Effects of Electron Beam Irradiation on the Infestation and Quality of Dried Goji (Lycium barbarum)
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Abstract:
The effects of electron beam irradiation on the quality of dried goji were examined, and the dosage of irradiation as an insecticide was determined. Dried goji was irradiated using an electron irradiation accelerator, and the effects of different doses of irradiation on the rehydration ratio, insect infestation rate, color, reducing sugars, carotenoids, and other physicochemical indicators were evaluated. The rehydration ratio of irradiated dried goji was significantly lower than that of non-irradiated dried goji. Electron beam irradiation treatment significantly inhibited the insect infestation of dried goji, and the higher the irradiation dose, the more significant the inhibitory effect on the infestation rate. At the irradiation doses of 4~8 kGy, no insects appeared in goji until the end of the experiment. At the irradiation dose of 2 kGy, the infestation rate was 0.57% at the end of the experiment, which was significantly lower than that in the non-irradiated dried goji (0.97%). At doses of 8 kGy or higher, the L*, a*, and b* values of dried goji were significantly lower than those of non-irradiated dried goji. Irradiation significantly increased the contents of reducing sugars and polysaccharides in dried goji but did not significantly affect soluble sugars and free amino acids. The carotenoid and flavonoid content of dried goji decreased significantly at irradiation doses of 8 kGy or higher. In summary, the electron beam irradiation dose of dried goji should be in the range of 4~8 kGy. Doses in this range can effectively inhibit the infestation of dried goji and allow for maintaining their original edible quality to the greatest possible extent.
