Antibacterial Activity of Soft Coral Species From the Island Garden City of Samal

Abstract / Excerpt:

Methanol extracts of nine soft coral species from the Island Garden City of Samal (IGACOS) were tested for their antibacterial activity against four species of bacteria. The results of the Analysis of Variance show that the activity of all nine soft coral species tested against Staphylococcus aureus and Bacillus subtilis are highly significant. In the test against Staphylococcus aureus, it was Cladeilla sp. that gave the highest zone of inhibition followed by Anthelia sp., Dendronephthya sp., Sinularia sp. 2, Sarcophyton sp. 1, Sarcophyton sp. 2, Nephthea sp., Sinularia sp. 1, and Xenia sp. the latter giving the smallest zone of inhibition. All nine species also tested positive against Bacillus subtilis showing range of activity from highest to lowest as follows: Xenia sp., Anthelia sp., Nephthea sp., Dendronephthya sp., Cladiella sp., Sinularia sp. 2, Sinularia sp. 1, Sarcophyton sp. 1, Sacrophyton sp. 2. The test for Salmonella enteritidis and Escherichia coli were negative for all nine species.

Results show that the methanolic extracts of soft coral species were effectively against Gram-positive bacteria. This finding is, however, far from being conclusive as only two species of Gram-positive bacteria were used as basis for sensitivity. Further tests, using more species of both Gram-positive and Gram-negative bacteria is recommended.

Full Text

Methanol extracts of nine soft coral species from the Island Garden City of Samal (IGACOS) were tested for their antibacterial activity against four species of bacteria. The results of the Analysis of Variance show that the activity of all nine soft coral species tested against Staphylococcus aureus and Bacillus subtilis are highly significant. In the test against Staphylococcus aureus, it was Cladeilla sp. that gave the highest zone of inhibition followed by Anthelia sp., Dendronephthya sp., Sinularia sp. 2, Sarcophyton sp. 1, Sarcophyton sp. 2, Nephthea sp., Sinularia sp. 1, and Xenia sp. the latter giving the smallest zone of inhibition. All nine species also tested positive against Bacillus subtilis showing range of activity from highest to lowest as follows: Xenia sp., Anthelia sp., Nephthea sp., Dendronephthya sp., Cladiella sp., Sinularia sp. 2, Sinularia sp. 1, Sarcophyton sp. 1, Sacrophyton sp. 2. The test for Salmonella enteritidis and Escherichia coli were negative for all nine species.

Results show that the methanolic extracts of soft coral species were effectively against Gram-positive bacteria. This finding is, however, far from being conclusive as only two species of Gram-positive bacteria were used as basis for sensitivity. Further tests, using more species of both Gram-positive and Gram-negative bacteria is recommended.

Info
Source JournalAgham Mindanaw
Journal VolumeAgham Mindanaw Vol. 3
AuthorsVirgilio G. Dela Rosa
Page Count7
Place of PublicationDavao City
Original Publication DateJanuary 1, 2006
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