ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Effects of TiO2 photocatalytic oxidation in the room atmosphere and the quality of tomato fruit during storage under a closed system

T. Nishizawa, M. Takeda, H. Murayama, U. Matsushima

ISHS Acta Horticulturae804:309-314. 2008.

2008

บทคัดย่อ

Fruits that are stored in closed storage rooms during transport often lose their quality rapidly not o­nly by ethylene gas accumulating in the room but also by accelerated fermentation, which is caused by anaerobic conditions. In this study, green-mature tomato fruits were stored in closed chambers, and the effects of photocatalytic oxidation by titanium-dioxide (TiO₂) o­n the maintenance of fruit quality and changes in the gas environment in the chambers were investigated. Ethylene and CO₂ concentrations in the untreated chamber (without TiO₂ photocatalyst) increased rapidly during storage, while those in the treatment chamber (with TiO₂ photocatalyst) increased gradually, reaching approximately 30% of the levels of the untreated chamber at the end of storage period. When tomato fruits were stored at 15°C for 17 days, fruit firmness did not differ significantly between the treatments, while green skin colour was maintained o­nly in the treated fruits. Both the citric and malic acid concentrations in the pulps and loculi of treated fruit were significantly higher than those of untreated tomatoes. Conversely, both the acetaldehyde and ethanol concentrations of treated tomatoes were significantly lower than those of untreated fruit. Both the glucose and fructose concentrations in the pulps of treated tomatoes were significantly higher than those of untreated fruit, but those in the loculi of treated fruit were significantly lower than those of untreated tomatoes. Our results show that TiO₂ photocatalytic oxidation is a useful technique not o­nly to reduce ethylene and CO₂ gases in the storage room but also to maintain the fruit quality of green-mature tomato fruits.

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