30G-33 |
Effects of low-dose gamma irradiation on the shelf-life and quality characteristics of diced bell peppers |
S. MASSON1, F. Caporaso, D. M. Foley, and A. Prakash. (1) Department of Food Science and Nutrition, Chapman University, 12465 Fallcreek Lane, Cerritos, CA 90703 Freshness and convenience are two factors that have fueled the demand for fresh-cut fruits and vegetables, however the shelf life of these products are limited. For example, the shelf-life of diced bell peppers is limited to 5 days which includes packaging and distribution. Thus there is an interest in extending the shelf life of these perishable foods using non-thermal technologies that will preserve freshness. The objective of this paper is to determine the effects of gamma irradiation on the shelf life and quality characteristics of diced bell peppers. Diced bell peppers were subjected to gamma irradiation using a cobalt 60 source at dosages of 0.5., 1.0, and 3.0kGy. The samples were evaluated over a 17 day time period for changes in total plate counts, yeast and mold, texture, color, pH, headspace, and sensory attributes. The total plate counts (TPC) and yeast and mold for the diced bell peppers were significantly reduced in the irradiated samples. On day 10, TPC for the 1.82 and 3.70 kGy samples were 7.56 log cfu/g and 5.60 log cfu/g respectively. Where as, the control was 9 log cfu/g, in which spoilage was obvious in the form of sliminess and off odor. Yeast and mold counts were reduced by 1-2 by irradiation. Texture was initially softer for the irradiated samples at day one ranging from 14% (0.5 kGy sample) to 56% (3.70 kGy sample). Sensory testing indicated that the irradiation induced softness was unacceptable at 3.70 kGy, but was acceptable for the 1.82 kGy dosage. Other sensory attributes such as color, odor, and flavor were also preserved at this dose. Color and pH were not affected by irradiation. Irradiation at 1.82 kGy significantly delayed microbial growth while maintaining quality characteristics. Irradiation can provide an effective means for extending the shelf life of diced bell peppers.
Session 30G, Fruit & Vegetable Product: Processed Fruits and Vegetables
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