| Potential application of the nisin Z preparation of Lactococcus lactis W8 in preservation of milk. | |
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MedLine Citation:
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PMID: 21554339 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Aims: The aim of the study is to evaluate the effectiveness of the preparation of nisin Z from Lactococcus lactis W8-fermented milk in controlling the growth of spoilage bacteria in pasteurized milk. Methods and results: Spoilage bacteria isolated from pasteurized milk at 8 and 15°C were identified as Enterococcus italicus, E. mundtii, E. faecalis, Bacillus thuringiensis, B. cereus, Lactobacillus paracasei, Acinetobacter sp, Pseudomonas fluorescens and Enterobacter aerogenes. These bacteria were found to have the ability to survive pasteurization temperature. Except Enterobacter aerogenes, the spoilage bacteria were sensitive to the nisin Z preparation of the L. lactis W8. Addition of the nisin Z preparation to either the skim milk or fat milk inoculated with each of the spoilage bacteria reduced the initial counts (about 5 log CFU ml(-1) ) to an undetectable level within 8 to 20 h. The nisin Z preparation extended the shelf life of milk to two months under refrigeration. Conclusions: The nisin Z preparation from L. lactis W8-fermented milk was found to be effective as a back-up preservative to counteract post-pasteurization contamination in milk. Significance and impact of the study: A rapid inhibition of spoilage bacteria in pasteurized skim and fat milk with the nisin Z preparation of L. lactis W8 is more significant in comparison to the commercially available nisin (nisin A). The nisin Z preparation can be used in stead of commercial nisin, which is not effective in fat milk. |
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Authors:
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Suranjita Mitra; Bidhan Chandra Mukhopadhyay; Swadesh Ranjan Biswas |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-5-10 |
Journal Detail:
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Title: Letters in applied microbiology Volume: - ISSN: 1472-765X ISO Abbreviation: - Publication Date: 2011 May |
Date Detail:
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Created Date: 2011-5-10 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8510094 Medline TA: Lett Appl Microbiol Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2011 The Society for Applied Microbiology. |
Affiliation:
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Department of Botany, Visva-Bharati, Santiniketan 731 235, West Bengal, India. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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