Métodos combinados para preservar a qualidade pós-colheita do mamão Goldentipo exportação / Hurdle technology to preserve the Goldenpapaya postharvest quality

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

With the purpose of evaluating a combination of postharvest techniques on papaya Golden storage, the following treatments were investigated: carton boxes packaging (CP); CP + plastic bag of PEBD - low density polyethylene film, with 0.05mm of thickness (PE); CP + PEBD with 0.025mm of thickness impregnated with mineral ethylene scavenger (PEAbs); y-irradiation (0.4 kGy and 0.7 kGy); and refrigerated storage at 10°C e 90% of relative humidity for 2, 5, 10, 15, 20, 25, 30 and 35 days plus five days under environmental conditions to allow ripening and to simulate the product marketing. To evaluate the effects on fruit quality the following measurements were taken: - first experiment, disease incidence, skin color and loss of turgidity (as visual variables); skin and flesh color, weight loss, flesh firmness, total soluble solids, total titratable acidity, pH, lycopene and beta-carotene composition; - second experiment, sensorial analysis on samples submitted to the treatments with better results from the first experiment. Posharvest diseases were the main factor responsible for discarding fruits. Percentage of weight loss was higher on papayas stored without plastic packaging. Time affected the flesh firmness (F = 95%). However, there wasnt influence of the treatments on that parameter. A significant effect on skin color was observed with interaction between irradiation (0.4 and 0.7 kGy) and storage period. Once reached the edible stage, irradiated papayas presented more uniformity on skin color. For beta-carotene and Lycopene, the mean values were 1.27 to 1.79 and 19.16 to 23.90 müg/ml of flesh, respectively. But those substances werent affected by the combined methods or the time. The same behavior were observed for total soluble solids, total titratable acidity and pH (mean values of 11.53 to 12.20 °Brix, 0.117 to 0.136 g of citric acid/100g of flesh and 4.91 to 5.04, respectively). On sensory evaluation, the judges didnt get to detect significant differences among papayas submitted to different treatments. A synergism was verified on the techniques combination, with the best results obtained from the association of CP + PEabs + y-irradiation at 0.4 kGy, which reached a total storage period of 35 days. Thus, that is the posharvest hurdle technology recommend for exporting Goldenpapayas to markets with quarantine restrictions to fruit-flies

ASSUNTO(S)

postharvest pós-colheita y irradiation carica papaya carica papaya embalagem armazenamento storage packaging irradiação y

ACESSO AO ARTIGO

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