Isolation and Identification of Bacteriocin-Producing Bacillus spp from Rastrineobola argentea (Omena) with Activity against Bovine Mastitis Bacterial Pathogens

Juliana Maina^1, , Julius Maina Mathara¹, Gideon M. Kikuvi² and Eliud Wafula¹

¹Department of Food Science and Technology, Jomo Kenyatta University of Agriculture and Technology, P. O Box 62000 (00200), Nairobi-Kenya

²2Department of Public Health, Jomo Kenyatta University of Agriculture and Technology, P. O Box 62000 (00200), Nairobi-Kenya

Cite this paper

Juliana Maina, Julius Maina Mathara, Gideon M. Kikuvi and Eliud Wafula. Isolation and Identification of Bacteriocin-Producing Bacillus spp from Rastrineobola argentea (Omena) with Activity against Bovine Mastitis Bacterial Pathogens. Journal of Food Security. 2021; 9(2):62-75. doi: 10.12691/JFS-9-2-4

Abstract

Rampant use of antibiotics has increased resistance of pathogenic bacteria in both animals and humans. This has triggered the investigation of novel antimicrobial agents produced by a bacterial strain of low virulence with antimicrobial activity with a wide range of clinical significance. This study sought to extract bacteriocins from Bacillus spp that were isolated and identified from Omena (Rastrineobola argentea) and to evaluate the in vitro antimicrobial effect of the obtained bacteriocin against bovine mastitis pathogens. Samples were collected from Lake Victoria using a completely randomized design method followed by isolation of the bacteriocin producing Bacillus spp. Characterization and identification of isolates was done by Gram staining, morphology and Biochemical tests which included catalase, nitrate reduction, methyl Red,-Voges-Proskauer, indole, motility and hydrogen sulphide, growth on Simmons citrate agar, triple sugar iron agar and starch hydrolysis. Antimicrobial activity was done using disc diffusion methods on the nutrient agar and zone of the inhibition measured after 24hours. An analytical profile index system (API 50CH BE, Biomerieux, Inc, France), was also used for identification. Molecular characterization was done by extracting genomic DNA using Qiagen DNA isolation Kit (Qiagen Germany) using the manufacturer's instructions. The gene encoding the 16S rRNA was amplified by PCR using universal bacterial primers pair combination of forwarding primer 27F forward (5′-AGA GTT TGA TCC TGG CTC AG-3′) and 1492R reverse, (5′-GGT TAC CTT GTT ACG ACT T-3′) about Escherichia coli gene sequence. A total of 60 pure isolates were obtained from Omena samples from Lake. Victoria. Morphological characteristics showed varied colour, form, shape and elevation of the pure colonies. About 54 isolates (90%) were gram-positive with spores, while 6 (10%) were gram-negative. Biochemical tests showed varied results among the bacterial isolates. 28 isolates showed antimicrobial activity on E. coli and S. aureus with inhibition measuring between 17-30mm. Analytical profile index system also showed that 20 isolates (71%) were identified as Bacillus subtilis, three isolates (11%) identified as Bacillus pumilus and five isolates (18%) Bacillus mycoides. The Blast analysis of the partial sequences showed100% of the strains of genus Bacillus within the Firmicutes in the domain bacteria. Twenty (20) isolates belong to Bacillus subtilis, Bacillus mycoides represent 18% (5 isolates) while Bacillus pumilus constituted 11% (3 isolates). This study contributes to understanding the use of bacteriocin in the control of diseases in dairy animal farming in Kenya.

Keywords

Bacillus Spp, bacteriocin, Rastrineobola argentea, Lake Victoria

Copyright

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