Effects of 60Co-γ-irradiation Combined with Cold Storage on Storage Quality of Different Packing Peanuts
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Abstract:
In order to prolong the storage period of peanut kernel, the effects of 60Co-γ-irradiation combined with cold storage on storage quality of different packing peanuts were studied. The peanut kernel samples were treated at the irradiation doses 1.5 kGy by 60Co-γ ray and were packed by polyethylene bag, vacuum polyethylene bag and vacuum fresco bag, respectively. To evaluate the storage effectiveness of 60Co-γ-irradiation combined with cold storage of peanuts, during the period, the main physic-chemistry indexes were determined including microorganism, nutrient content, moisture content, texture characteristics, lipoxygenase and volatile component. The results showed that the total bacterial count of un-irradiated group was 980 CFU/g in the 4th month of storage, which exceeded the standard of 750 CFU/g, while the total colonies of irradiated peanuts were all lower than 340 CFU/g in the 14th months of storage, which met the standard. During storage, irradiation treatment did not have obvious effects on the nutritional composition and texture characteristics of peanut kernels. It is beneficial to reduce water loss and maintain the activity of lipid oxidase in peanut kernels under low temperature storage. Different packages of irradiated peanut kernels showed certain differences during storage, the changes of nutritional quality, texture characteristics and odor of peanut kernels packed with vacuum tin foil bags were the smallest. In conclusion, the storage period of peanut kernel could be extended to 14 months by 60Co-γ-irradiation combined with cold storage. This methodis easy to realize the industrialization, which has important instruction significance for industrialized production of peanut.
