Effects of Electron Beam Irradiation on dose uniformity ratio and quality of Hoa Loc mango

Australia has allowed the import of 04 types of fruits including dragon fruit, lychee, longan and mango from Vietnam. However, for exporting to this market, fruits must be quarantined. Using electron beam (EB) irradiation as quarantine treatment for fresh fruits in particular and foods of plant origin in general is a growing trend of the world. Our preliminary results on EB irradiation impacts on Hoa Loc mangoes showed that EB irradiation could be a suitable quarantine treatment for the Hoa Loc mango fruits having weight from 407 to 552g and thickness from 7.3 to 8.0 cm to ensure the dose uniformity ratio (DUR) among irradiated products is within limitation (DUR ≤ 2.5). Main quality parameter of irradiated mangoes were insignificantly affected by exposure to EB with the dose ranging from 0.4 to 0.8 kGy, though their weight loss (%), the color indices L* (lightness), a* (redness to greenness), b* (yellowness to blueness) and firmness were slightly changed in compared with the control (non-irradiated). The results also revealed that vitamin C concentration of the fruits irradiated with 1 kGy much reduced and hue angle (ho value) significant increased by the end of storage. These results concluded that EB irradiation of Hoa Loc mangoes at the generic doses of 0.4 KGy is a feasible quarantine treatment that maintains the main the fruit quality. (author)