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Microencapsulation of nisin in alginate-cellulose nanocrystal (CNC) microbeads for prolonged efficacy against Listeria monocytogenes

Huq, Tanzina; Riedl, Bernard; Bouchard, Jean; Salmieri, Stephane; Lacroix, Monique (2014). Microencapsulation of nisin in alginate-cellulose nanocrystal (CNC) microbeads for prolonged efficacy against Listeria monocytogenes Cellulose , vol. 21 , nº 6. p. 4309-4321. DOI: 10.1007/s10570-014-0432-y.

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Résumé

The present study was undertaken to develop edible nisin-microencapsulated beads in order to inhibit growth of Listeria monocytogenes in ready-to-eat (RTE) ham. Different concentrations of nisin (16, 31, and 63 mu g/ml) were microencapsulated into alginate-cellulose nanocrystal beads. Microencapsulation kept the available nisin (63 mu g/ml) content 20 times greater compared with free nisin (63 mu g/ml) during 28 days of storage at 4 A degrees C. Results showed that 63 mu g/ml microencapsulated nisin exhibited 31.26 mu g/ml available nisin content after 28 days of storage at 4 A degrees C, whereas there was no available nisin content left for free nisin. Cooked ham slices were then coated by the microencapsulated nisin beads, inoculated with L. monocytogenes [similar to 3 log colony-forming units (CFU)/g], and stored at 4 A degrees C under vacuum packaging for 28 days. The beads containing 16, 31, and 63 mu g/ml nisin significantly (P a parts per thousand currency sign 0.05) reduced the L. monocytogenes counts by 2.65, 1.50, and 3.04 log CFU/g after 28 days of storage compared with free nisin. Furthermore, microencapsulated nisin beads did not change the physicochemical properties (pH and color) of RTE ham during storage.

Type de document:
Mots-clés libres: Microencapsulation; Nisin; Microbeads; Listeria monocytogenes; RTE; meat; Cellulose; nanocrystals
Centre: Centre INRS-Institut Armand Frappier
Date de dépôt: 31 mai 2017 14:10
Dernière modification: 31 mai 2017 14:17
URI: http://espace.inrs.ca/id/eprint/3056

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