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TitleShelf life extension of Ricotta cheese using coatings of galactomannans from nonconventional sources incorporating nisin against Listeria monocytogenes
Author(s)Martins, Joana
Cerqueira, M. A.
Souza, B. W. S.
Avides, Maria do Carmo
Vicente, A. A.
KeywordsShelf life
Ricotta cheese
Edible coating
Listeria monocytogenes
Rlcotta cheese
Issue dateFeb-2010
PublisherAmerican Chemical Society
JournalJournal of Agricultural and Food Chemistry
Citation"Journal of Agricultural and Food Chemistry". ISSN 0021-8561. 58:3 (2010) 1884–1891.
Abstract(s)Shelf life extension of Ricotta cheese was evaluated at 4 °C upon the use of edible coatings made of galactomannans from Gleditsia triacanthos incorporating nisin against Listeria monocytogenes. Three different treatments were tested in cheese: samples without coating; samples with coating without nisin; and samples with coating containing 50 IU·g−1 of nisin. To test the effectiveness of the treatments against L. monocytogenes, the surface of the cheese was inoculated with a suspension of the microorganism. Microbiological and physical−chemical analyses of the cheese samples were performed during 28 days. Results showed that the cheese coated with nisin-added galactomannan film was the treatment presenting the best results in terms of microbial growth delay (p < 0.05). The addition of nisin also affects (p < 0.05) the physical and mechanical properties of the films: O2 permeability decreased from 1.84 to 1.35 × 10−12 cm3·(Pa·s·m)−1; CO2 permeability increased from 1.96 to 6.31 × 10−12 cm3·(Pa·s·m)−1; opacity increased from 3.68 to 4.59%; tensile strength ranged from 0.84 to 1.46 MPa; and elongation at break improved from 50.93 to 68.16%. These results demonstrate that novel galactomannan-based edible coatings, when combined with nisin, may provide consumer-friendly alternatives to reduce L. monocytogenes postcontamination on cheese products during storage.
Publisher version
AccessOpen access
Appears in Collections:CEB - Publicações em Revistas/Séries Internacionais / Publications in International Journals/Series

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