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Application of freshness indicator for monitoring of fish spoilage in model and commercial packaging

Key words: 

food freshness indicator, intelligent packaging, storage of fresh fish


Food safety and quality are a key problem in the food industry, especially for fish and fishery products. Freshness and quality of fish and fishery products can be assessed by various method. Unfortunately many of them are time-consuming, require expensive equipment or employ qualified staff. This causes that they cannot be used for fast indicative analyses. An ideal method to monitor packaged raw fish appears to be so-called intelligent packaging.  The aim of this study was to develop and evaluate a freshness indicator designed to monitor changes in the freshness of packed fish. The following chemical compounds were used to create the indicator: methyl red (MR) and bromothymol blue (BB) as pH sensitive dyes, selected humectant: PEG9, PEG34 or glycerol and sodium carboxymethyl cellulose. Hydrochloric acid were used to adjust an appropriate pH of freshness indicator. The proposed freshness indicator was able to monitor the quality of raw fish in real time. One of the most important factors in the indicator preparation seems to be the moisture content in its composition which influenced the  indicator reactivity to volatile substances. Factors that influence the indicator activity include also the circumstances and parameters of its application in intelligent package.  It was shown that the response of the indicator strongly depends on the proper location in the packaging space and the distance to the monitored fish sample. At the last stage, the studied freshness indicator activity was correlated with sensory properties of stored food and with the scale of its microbial contamination. 

dr hab. inż. Ryszard CIERPISZEWSKI, prof. nadzw. UEP

dr inż. Mariusz TICHONIUK

mgr inż. Natalia RADOMSKA

Poznań University of Economics and Business

Faculty of Commodity Science Department of Industrial Products Quality and Ecology

Aleja Niepodleglosci 10, 61-875 Poznań, Poland

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