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Antimicrobial Agents Produced by Marine Aspergillus terreus var. africanus Against Some Virulent Fish Pathogens

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Abstract

Screening of fungal isolates collected from different locations of Alexandria coast, Egypt, was carried out to obtain new biologically active metabolites against some virulent fish pathogens (Edwardsiella tarda, Aeromonas hydrophila, Vibrio ordalli and Vibrio angularuim). Among 26 fungal isolates, Aspergillus terreus var. africanus was identified as the most potent isolate. Production of the bioactive material was optimized using response surface methodology including fermentation media, incubation period, temperature, pH, and thermo-stability. Spectral properties of the gas chromatography/mass spectrum of the ethyl acetate crude extract were determined. Partially purified components of the crude extract were chromatographically separated and bioassayed. Out of ten separated compounds, five were with considerable antibacterial agent. The bio-toxicity of crude showed a slight toxicity against the brine shrimp Artemia salina (LC50 = 1,500 μg/l). Antibacterial activity of the crude was compared with some known standard antibiotics and found to be superior over many where its MIC against some pathogen reached 1 μg/ml.

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Authors and Affiliations

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

    Khouloud M. Barakat

  2. Botany and Microbiology Department, Faculty of Science, Alexandria Univ, Alexandria, Egypt

    Yousry M. Gohar

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  1. Khouloud M. Barakat
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  2. Yousry M. Gohar
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Correspondence to Khouloud M. Barakat.

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Barakat, K.M., Gohar, Y.M. Antimicrobial Agents Produced by Marine Aspergillus terreus var. africanus Against Some Virulent Fish Pathogens. Indian J Microbiol 52, 366–372 (2012). https://doi.org/10.1007/s12088-012-0255-1

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  • DOI: https://doi.org/10.1007/s12088-012-0255-1

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