Journal
CARBOHYDRATE POLYMERS
Volume 81, Issue 2, Pages 219-225Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2010.02.021
Keywords
Carbohydrate edible coating; HPMC; Polypeptide nisin; Biodegradable packaging; Listeria
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Bioactive composite coatings based on hydroxypropyl methylcellulose (HPMC), broad-spectrum food preservative nisin (Nisaplin (R)), and hydrophilic plasticizer glycerol were evaluated for mechanical, barrier (O-2, H2O), transparency and microbiological effectiveness. Incorporation of Nisaplin (R) into cellulose derivative, i.e. HPMC-based films strongly increased the film thickness due to salt crystallization while glycerol had normalized it by homogenous dispersibility. The tensile strength of composite films decreased, however ultimate elongation was increased significantly. The dynamic vapour sorption experimental data fitted by different models had shown lesser values of respective energy constants for composite films. The transparency and water permeability of HPMC films were negatively affected by the additives as an effect individual but conversely as combined effect for film transparency. Film bioactivity demonstrated efficacy against Listeria > Enterococcus > Staphylococcus > Bacillus spp. These cellulose derivative based active films may thus be a key approach towards eradicating post-process contamination of healthy foods. (C) 2010 Elsevier Ltd. All rights reserved.
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