Estimation of the shelf-life of Halloumi cheese using survival analysis
2012
Kamleh, R., American Univ. of Beirut (Lebanon). Dept. of Environmental Health | Toufeili, I., American Univ. of Beirut (Lebanon). Dept. of Nutrition and Food Sciences | Ajib, R., American Univ. of Beirut (Lebanon). Dept. of Environmental Health | Kanso, B., American Univ. of Beirut (Lebanon). Dept. of Environmental Health | Haddad, J., Notre Dame Univ., Zouk Mosbeh (Lebanon). Dept. of Mathematics and Statistics
Halloumi cheese blocks, packaged in vacuum polyamide/polyethylene laminate bags, were stored at 5, 15, and 25 deg C. The changes in total bacterial count, lactic acid bacteria, total anaerobic bacteria, yeasts and molds, pH, and titratable acidity were monitored during the storage. The appearance of the packaged Halloumi cheese exhibited significant correlations with the counts of the different microbial populations inhabiting the cheese. The shelf-life of the stored Halloumi cheese was determined using survival analysis and considering consumer rejection as a failure index. The nominal shelf-lives of Halloumi cheese were 79.6, 37.8, and 2.6 days when stored at 5, 15, and 25 deg C, respectively. The Q10 values (shelf-life at T deg C/shelf-life at T + 10 deg C) at 5 deg C and 15 deg C were 2.1 and 14.5, respectively. The increase in the counts of different microbial populations during storage highlights the need for adherence to good manufacturing practices and maintenance of low temperatures during the storage and distribution of the packaged Halloumi cheese.
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