Application of low density polyethylene films [electronic resource]: 2. their effect on the refrigerated storage stability of vacl!um packaged cold-smoked herring

Includes reference.

The present investigation was carried out to assess effect of feasibility of using some various packaging materials, i.e. untreated & treated low density po!yethylene (lOPE) films, of 180 mierens thickness, with potassium sorbet,;, or calcium propionate (at the concentrations of 2 ar.d 4% w/w). and polyamide/polyethylene (PAlPE) film.The study was focused on the effect of these packaging materials on the physicochemical (i.e. water holding capacity, total volatile bases nitrogen, trimethylamine nitrogen, biogenic amines such as histamine, putrescine, cadaverine, tyramine, tryptamine and B-phenylethylamine), thiobarbituric acid value and pH value),microbiological quality (i.e. total aerobic counts and pyschrophilic bacterial counts)1Ind sensory attributes (i.e. flavor, texture and overall acceptability) changes during refrigerated storage (5,:tZOC) of vacuum packaged cold-smoked herring (Clupaa he_gus). ’Resuns indicated that among the used treatments, vacuum packaged coldsmoked herring samples in LOPE fitms con1aining either po1assium sorbate or calcium propionate at the concentration of 4% were found to be superior in most aspects and effective in extending their shelf•life (unaccepted alter 12 wk). Following it, those samples of cold•smoked herring packaged in lOPE films with 2% potassium sorbate or calcium propionate which were unaccepted alter 10 wk). On the other hand, samples of vacuum packaged in LOPE film and PAiPE film demonstrated major changes in most quality attributes that were obviously observed, being unacceptable alter 8 wk of storage at 5,:t2°C. Finally, using the antimicrobial low density polyethylene films containing 2% and 4% potassium sorbate or calcium propionate could be recommended for packaging vacuum cold-smoked herring. Such packaging would only be affected for keeping the quality attributes of the product but also could extended its shelf-life.

Summary in Arabic.

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