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Integração de tratamentos pós-colheita físicos (calor e ultrassons) e biocontrolo na conservação de pera Rocha inteira e na aptidão para processamento

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Resumo:The integrated effects of heat treatments, ultrasound and biocontrol (Blossom Protect™) were evaluated as alternatives to postharvest storage of Rocha pear and to the production of fresh-cut pear. Based on response surface methodology to assess thermal binomials decontamination efficiency, the 40 ºC / 40 min condition (Top - immersion the pears in water) was selected due to the achieved reduction level (~1 and ~2 LogCFU.g-1 to aerobic microorganisms and yeast and molds, respectively) without changing the fresh characteristics. Ultrasound application had a non-significant effect in reducing fruits contaminating flora and didn’t introduced further decontamination effects when combined with Top, confirming Top single application effectiveness. During fruit postharvest storage (7 ºC, 60 days), the effects of the combination of heat treatment and biocontrol were surpassed by Top single application since the later proved to be more effective in achieving significant decontamination levels and to control rot development. Regarding the use of Top as an alternative treatment to the standard use of sodium hypochlorite as a decontamination agent, has shown potential in decontamination, effective control of microbial development and color maintenance of the fresh-cut pear during storage (5 ºC, 15 days) suggest that Top is a viable alternative to this production
Autores principais:Coelho, Duarte Francisco Pequeno
Assunto:Rocha pear storage heat treatment ultrasound biocontrol minimal processing
Ano:2015
País:Portugal
Tipo de documento:dissertação de mestrado
Tipo de acesso:acesso aberto
Instituição associada:Universidade de Lisboa
Idioma:português
Origem:Repositório da Universidade de Lisboa

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