramphenicol. It was effective on the inactivation of Escherichia coli , Staphylococcus aureus and Bacillus subtilis. The minimal inhibition concentration (MIC) of the compound was 7.5 mg/mL against all the test bacteria. These results may be an indication of at least one of the pharmacological actions of the leaves of Toona sureni (Blume) Merr.

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