Tecnologia de Alimentos
URI permanente desta comunidadehttps://locus.ufv.br/handle/123456789/11783
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Resultados da Pesquisa
Item Desenvolvimento e avaliação de filme antimicrobiano aromatizado para aplicação em massa de pastel(Ciência Rural, 2011-03) Moraes, Allan Robledo Fialho e; Vidigal, Márcia Cristina Teixeira Ribeiro; Soares, Nilda de Fátima Ferreira; Moraes, Luana Pereira de; Melo, Nathália Ramos de; Gonçalves, Maria Paula JunqueiraA indústria de alimentos, buscando atender à crescente demanda dos consumidores, vem desenvolvendo embalagens ativas para proporcionar qualidade e segurança aos produtos acondicionados. Este trabalho objetivou desenvolver e avaliar a aplicação de filmes ativos aromatizados em contato com a massa de pastel. Os filmes foram preparados pelo método casting, adicionados de ácido sórbico e aroma de pizza e avaliados in vitro frente ao microrganismo Penicillium sp. Também foram estudadas suas propriedades mecânicas, migração de ácido sórbico, avaliação sensorial do produto e análise microbiológica in vivo. Os filmes ativos apresentaram atividade antimicrobiana tanto in vitro como no alimento. A caracterização mecânica mostrou que os filmes ativos aromatizados apresentaram valores de carga máxima na ruptura, inferiores ao filme controle e, durante a migração, a adição de aroma contribuiu para uma maior liberação do ácido sórbico. Além disso, as massas de pastel em contato com os filmes ativos aromatizados apresentaram melhores resultados sensoriais.Item Packaging properties and control of Listeria monocytogenes in bologna by cellulosic films incorporated with pediocin(Brazilian Journal of Food Technology, 2013-08-29) Espitia, Paula Judith Pérez; Pacheco, Jhon Jairo Reina; Melo, Nathália Ramos de; Soares, Nilda de Fátima Ferreira; Durango, Alba ManuelaListeria monocytogenes is a foodborne pathogen, able to survive and proliferate at refrigeration temperatures. As a result, ready-to-eat meat products have been associated with major outbreaks. Producing meat products involves lethal preservation treatments, e.g. thermal treatments. Listeria contamination, however, may be introduced when products are sliced and packaged at retail businesses or delicatessens. In Brazil, sliced bologna is very popular at retail markets. After slicing, however, bologna has a short shelf-life. The aim of this work was to study the effects of pediocin incorporation on the load at break, water vapor permeability rate and structure, by microscopic analysis, of antimicrobial cellulosic packaging. The potential application of the developed packaging for the preservation of bologna and inhibition of Listeria biofilm formation was also studied. Cellulosic antimicrobial packaging films were produced with cellulose acetate and acetone. Pediocin (commercially available concentrate ALTATM 2341) was incorporated at 30, 40 and 50 % w/w. The load at break of films was studied using the Universal Testing Machine (Instron) at 10 °C and 25 °C. The water vapor permeability was determined by gravimetric method. A scanning electron microscope was used to study the developed packaging structure. Antimicrobial activity of films against Listeria innoucua and L. monocytogenes was tested both in vitro and in bologna samples. Results showed that values of load at break decreased with increasing concentrations of pediocin at 10 °C and 25 °C. Regarding water vapor permeability, only the control and 50 % pediocin films presented statistical difference, with the 50 % pediocin film being more permeable. In vitro tests showed antimicrobial activity against L. innocua. Cellulosic film with 50 % pediocin reduced L. monocytogenes growth on sliced bologna by 1.2 log cycles after 9 days and prevented biofilm formation on packaging and bologna surfaces. Hence, active cellulosic films made with 50 % pediocin in the form of commercially available concentrated ALTATM 2341 have the potential of being used in a system of hurdle technologies as a final obstacle for L. monocytogenes control in bologna preservation.