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KMID : 1134820090380070964
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Journal of the Korean Society of Food Science and Nutrition
2009 Volume.38 No. 7 p.964 ~ p.969
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Gamma Irradiation for Sanitation of Vegetable Fresh Juice Containing Non-thermal Process Materials
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Kwon Sang-Chul
Jo Cheo-Run
Lee Kyong-Haeng
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Abstract
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To improve hygienic quality of vegetable fresh juice containing non-thermal process materials, an irradiation technology (0~5 kGy) was applied and microbiological and physicochemical changes were evaluated during storage. The initial number of total aerobic bacteria of vegetable fresh juice containing non-thermal process materials was 4.8×10³ CFU/mL and the number was increased during storage. At day 7, the number reached 3.0×10? CFU/mL. However, the samples gamma-irradiated at 1~5 kGy were 1.2×10²~1.0×10³ CFU/mL, which was lower than that of control and higher than 3 kGy irradiation, showing more than a decimal reduction. The lightness and yellowness of irradiated sample was higher than control but no difference was found among storage days; whereas, redness was decreased by gamma irradiation with no difference found among storage days. Ascorbic acid and carotenoid contents were decreased by irradiation treatment and increase of storage days. There were no changes in flavonoid contents; however, the content of polyphenols was increased by irradiation of sample.
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KEYWORD
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vegetable fresh juice, gamma irradiation, sanitation, microbiological change, physicochemical change
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