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Aiming at improving the quality of Perna perna mussels cultivated and commercialized in Ubatuba, SP, Brazil, the growth and elimination of Staphylococcus aureus and Bacillus cereus artificially inoculated in mussels were studied. The inoculation was carried out in "in natura" and pre-cooked mussels for 30 min, and after that the mussels were kept for 10 hours at room temperature (25 ± 1 °C) and under refrigeration (7 ± 1 °C). Six thermal treatments were evaluated: three using steam (5, 10 and 15 minutes) and three in boiling water (5, 10 and 15 minutes), in order to find the best time/temperature binomial to provide pathogenic control. Yield and physical-chemical and sensory characteristics were evaluated. All thermal treatments were efficient to eliminate microorganisms in 2 logarithmic cycles. However, the boiling water treatments presented better results than the steam treatments. The physical-chemical and sensory analyses did not show statistical differences among the thermal treatments studied. The best performances were reached in the shortest times of heat exposure. Overall, the treatments in boiling water presented better results than the steam treatments. Buscando a qualidade do mexilhão Perna perna cultivado e comercializado no município de Ubatuba, SP, foram estudados o crescimento e o controle de Staphylococcus aureus e Bacillus cereus inoculados artificialmente em mexilhões in natura e pré-cozidos, mantidos por 10 horas à temperatura ambiente (25 ± 1 °C) e sob refrigeração (7 ± 1 °C). Foram estabelecidos seis tipos de tratamentos térmicos, sendo três sob vapor (5, 10 e 15 minutos) e três por imersão em água (5, 10 e 15 minutos), buscando estabelecer o binômio que proporcionasse a diminuição da contagem microbiana. Posteriormente, foram avaliados o rendimento, os aspectos físico-químicos e sensoriais. Todos os tratamentos térmicos foram eficientes, pois reduziram a contagem microbiana em pelo menos 2 ciclos logarítmicos. Porém, o tratamento térmico por imersão em água com ebulição apresentou resultados melhores que os tratamentos a vapor. As análises físico-químicas e sensoriais não mostraram diferença estatística entre os tratamentos térmicos estudados. Os melhores desempenhos foram alcançados nos menores tempos de exposição ao calor, e os tratamentos em água com ebulição apresentaram resultados mais satisfatórios que os tratamentos a vapor

food science and technology

Quality of mussels cultivated and commercialized in Ubatuba, SP, Brazil: monitoration Bacillus cereus and Staphylococcus aureus growth after post-harvest processing