The Antibacterial Activity of some Red Sea Soft Corals species

Document Type : Original Article

Authors

1 Microbiology Lab., National Institute of Oceanography and Fisheries, Alexandria Branch

2 Marine Biology Department, Faculty of Science, Suez Canal University.

3 Marine Environment Division, National Institute of Oceanography & Fisheries, Hurghada branch.

4 Marine Science Department, Faculty of Science, Port Said University.

Abstract

The present study aimed to investigate the antibacterial properties of crude extracts from some soft coral species from the Red Sea, Hurghada, Egypt. Crude extracts of Lobophytum pauciliforum, Dendronephthya hemprichi, Sarcophyton
gracile, Sarcophyton glaucum, Sinularia gardineiri, Sinularia leptoclados, Nephthea pacifica, Sarcophyton acutum, Sarcophyton spongosium and Xenia macrospiculata, were tested against fish and human pathogenic bacteria. The well cut - diffusion technique was used to determine the absolute activity units (AU) and the minimal inhibitory concentrations (MICs) using disc-diffusion technique were determined against the most affected bacterial pathogens (E. coli and S. aureus). The AU of the ethanolic crude extract ranged from 1.4 to 25.0 for Sarcophyton acutum and
Lobophytum pauciliforum, respectively. On the other side, ethyl acetate crude extracts showed the highest AU (16.0) for L. pauciliforum against S. aeurus, followed by (11.1) of N. pacifica and X. macrospiculata against). The MIC of L. pauciliforum ethyl acetate crude extract was recorded as (50 mg ml-1) against both E. coli and S. areaus ATCC 6358.
Extracts from some soft corals showed the ability to inhibit the growth of some pathogenic bacteria indicating that it could be used for medical purposes. 

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Egyptian Journal of Aquatic Biology and Fisheries
Volume 16, Issue 2
May and June 2012
Pages 13-26

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