Browsing by Author "Matos, T. J. S."
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- Application of unsteady-state heat transfer equations to thermal process of morcela de arroz from Monchique region, a portuguese traditional blood sausagePublication . Pereira, Jorge; Ferreira-Dias, S.; Dionísio, Lídia; Patarata, L.; Matos, T. J. S.Morcela de Arroz (MA) is a popular cooked blood and rice sausage produced following empirical procedures in the Monchique region, south of Portugal. Presenting high pH (about 6.5) and water activity (around 0.97), it is commercialized without preservatives, unpacked and with restricted commercialization period (1 week at 0C-5C). The aim of this study was (i) to assess the adequacy of unsteady-state heat transfer equations (USHTE) using Heisler charts to predict temperature in the centre of the product and the time needed to attain the temperature needed for cooking and (ii) to determine if the thermal treatment traditionally applied complies with the recommendations for refrigerated processed foods of extended durability (REPFEDs). A very good fit of USHTE to the experimental time/temperature data was observed. MA thermal process complies with the REPFEDs recommendations. Bacillus cereus and Clostridium perfringens were not detected in any of the tested samples.
- Effect of packaging technology on microbiological and sensory quality of a cooked blood sausage, Morcela de Arroz, from Monchique region of PortugalPublication . Pereira, J; Dionísio, Lídia; Patarata, L.; Matos, T. J. S.Morcela de Arroz (MA), a popular Portuguese blood sausage, with high pH and water activity (a(w)), is traditionally commercialized without preservatives and unpacked. This study evaluated the best packaging solution to extend MA shelf life stored at 4 +/- 1 degrees C for 44 days: without packaging (WP), vacuum (VP) and modified atmosphere packaging (MAP) (80% CO2; 20% N-2). Mesophilic (MTVC), psychrotrophic (PTVC), lactic acid bacteria (LAB), pseudomonads, molds and yeasts, Enterobacteriaceae, Listeria monocytogenes, Salmonella spp., Bacillus cereus, Clostridium perfringens, sensory properties, pH, moisture and aw were studied. Moisture and a(w) decreased (p < 0.05) in WP. pH decreased in WP and MAP during storage. MTVC and PTVC counts increased to values around 7 log CFU/g at 44 days of storage. LAB and Enterobacteriaceae counts were higher (p < 0.05) in VP. Pseudomonads were inhibited (p < 0.05) by MAP after 8 days of storage. Sensory parameters were affected (p < 0.05) by packaging and storage time. Globally, MAP performed better. (C) 2014 Elsevier Ltd. All rights reserved.