Effects of UV-C irradiation on the quality changes and disease control of ‘Nam Dok Mai Sithong’ mangoes during storage
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Abstract
Mango is an economically important fruit in Thailand. Exported mangoes often face some problems with loss of quality, disease, and insect infestation. By irradiating UV-C rays, it can delay deterioration and control disease in many types of fruits including mango. The objective of this study was to determine the effect of UV-C irradiation on the changes of quality and disease control of ‘Nam Dok Mai SiThong’ mango during storage at room temperature (25±2 °C) by using a completely randomized design (CRD), which consists of 4 treatments: UV-C irradiation at doses of 0 (control), 2.47, 4.93 and 7.37 KJ/m2. The experiment was done by growing the fungus that causes anthracnose (Colletotrichum gloeosporioides) on the peels of mango fruit. Then stored at room temperature (25±2 °C). The results were recorded every 3 days. It was found that UV-C radiation had no effect on the percentage of weight loss, firmness, green value (a*), yellow value (b*) of the peel, total soluble solids, titratable acidity, and vitamin C content of ‘Nam Dok Mai SiThong’ mangoes during 12 days of storage, while the brightness value (L*) of ‘Nam Dok Mai SiThong’ mango peels decreased. Without UV-C irradiation treatment, it had a higher L* value than UV-C treated at all levels after 3, 9, and 12 days of storage, with the values of 73.99, 68.33, and 67.63, respectively. In addition, without UV-C irradiation treatment was infestation and growth of the fungus C. gloeosporioides cause of anthracnose, with the level of 3.2, while all three levels of UV-C irradiation were able to control the growth of the anthracnose fungus in ‘Nam Dok Mai SiThong’ mangoes after stored at 12 days.
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References
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