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The total sugar content of fresh-cut celery increased with longer storage time. But the total sugar content of fresh-cut celery was increased by irradiation, com-pared with nonirradiated celery. It, however, reached the same level on day 9 of storage (Fig. 5). Beside microbial population, nutritional value of fresh-cut celery, the sensory quality showed the storage effect. The sensory quality of irradiated fresh-cut celery was evaluated. The sensory of nonirradiated celery decreased with longer storage time, and it appeared to be the worst at storage of day 9. However, the sensory quality of irradiated celery was better than that of the nonirradiated celery, and the celery irradiated with 1.0 kGy was the best among irradiated celery. The results indicated that the irradiation had good effect for preservation of fresh-cut celery. In the case of 0.5 and 1.5 kGy, the sensory quality of irradiated celery was lowered after 9 days of storage (Table 2). The result could be explained that larger irradiation dose could damage, even kill part of cells, and low-dose irradiation dose could not effectively control the microbial population. Therefore, the preservation effect of irradiation with 0.5 kGy and 1.5 kGy was worse than irradiated one with 1.0 kGy. From above research results, it came to the conclusion that the shelf-life of fresh-cut celery was extended by 3¨C6 days through c-rays irradiation. The best preservation effect appeared to 1.0 kGy of irradiation, with which the microbial population was able to lower by the order of 102, to maintain the good sensory and nutritional quality after 9 days of storage. |
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