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http://dx.doi.org/10.3746/jkfn.2003.32.7.991

Determination of Microbial Contamination in the Process of Rice Rolled in Dried Laver and Improvement of Shelf-life by Gamma Irradiation  

김동호 (한국원자력연구소 방사선식품ㆍ생명공학연구팀)
송현파 (한국원자력연구소 방사선식품ㆍ생명공학연구팀)
김재경 (한국원자력연구소 방사선식품ㆍ생명공학연구팀)
김정옥 (세종대학교 생활과학관)
이현자 (한경대학교 가정학과)
변명우 (한국원자력연구소 방사선식품ㆍ생명공학연구팀)
Publication Information
Journal of the Korean Society of Food Science and Nutrition / v.32, no.7, 2003 , pp. 991-996 More about this Journal
Abstract
Determination of regional microbial contamination in the process of rice rolled in dried laver (Kimbab) and effects of gamma irradiation on the improvement of hygienic quality and shelf stability were investigated. Total aerobic bacterial distribution of raw materials of Kimbab were; 10$^{6}$ ∼10$^{7}$ CFU/g in dried laver, 10$^3$ CFU/g in cucumber and below 10 CFU/g in steamed rice, ham, fried egg, and salted radish. Total coliform bacteria were 10$^3$ CFU/g in dried laver and detected below detection limit (10 CFU/g) in other raw materials. And it was arithmetically calculated that the levels of total aerobic bacteria and coliform bacteria in Kimbab does not exceed 10$^{5}$ CFU/g and 10$^1$ CFU/g under the aseptic process, respectively. However, microbial contamination levels in just prepared Kimbab in a market were about 10$^{6}$ CFU/g of total aerobic and coliform bacteria. Therefore, it was considered that microbial contamination of Kimbab is mainly originated from environmental uptake during the preparation. The representative media for putrefying bacterial growth were steamed rice. Coliform bacteria were mainly increased in ham and fried egg during storage. The bacteria in dried laver were radio-resistant and survived at 3 kGy of gamma irradiation. Coliform bacteria on EMB agar plate were eliminated at the dose of 2 kGy. The sensory acceptability of 2 kGy irradiated Kimbab was stable and the Kimbab can be preserved for 24 hour at 15$^{\circ}C$. Therefore, it was considered that optimal irradiation dose for radicidation of Kimbab was 2 kGy.
Keywords
laver; Kimbab; gamma irradiation; hygienic quality; shelf life;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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