Aktivitas Antibakteri Bacillus yang Berasosiasi dengan Landak Laut di Pantai Mentigi, Lombok Barat

Bambang Fajar Suryadi, Novi Febrian


The search for new antimicrobial agents is very significant. The prevalence of antimicrobial
resistance among key microbial pathogens is increasing at an alarming rate worldwide. Bacillus
species produce many kinds of antibiotics which share a full range of antimicrobial activities.
The aim of this research is to study antibacterial activity of three bacillus isolates (1A, 2J, 3L)
which were isolated in Mentigi Beach, West Lombok. Assessment for antibacterial activity was
conducted using Overlaid Molten agar method on Nutrient Agar medium at different salinity
(concentration of NaCl 0, 5, 10%) and different pH (pH 6, 7 and 8). The study showed that there
were different antibacterial activities at different salinity and different pH media. Production of
antibacterial at 0% NaCl concentration occurred only at pH 6 and 7 and had narrow spectrum
character (only for Gram positive bacteria). Addition of 5% NaCl made antibacterial
production might occur at pH 6, 7 and 8 and had wide spectrum character (for Gram positive
and negative bacteria).


Antibacterial, Bacillus, sea urchin

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DOI: https://doi.org/10.24002/biota.v15i3.2586


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