Storage Quality of Ctenopharyngodon idellus Fillets Irradiated by High-energy Electron Beam
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Abstract:
In this study, the preservative effect of high-energy electron beam irradiation technology on crisped grass carp fillets was investigated. Different irradiation doses (0, 1, 3, 5, 7 kGy) combined with vacuum packaging and storage under 4 ℃ refrigeration were applied, and the total colony count (aerobic plate count, APC), lipid oxidation products (thiobarbituric acid, TBARs), volatile basic nitrogen (TVB-N), texture (TPA), color and sensory scores were measured, to examine the effect of electron beam irradiation on the quality of fish fillet during cold storage. The results showed that the growth of microorganisms in the fillets could be inhibited to a great extent by irradiation, and the total colony number of the fillets could be kept below 106 CFU/g over the whole storage after the irradiation at a dose of 3~7 kGy, indicating that 3 kGy was the lowest effective dose for the fillets. Although the TBARs value of grass carp fillets increased after the irradiation, the irradiation could delay further increase of TBARs value during the late stage of storage. A dose at 5 kGy or lower could make the TBARs remaining at a relatively low level. Similarly, irradiation could delay the increase of the TVB-N content in grass carp fillets. The effects of irradiation on odor, texture and color of the fillets were insignificant. Taken together, under vacuum packaging and 4 ℃ cold storage, 3 kGy was the lowest effective dose for the fillets, and 5 kGy was the highest tolerated dose, with the irradiation at a dose of 3~5 kGy being the most suitable treatment for the storage and preservation of the crisped grass carp fillets. The results of this study provide a reference for the application of electron beam irradiation to the preservation of crisped grass carp fillets.
