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J. Microbiol. Biotechnol. 2006; 16(4): 639-642

Published online April 28, 2006

Copyright © The Korean Society for Microbiology and Biotechnology.

Reduction of Bacillus cereus in Cooked Rice Treated with Sanitizers and Disinfectants

Lee, Min-Jeong , Dong-Ho Bae 1, Dong-Ha Lee 2, Ki-Hyo Jang 3, Deog-Hwan Oh 4 and Sang-Do Ha 4*

Department of Food Science and Technology/BET Research Institute, Chung-Ang University, Ansung 456-756, Korea, 1Division of Bioscience & Biotechnology, Konkuk University, Seoul 143-701, Korea, 2Korea Food and Drug Administration, Seoul 122-704, Korea, 3Department of Food and Nutrition, Kangwon National University, Samcheok, Kangwon 245-711, Korea, 4School of Biotechnology and Bioengineering, Kangwon National University, Chunchon, Kangwon 200-701, Korea

Abstract

This study aimed to identify effective washing and sanitation programs to minimize the contamination of cooked rice by B. cereus. As such, the effectiveness of five sanitizers, including QAC, alcohol, chlorine, CaO, and $H_2O_2$, was evaluated in relation to the survivability of B. cereus spores in cooked rice and resulting sensory properties of the rice. The water-treated cooked rice showed remaining B. cereus spores at 1.09 $log_{10}CFU/g$. In contrast, treatment with the minimum inhibitory concentrations of the sanitizers, such as 200 ppm of QAC, 50% of alcohol, 100 ppm of chlorine, 650 ppm of CaO, and 500 ppm of $H_2O_2$, destroyed all the spores in the cooked rice below a non-detection limit (ND< 0.15 CFU/g). The sensory properties of the sanitizer-treated (1,000 ppm of $H_2O_2$, 100 ppm of chlorine, and 800 ppm of CaO) cooked rice did not differ significantly from those of the water-treated cooked rice. As a result, 500 ppm of $H_2O_2$, 650 ppm of CaO, and 100 ppm of chlorine were found to effectively eliminate B. cereus spores in rice while cooking.

Keywords: Bacillus cereus, rice, quaternary ammonium compound, alcohol, calcium oxide, hydrogen peroxide, chlorine