Articles

Heat treatment prevents the appearance of chilling symptoms in okra

Article number
1194_67
Pages
463 – 468
Language
English
Abstract
The aim of this study was to determine the efficiency of hot water treatment to prevent chilling induced browning in okra (Abelmoschus esculentus). Okra fruit ‘Amarelinho’ and ‘Mammoth Spineless’ were immersed in hot water at 40°C for 15 or 30 min, or left untreated (control). Afterwards, the fruit were stored at 10°C simulating shipping conditions.
Visual analysis, total chlorophyll content and the content of phenolic compounds were evaluated.
In addition, the relationship between the activity of catalase and the appearance of chilling injury, as well as the relationship between peroxidase and polyphenoloxidase with enzymatic tissue browning were determined.
The longest shelf-life period was achieved when the fruit were treated for 30 min at 40°C. Total pericarp chlorophyll decreased linearly with the length of storage and with the increase of heat treatment in both cultivars.
Longer period of storage led to greater concentration of total phenolic compounds in the fruits of both cultivars.
The appearance of chilling injury symptoms was not coincident with increase in catalase activity.
No relationship was found between the increase in skin browning and polyphenol oxidase and peroxidase activity.
Based on the results, skin browning seems to develop by non-enzymatic reactions.

Publication
Authors
T.P. Silva, F.C. Silva, L.L.M. Neves, F.L. Finger
Keywords
Abelmoschus esculentus, catalase, peroxidase, polyphenol oxidase, heat treatment
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