Ação de absorvedores de etileno e de oxigênio na conservação pós-colheita de morango / Action of ethylene and oxygen absorbers on postharvest strawberry conservation
AUTOR(ES)
Patrícia Souza de Oliveira
FONTE
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia
DATA DE PUBLICAÇÃO
23/02/2011
RESUMO
The present work aimed to study the influence of the PVC (polyvinyl chloride) film of different concentrations of KMnO4 (ethylene absorbent) and the oxygen absorber sachet (O-Buster) on the quality and postharvest conservation of Oso Grande strawberries. In order to achieve this physical-chemical, enzymatic and visual analyses were performed every 2 days on fruits stored for 14 days at 4 C. The presence of PVC was essential to maintain the visual characteristics and reduction of weight loss of the fruits during the storage period. The fruits treated with different doses of KMnO4 (1, 2, 3 and 4 g) generally showed similar behavior to the fruits of the control treatment with PVC film, which kept the values of titratable total acidity (TTA), increased the total soluble sugars (TSS) and decreased the reducing sugars (RS) at 14 days of storage. The activity of the polyphenol oxidase (PPO), peroxidase (POD) and alcohol dehydrogenase (ADH) enzymes decreased in fruits stored with KMnO4 sachets, however, regarding to ADH and the fruits treated with KMnO4 differed from the fruits of the control treatment with PVC. There was accumulation of ethanol in the fruits of the treatments used at the end of storage. The dosage of 1 g of KMnO4 (T3) was effective in delaying the visible growth of fungi in fruits stored for 14 days, contaminated fruits could only be seen in the last day of storage. The treatments with sachets of oxygen and ethylene had synergistic effect on the fruits that were stored for 14 days. The combination of the two absorbers kept the values of ATT, the PPO and ADH enzyme activity, and increased the AST in the fruits. In the remaining variables, the treatments with oxygen and ethylene absorbers and the combination of both in the same package of PVC did not differ among themselves and have retained the values of AR and the POD activity, and accumulated a small quantity of ethanol in the fruits at the end of storage. The combination of oxygen and ethylene absorbing sachets was effective in delaying the visible growth of fungi within 12 days of storage. The best way preserve strawberries, according to the results, was the storage in packages containing oxygen and ethylene absorbing sachets, sealed with PVC film and stored at 4 C for 12 days.
ASSUNTO(S)
conservação absorvedor de oxigênio permanganato de potássio fragaria x ananassa duch. fisiologia vegetal fragaria x ananassa duch. potassium permanganate oxygen absorbers conservation
