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http://dx.doi.org/10.5851/kosfa.2010.30.3.479

Biocontrol of Isolated Cronobacter spp. (Enterobacter sakazakii) by Heat, Sanitizer, and Antibiotic  

Lee, Eun-Jin (Department of Food Science and Biotechnology, Kyungwon University)
Park, Jong-Hyun (Department of Food Science and Biotechnology, Kyungwon University)
Publication Information
Food Science of Animal Resources / v.30, no.3, 2010 , pp. 479-486 More about this Journal
Abstract
Tolerance against heat, sanitizers, and antibiotics of 112 Cronobacter isolates classified by desiccation was determined to permit effective biocontrol in powdered foods. The isolates were classified into three groups: dry-tolerant (n=37), dry-sensitive (n=7), and dry-intermediate (n=68). The strains that were highly tolerant to drying also showed high heat tolerance that they seemed to have high tolerance to heat after dry stress in powdered foods like infant formula. Sodium hypochlorite and benzalkonium chloride concentrations necessary to achieve a 5-log reduction in viable counts (CFU/mL) were 15-25 ppm and 5-15 ppm, respectively. However, there was little difference of the efficacy of these sanitizers between dry-sensitive and -tolerant strains for planktonic cells suspended in 3% albumin. The minimal inhibition concentration (MIC) of $\beta$-lactam ampicillin was 64-128 ppm for 90% of the strains. The isolates were consistently sensitive to kanamycin and naldixic acid (MIC=4 ppm). Dry-tolerant strains displayed more antibiotic resistance than dry-sensitive strains. The results indicate that dry-tolerant Cronobacter isolates often possess heat and antibiotic resistance, indicated the need for potent sterilization treatments of powdered foods.
Keywords
powdered food; Cronobacter; desiccation; heat; sanitizer; antibiotic;
Citations & Related Records
Times Cited By KSCI : 6  (Citation Analysis)
Times Cited By Web Of Science : 0  (Related Records In Web of Science)
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