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Biocontrol of Isolated Cronobacter spp. (Enterobacter sakazakii) by Heat, Sanitizer, and Antibiotic
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Biocontrol of Isolated Cronobacter spp. (Enterobacter sakazakii) by Heat, Sanitizer, and Antibiotic
Lee, Eun-Jin; Park, Jong-Hyun;
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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 -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.
powdered food;Cronobacter;desiccation;heat;sanitizer;antibiotic;
 Cited by
Cronobacter spp. 의 오염, 제어, 검출에 관한 최신 연구동향,송광영;천정환;김현숙;서건호;

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