Abstract
The objective of this study was to characterise the antagonistic activity of cellular components of potential probiotic bacteria isolated from the gut of healthy rohu (Labeo rohita), a tropical freshwater fish, against the fish pathogen, Aeromonas hydrophila. Three potential probiotic strains (referred to as R1, R2, and R5) were screened using a well diffusion, and their antagonistic activity against A. hydrophila was determined. Biochemical tests and 16S rRNA gene analysis confirmed that R1, R2, and R5 were Lactobacillus plantarum VSG3, Pseudomonas aeruginosa VSG2, and Bacillus subtilis VSG1, respectively. Four different fractions of cellular components (i.e. the whole-cell product, heat-killed whole-cell product [HKWCP], intracellular product [ICP], and extracellular product) of these selected strains were effective in an in vitro sensitivity test against 6 A. hydrophila strains. Among the cellular components, the ICP of R1, HKWCP of R2, and ICP of R5 exhibited the strongest antagonistic activities, as evidenced by their inhibition zones. The antimicrobial compounds from these selected cellular components were partially purified by thin-layer and high-performance liquid chromatography, and their properties were analysed. The ranges of pH stability of the purified compounds were wide (3.0–10.0), and compounds were thermally stable up to 90 °C. Considering these results, isolated probiotic strains may find potential applications in the prevention and treatment of aquatic aeromonosis.
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S. S. Giri gratefully acknowledge the Department of Science and Technology, Ministry of Science and Technology, Govt. of India for awarding “Innovation in Science Pursuit for Inspired Research [INSPIRE] Fellowship” [IF10575] to pursue Doctoral research.
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Giri, S.S., Sukumaran, V., Sen, S.S. et al. Antagonistic Activity of Cellular Components of Potential Probiotic Bacteria, Isolated from the Gut of Labeo rohita, Against Aeromonas hydrophila . Probiotics & Antimicro. Prot. 3, 214–222 (2011). https://doi.org/10.1007/s12602-011-9078-3
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DOI: https://doi.org/10.1007/s12602-011-9078-3