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Isolation and characterization of lactic acid bacteria producing a potent anti-listerial bacteriocin-like inhibitory substance (BLIS) from chhurpi, a fermented milk product

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Abstract

Nowadays, the bacteriocin industries have seen significant growth, supplanting chemical preservatives in its ability to improve the shelf-life and safety of food. The increasing customer desire to use natural preservatives has fueled advancing bacteriocin research. The objective of this study was to identify lactic acid bacteria (LAB) that produce bacteriocin-like inhibitory substance (BLIS) and have strong anti-listerial activity. We have identified and analyzed a LAB obtained from chhurpi samples, a popular milk-derived product in the Himalayan regions of India and Nepal. The strain was studied and identified based on its morphological, biochemical, and physiological characteristics. Furthermore, the molecular 16s-rDNA analysis suggests that the strain was Lactococcus sp. RGUAM1 (98.2% similar to Lactococcus lactis subsp. hordniae NBRC 100931T). The isolated strain can produce a potent BLIS, which has shown efficacy against three gram-positive bacteria responsible for food spoilage, such as Listeria monocytogenes (MTCC 657), Staphylococcus aureus subsp. aureus (MTCC 87), Lactobacillus plantarum (MTCC 1407), Lactobacillus paraplantarum (MTCC 12904). The scanning electron microscope (SEM) image illustrates that the crude cell-free supernatant (CFS) disrupts the cell envelope, leading to the release of cellular contents and the clustering of cells. In addition, this BLIS can easily withstand a wide range of pH (2–12), temperature (up to 100 °C for 15 min), bile salt (0.3% W/V), salinity (4% W/V), and enzyme activity of 1600 AU/ml against Listeria monocytogenes. Our research offers a robust framework and valuable insights into bio-preservation and its potential applications in diverse food products.

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Acknowledgements

AM is thankful to S.V.M.C.M. scholarship (WBP211618382055), Govt. of West Bengal, India. The authors are thankful to the Mr. Sanjeet Manna and Central Instrumentation Facility (C.I.F.), Odisha University of Agriculture and Technology (O.U.A.T.), Odisha, India, for the scanning electron microscope (S.E.M.) analysis.

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The authors declare that no funds, grants, or other support were received during the preparation of this manuscript.

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A.M. and S.C.J. designed the initial study; A.M. was involved in writing, image presentation, and table preparation; S.C.J. was involved in manuscript refinement, important intellectual content discussion, and overall supervision; and A.M. and S.C.J. were engaged in reviewing and editing the manuscript.

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Correspondence to Subhas Chandra Jana.

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The authors have no conflict of interest regarding the publication of this article. The authors have no relevant financial or non-financial interests to disclose.

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Communicated by Sunita Varjani.

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Manna, A., Jana, S.C. Isolation and characterization of lactic acid bacteria producing a potent anti-listerial bacteriocin-like inhibitory substance (BLIS) from chhurpi, a fermented milk product. Arch Microbiol 206, 73 (2024). https://doi.org/10.1007/s00203-023-03797-1

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  • DOI: https://doi.org/10.1007/s00203-023-03797-1

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