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Effects of nisin, EDTA and salts of organic acids on Listeria monocytogenes, Salmonella and native microflora on fresh vacuum packaged shrimps stored at 4 °C

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Wan Norhana, M. N., Poole, S., Deeth, H. C. and Dykes, G. A. (2012) Effects of nisin, EDTA and salts of organic acids on Listeria monocytogenes, Salmonella and native microflora on fresh vacuum packaged shrimps stored at 4 °C. Food Microbiology, 31 (1). pp. 43-50.

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Article Link: https://doi.org/10.1016/j.fm.2012.01.007

Abstract

Nisin (500 IU ml -1), EDTA (0.02 M), potassium sorbate (PS) (3%, w/v), sodium benzoate (SB) (3%, w/v) or sodium diacetate (SD) (3%, w/v); alone or in combination were used to dip uninoculated shrimps and shrimps inoculated with Listeria monocytogenes or Salmonella (~4.0-5.0 log CFU g -1). Shrimps were then drip-dried, vacuum packaged and stored at 4 °C for 7 days. Untreated shrimps were used as a control. Numbers of L. monocytogenes, Salmonella and native background microflora were determined on uninoculated and inoculated shrimps on days 0, 3 and 7. Nisin-EDTA-PS and nisin-EDTA-SD significantly reduced (p < 0.05) L. monocytogenes numbers by 1.07-1.27 and 1.32-1.36 log CFU g -1, respectively, on day 0 and 3. However, all treatments failed to significantly reduce (p > 0.05) Salmonella counts on shrimps throughout storage. On day 7, numbers of aerobic bacteria, psychrotrophic bacteria and Pseudomonas on combined nisin-EDTA-salt of organic acids treated shrimps were significantly lower (p < 0.05) by 4.40-4.60, 3.50-4.01, and 3.84-3.99 log CFU g -1 respectively, as compared to the control. Dipping in organic acids solutions followed by vacuum packaging and chilled storage can help reduce L. monocytogenes and native microflora, but not Salmonella, on fresh shrimps. © 2012 Elsevier Ltd.

Item Type:Article
Corporate Creators:Department of Agriculture and Fisheries, Queensland
Business groups:Crop and Food Science
Keywords:Antimicrobials GRAS Listeria Salmonella Shrimps Animals Colony Count, Microbial Consumer Product Safety Edetic Acid Food Contamination Food Microbiology Food Packaging Food Preservatives Food Storage Listeria monocytogenes Nisin Penaeidae Refrigeration Salts Seafood Sorbic Acid Vacuum Bacteria (microorganisms) Decapoda (Crustacea) Pseudomonas food preservative inorganic salt animal article bacterial count drug effect food control freezing growth, development and aging methodology microbiology product safety sea food
Subjects:Aquaculture and Fisheries > Fisheries > Fishery research
Aquaculture and Fisheries > Fisheries > Packing, transportation and storage
Aquaculture and Fisheries > Fisheries > Shellfish fisheries
Aquaculture and Fisheries > Seafood gathering
Live Archive:13 Feb 2024 05:09
Last Modified:13 Feb 2024 05:09

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