Evaluation of Ethanol and Sulfur Dioxide Pad Effects on Quality Parameters of Stored Table Grapes

Abstract

Postharvest loses of table grapes are mainly caused berry decay or desiccation of stem and pedicels. It can be slow down or stop these problems by generator pads containing metabisulfite salt, then packing of the fruits in polyethylene liners. Metabisulfite salts are the compounds which slow release SO₂ by the humidity. However, high levels can result in fruit damage or some allergies on human health. Red globe grape variety that has increased growing trend recently, in Mediterranean region was used in this studies. Bunches were sorted after harvest and divided for three treatment as (a) Packed into 0.05 mm thickness plastic film (b) Forced air cooled, packed into 0.05 mm thickness plastic film and sodium metabisulfate paper pads were placed on top of the bunches (c) Bunches were dipped 35 % ethanol solutions + 2 % citric acid concentration for 1 min, packed into 0.05 mm thickness plastic film. After all these treatments bunches that packed into plastic film were arranged in carton boxes and stored at 0 ºC, 85-90 % RH for 4 month. This study showed that Red Globe grape variety can be stored successfully up to 4 month.