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In the last years changes occurred in the production process of , a traditional smoked, salted and sometimes ripened ricotta cheese, produced in Sardinia. Fresher, slightly smoked and with reduced salt content products, were introduced into the market to meet changes in consumer's preferences for milder products. The present study of durability was conducted on an innovative fresh and smoked industrial product, also characterized by the small size and the packaging in modified atmosphere. A durability test to assess the evolution of microbiological and physicochemical profile of the product stored at refrigeration (4°C) and mild abuse (7°C) temperatures was carried out. A total of 126 ricotta samples smoked for either 1, 2, or 3 h were analyzed at intervals during shelflife for the determination of aerobic mesophilic counts, , yeast, moulds, ,  spp and . Intrinsic properties, physic-chemical and headspace gas composition were also analyzed. Average and standard deviation were respectively 6,06±0,22 for pH, 0,982±0,05 for a, 74,67%±1,81% for moisture, 10,25%±1,35% for fat, 10,92%±0,46% for protein and 1,70%±0,42% for salt content. Total bacterial count ranged between 3.88±0.48 log cfu/g at T and 3.25±1.02 at T. ,  spp. and  were always below the detection limit.  prevalence (percentage) was 3.17% (2.62±0.42 lg10 cfu/g) and was limited to samples stored longer than 30 days while  was recovered in 5.55% (2.36±0.35 lg10 cfu/g) of the samples and was never observed in samples after 45 days of refrigerated storage. The durability study is preliminary to challenge test to assess the shelf-life of this product in compliance with the requirements of Regulation (EC) 2073/2005.

Microbiological and physicochemical properties of smoked ricotta cheese during refrigeration and temperature abuse storage