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Gamma irradiation as phytosanitary treatment for red flesh dragon fruit

Uthairatanakij, A., Cholmaitri, C., Aimala-or, S., Jitareerat, P.
Acta horticulturae 2018 no.1210 pp. 145-150
Hylocereus, color, disinfection, exports, fruit flies, fruit quality, fruits, gamma radiation, pulp, total soluble solids, Thailand, United States
Gamma irradiation is one of the most commonly used phytosanitary techniques for disinfection of product to control fruit flies. Tropical fruit requires gamma irradiation for export from Thailand to the US. However, gamma irradiation may affect fruit quality after treatment and during storage. The aim of this study was to determine the effect of gamma irradiated dragon fruit (pitaya red flesh) quality. Fruit were exposed to gamma ray at 400-600 Gy before storage at ambient conditions. Results showed that gamma irradiation did not affect either pulp or bract colour changes (L*, a*, b* values and hue angle). In addition, the treatment had no effect on total soluble solids content and fruit firmness during storage for 9 days. Thus, gamma irradiation can be used as phytosanitary treatment for dragon fruit export to the US.