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유통 중인 어린잎채소의 미생물 오염도 조사

Investigation of Hazardous Microorganisms in Baby Leafy Vegetables Collected from a Korean Market and Distribution Company

한국식품위생안전성학회지 2019년 34권 6호 p.526 ~ 533
김세리 ( Kim Se-Ri ) - 농촌진흥청 국립농업과학원 농산물안전성부

추현진 ( Chu Hyeon-Jin ) - 농촌진흥청 국립농업과학원 농산물안전성부
이승원 ( Yi Seung-Won ) - 농촌진흥청 국립농업과학원 농산물안전성부
장윤정 ( Jang Youn-Jung ) - 농촌진흥청 국립농업과학원 농산물안전성부
심원보 ( Shim Won-Bo ) - 경상대학교 농화학식품공학과
웅웬바오훙 ( Nguyen Bao Hung ) - 농촌진흥청 국립농업과학원 농산물안전성부
김원일 ( Kim Won-Il ) - 농촌진흥청 국립농업과학원 농산물안전성부
김현주 ( Kim Hyun-Ju ) - 농촌진흥청 국립농업과학원 농산물안전성부
류경열 ( Ryu Kyoung-Yul ) - 농촌진흥청 국립농업과학원 농산물안전성부

Abstract


The purpose of this study was to investigate hazardous microorganisms in mixed baby leafy vegetables and various baby leafy vegetables used as raw materials for fresh-cut produce in spring and summer. To estimate microbial loads, a total of 298 samples including 181 samples of mixed baby leafy vegetables purchased in a Korean market and 117 samples of various baby leafy vegetables from distribution companies were collected. Fecal indicators (coliform and Escherichia coli) as well as food-borne pathogens (E. coli O157:H7, Salmonella spp., Staphylococcus aureus) were enumerated. As a result, the mixed baby leafy vegetable samples showed significantly higher (P<0.05) coliform bacteria numbers in summer (5.59±1.18 log CFU/g) compared to spring (3.60±2.53 log CFU/g). E.coli was detected in 1.3% (1/79) and 42.2% (43/102) of samples collected in spring and summer, respectively. Only one sample collected from a market in spring was contaminated with S. aureus. In the experiment with baby leafy vegetables, the number of coliforms detected in baby leafy vegetables cultivated in soil in spring was 1.15±1.95 log CFU/g, and that in summer was 4.09±2.52 log CFU/g. However, the number of coliforms recovered from baby leafy vegetables cultivated in media was above 5.0 log CFU/g regardless of season. Occurrences of E. coli were 44.4% (12/ 27) and 19.0% (4/21) for baby leafy vegetables cultivated in soil and media, respectively. However, E. coli O157:H7 and Salmonella spp. were not detected. These results are in relation to microbial loads on mixed baby leafy vegetables associated with raw materials. Therefore, it is necessary to develop and implement hygienic practices at baby leafy vegetable farms to enhance the safety of fresh produce.

키워드

Baby leafy vegetable; Indicator bacteria; Food borne pathogens
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