title: Use of antimicrobial films and edible coatings incorporating chemical and biological preservatives to control growth of Listeria monocytogenes on cold smoked salmon.
abstract: The relatively high incidence of Listeria monocytogenes in cold smoked salmon (CSS) is of concern as it is a refrigerated processed food of extended durability (REPFED). The objectives of this study were to compare and optimize the antimicrobial effectiveness of films and coatings incorporating nisin (Nis) and sodium lactate (SL), sodium diacetate (SD), potassium sorbate (PS), and/or sodium benzoate (SB) in binary or ternary combinations on CSS. Surface treatments incorporating Nis (25000 IU/mL) in combination with PS (0.3%) and SB (0.1%) had the highest inhibitory activity, reducing the population of L. monocytogenes by a maximum of 3.3 log CFU/cm(2) (films) and 2.9 log CFU/cm(2) (coatings) relative to control samples after 10 days of storage at 21°C. During refrigerated storage, coatings were more effective in inhibiting growth of L. monocytogenes than their film counterparts. Cellulose-based coatings incorporating Nis, PS, and SB reduced the population of L. monocytogenes, and anaerobic and aerobic spoilage flora by a maximum of 4.2, 4.8, and 4.9 log CFU/cm(2), respectively, after 4 weeks of refrigerated storage. This study highlights the effectiveness of cellulose-based edible coatings incorporating generally regarded as safe (GRAS) natural and chemical antimicrobials to inhibit the development of L. monocytogenes and spoilage microflora thus enhancing the safety and quality of CSS.
authors.affiliation: Department of Agriculture and Food Science, Faculty of Agriculture, University of Mauritius, Mauritius.
authors.forename: Hudaa
authors.identifier: 0000-0002-5513-8539
authors.initials: H
authors.lastname: Neetoo
authors.affiliation: Department of Health Sciences, Faculty of Science, University of Mauritius, Mauritius.
authors.forename: Fawzi
authors.initials: F
authors.lastname: Mahomoodally
mesh_terms: D000818:Animals; D000890:Anti-Infective Agents / Q000737:chemistry / Q000494:pharmacology*; D002470:Cell Survival / Q000187:drug effects; D020099:Coated Materials, Biocompatible / Q000737:chemistry / Q000494:pharmacology; D003080:Cold Temperature; D005506:Food Contamination / Q000032:analysis / Q000517:prevention & control*; D018857:Food Packaging / Q000379:methods; D005519:Food Preservation / Q000379:methods*; D005520:Food Preservatives / Q000737:chemistry / Q000494:pharmacology*; D057141:Food, Preserved / Q000382:microbiology; D008089:Listeria monocytogenes / Q000187:drug effects* / Q000302:isolation & purification; D008567:Membranes, Artificial; D012474:Salmon / Q000382:microbiology*
chemical_list: D000890:Anti-Infective Agents; D020099:Coated Materials, Biocompatible; D005520:Food Preservatives; D008567:Membranes, Artificial
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