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Boonkorn P.,Chiang Mai University | Boonkorn P.,Postharvest Technology Research Institute | Gemma H.,University of Tsukuba | Sugaya S.,University of Tsukuba | And 5 more authors.
Postharvest Biology and Technology | Year: 2012

The effects of gaseous ozone on the growth of green mold (Penicillium digitatum) and the activity of antioxidant enzymes (superoxide dismutase, catalase and ascorbate peroxidase) in the peel of artificially inoculated tangerine (Citrus reticulata Blanco cv. Sai Nam Pung) fruit were examined. Ozone (200μLL -1) was applied for 0 (control), 2, 4 or 6h to inoculated tangerine fruit. Exposing fruit to ozone for 4 and 6h delayed disease incidence and reduced severity. Scanning electron microscopy confirmed that exposing fruit to ozone for 4 and 6h reduced growth of fungi on the fruit peel. The activities of superoxide dismutase, catalase and ascorbate peroxidase were increased after ozone fumigation and remained significantly higher than those of the control fruit through three days of storage at 25°C. Throughout the experiment, fruit qualities in all treatments were not affected by ozone exposure and no phytotoxicity occurred in fruit exposed to high doses of ozone. © 2011 Elsevier B.V.

Hassarangsee S.,Postharvest Technology Research Institute | Chantara S.,Chiang Mai University | Whangchai K.,Postharvest Technology Research Institute | Whangchai K.,Chiang Mai University | And 2 more authors.
Acta Horticulturae | Year: 2015

The reduction of Ethion, a frequently used pesticide in tangerine production was carried out by titanium dioxide (TiO2) photocatalysis with different concentrations (5, 10, 20, 40 and 60 mg ml-1) and exposure times (0, 15, 30, 45 and 60 min) under a UV lamp. To evaluate the oxidation potential by TiO2 photocatalysis effects, iodine liberation from the reaction was measured. Iodine yield, which increased with increasing concentration and reaction time, was highest at 60 mg ml-1 of TiO2 and longest at 60-min exposure time. TiO2 photocatalysis at the highest concentration was the most effective (60%) at reducing Ethion concentration with the highest rate of degradation occurring within the first 15 min (60%). When treated for alonger exposure time, the reduction of Ethion became insignificant.

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