Quality evaluation of fresh-cut 'Pérola' pineapple stored in controlled atmosphere Ciência e Tecnologia de Alimentos Quality evaluation of fresh-cut 'Pérola' pineapple stored in controlled atmosphere Avaliação da qualidade do abacaxi 'Pérola' minimamente

Abstract

Abstract The purpose of this research was to determine the best gas mixture in controlled atmosphere conditions to store fresh-cut 'Pérola' pineapple, particularly in relation to the maintenance of visual quality and reduction of microbial growth. After sanitation, fruit was manually peeled, sliced and dipped in 20 mg.L -1 NaOCl solution for 30 seconds. Then, the excess liquid was drained and the slices were placed in sealed glass jars connected to a flowboard installed in a cold room (5 1 °C). Desired gas mixtures were supplied continuously for 12 days from cylinders connected to the flowboard. Controlled atmospheres of 2:5, 2:10, 2: 15, 5:5, 5:10, 5:15, 8:5, 8:10 and 8:15 (O 2 :CO 2 , %) and air were used. The product was evaluated for pulp color, total and fecal coliforms, mesophilic and psychrotrophic aerobic, mold and yeast counts. Total and fecal coliforms were not detected. The fresh-cut 'Pérola' pineapple was not very sensitive to storage in controlled atmosphere, considering that the slices had little browning and were free of contamination, that would affect the food safety at the end of the storage period. Keywords: Ananas comosus; minimal processing; gas mixture; quality; microbial growth. Resumo Procurou-se determinar a composição gasosa ótima para o armazenamento do abacaxi 'Pérola' minimamente processado, particularmente com relação à melhoria da qualidade visual e à redução do crescimento microbiano. Frutos previamente sanitizados foram descascados e fatiados manualmente. As fatias foram imersas em solução de NaOCl 20 mg.L -1 durante 30 segundos. Após período de repouso, para drenagem do excesso de líquido, foram acondicionadas em frascos de vidro herméticos conectados a um fluxcentro instalado em câmara refrigerada a 5 1 °C. As composições gasosas desejadas foram fornecidas continuamente, durante 12 dias, a partir de cilindros conectados ao fluxcentro