시판 백미의 미생물학적 프로파일 정량분석

Quantitative Analysis of Microbiological Profiles of Retailed White Rice

  • Received : 2011.05.24
  • Accepted : 2011.08.12
  • Published : 2011.09.30

Abstract

쌀의 미생물학적 프로파일을 규명하기 위하여 잔류 미생물들을 총호기성균, 포자형성 호기성균, 젖산균, 진균, 그러고 대장균 및 대장균군 등의 5개 미생물 group으로 구분하였다. 그리고 이들 5 개 미생물 group에 대하여 총 9개 국내 시판 백미 검체별로 잔류 미생물 정량분석을 수행하였다. 9개 백미 검체 중 백미 1 검체의 총호기성균수($2.4{\times}10^6$ CFU/g)가 가장 높았으며, 9개의 백미 검체의 평균 총 호기성 균수는 $3.9{\times}10^5$ CFU/g으로 측정되었다. 쌀 검체별 호기성 포자형성균수는 모든 9종의 백미 검체가 $1.0{\times}10^2$-$2.5{\times}10^3$ CFU/g 범위에 있었다. 쌀 검체별 젖산균은 총 9개 백미 검체중 2개 백미 검체에서만 검출되었다. 백미 2 검체의 젖산균수가 $3.7{\times}10^3$ CFU/g, 백미 4 검체의 젖산균수가 $4.0{\times}10^2$ CFU/g으로 각각 검출되었다. 쌀 검체별 진균수는 총 9개의 백미검체 중 백미 1 검체에서만 검출되었으며, 검체의 진균오염정도는 백미 1 검체의 진균수가 $2.0{\times}10^2$ CFU/g으로 검출되었다. 쌀 검체별 대장균수는 총 9개의 모든 백미 검체에서 대장균이 검출한계이하 수준으로 존재하는 것으로 확인되었다. 대장균군의 경우 백미 4 검체의 대장균군수가 $4.1{\times}10$ CFU/g으로 검출되었다. 그리고 다른 모든 백미 검체에서는 대장균군이 검출한계이하 수준으로 존재하는 것으로 확인되었다.

Rice has been the most important staple food in everyday meals of Korean people for thousands of years. Nowadays, it is getting increasingly used as flour ingredients in a variety of processed foods, so that it is consumed in more diversified ways. As a consequence, production volume of rice flour to manufacture rice cakes, noodles, breads, or confectioneries is recently getting increased in Korea. But there are not sufficient research outcomes to guarantee Korean consumers microbiological qualities of rice flour as well as rice. As a preliminary experiment, therefore, the microbiological profiles (aerobic mesophilic bacteria (AMB), spore-forming aerobic bacteria (SAB), lactic acid bacteria (LAB), yeasts and molds (YM), and Escherichia coli and coliforms) have been monitored for nine retailed white rice samples in this study. AMB counts ranged $10^2-10^6$ CFU/g for all the nine white rice samples. All the nine rice samples have SAB counts within a narrow range $(1.0{\times}10^2-2.5{\times}10^3$ CFU/g). LAB was detected in two white rice samples ($4.0{\times}10^2$ and $3.7{\times}10^3$ CFU/g), YM was detected in one white rice sample ($2.0{\times}10^2$ CFU/g) only. E. coli was not detected from all the nine samples. Coliforms were detected in one white rice sample ($4.1{\times}10$ CFU/g) only. All the rice samples were conclusively considered to have various microorganisms, though most of them are harmless and some, such as coliforms, may be harmful.

Keywords

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