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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Tratamentos físicos em pós-colheita de atemoia 'Thompson' /

Vieira, Geraldo Henrique Martins, 1963. January 2018 (has links)
Orientador: Rogério Lopes Vieites / Banca: Nobuyoshi Narita / Banca: Angela Vacaro de Souza / Banca: Silvia Antoniali do Carmo / Banca: Gisela Ferreira / Resumo: Este trabalho, objetiva estudar a atemoia, cultivar 'Thompson', em três diferentes tratamentos de pós-colheita: uso de ácidos orgânicos, atmosfera modificada ativa e irradiação ionizante (60Co). Os frutos foram selecionados e armazenados em câmara fria nas condições de 15 ± 0,2ºC e 90 ± 2% de UR. Para cada experimento houve três repetições e dois frutos por repetição. Foram seis tratamentos realizados, sendo dois ácidos orgânicos (ascórbico e cítrico); nas concentrações de 1%, 2% e 3% cada tratamento submerso em sua solução de ácido orgânico por 10 minutos e posteriormente seca à sombra. Na atmosfera modificada ativa, foram quatro tratamentos, sendo eles: T0 - 21% de O2, 0,03% CO2 e 78% de N2 (ambiente);T1 - 4% de O2, 5% CO2 e 91% de N2, T2 - 4% de O2, 6% CO2 e 90% de N2, T3 - 4% de O2, 7% CO2 e 89% de N2 e T4 - 4% de O2, 8% CO2 e 88% de N2. No experimento de irradiação ionizante (60Co), foram utilizados os tratamentos T0= Sem irradiação (controle), T1=0,2kGy, T2=0,4kGy, T3=0,6kGy, T4=0,8kGy, T5=1,0kGy e T6= 1,2kGy. Em todos os comparativos de todos os experimentos as amostras foram analisadas a cada três dias até dezoito dias de armazenamento. No tratamento controle os frutos foram lavados em água corrente e posteriormente imersos em solução clorada a 150 mg L-1, por 10 minutos e posteriormente secos à temperatura ambiente; exceção feita ao tratamento controle de irradiação ionizante, o qual não recebeu este tratamento. Em todos os tratamentos, foram realizadas as análises: ... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: This work aims to study atemoia, 'Thompson' cultivar, in three different post-harvest treatments: use of organic acids, active modified atmosphere and ionizing irradiation ( 60Co). The fruits were selected and stored in a cold room under conditions of 15 ± 0.2°C and 90 ± 2% RH. For each experiment there were three replicates and two fruits per replicate. Six treatments were carried out, being two organic acids (ascorbic and citric); at concentrations of 1%, 2% and 3% each treatment submerged in its organic acid solution for 10 minutes and then dried in the shade. In the active modified atmosphere, there were four treatments, being them T0 - 21% O2, 0.03% CO2 and 78% N2 (environment), T1 - 4% O2, 5% CO2 and 91% N2, T2 - 4 % of O2, 6% CO2 and 90% N2, T3 - 4% O2, 7% CO2 and 89% N2 and T4 - 4% O2, 8% CO2 and 88% N2. In the experiment of ionizing irradiation (60Co), the treatments T0 = Without irradiation (control), T1 = 0.2kGy, T2 = 0.4kGy, T3 = 0.6kGy, T4 = 0.8kGy, T5 = 1.0kGy and T6 = 1.2kGy. In all comparisons of all experiments the samples were analyzed every 3 (three) days to 18 (eighteen) days of storage. In the control treatment the fruits were washed in running water and then immersed in chlorinated solution at 150 mg L-1 for 10 minutes and then dried at room temperature; exception to the control treatment of ionizing radiation, which did not receive this treatment. In all treatments, the analyzes were: peeling and pulp chromatography, fresh mass loss, soluble solids (SS), titratable acidity (TA), pH, ascorbic acid (AA), reducing sugars, respiratory rate, specific activity of polyphenol-oxidase (PPO) and peroxidase (POD), total antioxidant activity and total phenolic compounds. The experiments were conducted in a completely randomized design (D.I.C.), in a factorial scheme (treatment x storage), composed by the treatments of the different experiments and eight storage times. The results ... / Doutor

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