| Popis: |
The aim of this study wat to examine the influence of different additive contents for oxygen absorption (5, 10 and 15%) in low-density polyethylene (PELD) plastic foils and storage temperatures (4 and 28oC) on the quality and shelf-life of sliced carrots during storage. Quality and storage-life of packaged carrots slices were determined by observing changes of mass, total carotenoide pigments, microbial counts (mesophilic aerobic bacteria, enterobacteria, sulphitoreducing clostridia, yeast and moulds), sensory quality and texture by the use of penetrometer. The PELD foils modified with 10 and 15% of oxygen absorber (O2, CO2 and N2 permeability at 4oC of around 700 ml m-2d-1atm-1) were the most suitable for the storage and prevention of deterioration of minimally processed carrots. Findings indicated that in these foils the best quality and shelf-life of carrot were maintained by 6 days of storage at 4oC, without significant changes in parameters studied. The absorber for oxygen added to the foil had no influence on the permeability to CO2, O2 and N2. The permeability of foils, which were used for carrot packaging increased by the increase of storage temeprature to 28oC and decreased by decreasing the temperature to 4oC, and was not significantly affected by the additive content either. In the same time the diffusion constants of unused and used PELD foils for carrot packaging at 4oC and 28oC changed according to the change of film permeability during storage at those temepratures. |
