Abstract
Marine sponge Callyspongia sp. is one full of potency as a source for discovering and developing novel antibacterial. This study aims to isolate the Callypsongia sp. and assay their antibacterial activity. Callyspongia sp. were macerated with ethyl acetate (3x24 hrs), isolated with vacuum liquid chromatography (VLC) and RC (radial chromatography), and determined their structure with 1H and 13C-NMR. The antibacterial activity was assayed with the microdilution method. From ethyl acetate extract of Callyspongia sp. was successfully 2 isolated compounds, namely, isolate C1 (cholesterol) and isolate C2 (Unknown alkaloid with carbonyl from aldehyde group). The extract has MIC>512 µg/mL against Bacillus subtilis, Escherichia coli, Streptococcus mutans, and Salmonella enterica. While in both isolates provided MIC value >256 µg/mL against B. subtilis, E. coli, and S. mutans, yet in S. enterica provided 128 µg/mL for isolate C1 and 256 µg/mL for isolate C2. In conclusion, ethyl acetate extract of Callyspongia sp. contains cholesterol and Unknown alkaloid with carbonyl from the aldehyde group, and they both exhibited low antibacterial susceptibility.
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