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General appearance, wilting, browning and off-odor of fresh-cut celery during storage were evaluated by a trained sensory panel (three persons) against fresh harvested celery. The scores were general appearance,1: very poor; 5: fair; 9: excellent. The safety of food is very important to consumers. Microorganisms on vegetables, such as pathogenic bacteria could damage human health. In order to reduce microorganisms on the fresh-cut celery, gamma radiation was used. The irradiation effect on the microorganisms is shown in Table 1. Microbial populations on the fresh-cut celery decreased with an increase of irradiation dose; and bacteria appeared to be more sensitive to radiation than fungi, that is, bacteria decreased by order of 102, while fungi only by one order, when celery was irradiated with 1.5 kGy. However, the microbial numbers increased with increasing storage time at 4 C, indicating that the microorganisms injured by irradiation were able to recover somewhat. On the other hand, bacteria of the E. coli group were reduced to less than 30, which was the safety level, when irradiated with 1.0 kGy. Prakash and others studied the effects of low-dose gamma irradiation and conventional treatments on shelf-life and quality characteristics of diced celery (Prakash et al., 2000).Their results showed that aerobic plate counts for the irradiated celery did not exceed 107 cfu/g; in contrast, the acidified, blanched, chlorinated and control samples exceeded 108 cfu/g after 22, 19, 12 and 8 days, respectively. From these results, it was demonstrated that irradiation was effective in reducing the microbial population on fresh-cut celery, and ensured the safety of the products. |
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