Sistema de apoio à decisão de gerenciamento de risco de Clostridium estertheticum, em matadouro-frigorífico de bovinos
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2011-10-07
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Universidade Federal de Goiás
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Abstract: Blown Pack is a process of spoilage which characterizes by the build-up of gas in the package of chilled meat cuts, causing a repulsing aspect. In Brazil, this spoilage has been described in many States, mainly meat for export, which needs longer shelf-life. The main cause of blown Pack is attributed to Clostridium estertheticum, a bacteria which multiplies easily in long-term storage at refrigeration temperatures and also in anaerobic organisms found in vacuum-packed chilled meat. The management of these bacteria in the flowchart of slaughter is very difficult due to its sporulated shape, easy dissemination and growth during the meat processing. Having said that, this work aimed to propose a decision support system for risk management for Clostridium estertheticum in the flowchart of bovine slaughter and vacuum-packed chilled beef cuts. Hence, it was carried out an identification of Control Point and Critical Point Control for bacteria as well as a risk classification and quantification in the process of vacuum-packed chilled beef cuts. The decision support system was based on the concept of Risk Assessment and Bayesian Networks. The system elaboration was performed at Shell Netica program. The probabilistic was manually input during the meeting with experts on the area. The first proposed structure of the system was elaborated for classification and quantification for microbiological risks, having as a parent node, a Risk Characterization of blown pack. The children nodes, linked to the parent node, were elaborated and based on Risk Exposure and Hazard Characterization for microbial deterioration in blown packed spoilage in meat cuts. In the second part of the proposition of the system, it was selected the slaughter operations and the determining factors of contamination in the processes. The parent nodes indentified the contamination risks and the children nodes the slaughter conditions. The system performance was assessed by specificity and sensibility. The proposed model presented a satisfactory performance, being reliable to the productive reality. The system presented high risk for blown pack for C. estertheticum, lactic acid bacteria and Enterobacteriaceae. Concerning its performance in identifying the contamination risk on the flowchart of slaughter, it has been high, with 100% of specificity and sensibility. The proposed model presented clear diagnosis, showing the operations that need more attention by the risk manager‟s part.
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MELO, Camila Silveira de. Decision support system for risk management for Clostridium estertheticum bovine slaughterhouses. 2011. 122 f. Tese (Doutorado em Ciências Agrárias) - Universidade Federal de Goiás, Goiânia, 2011.