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KMID : 1011620170330060702
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Korean Journal of Food and Cookey Science
2017 Volume.33 No. 6 p.702 ~ p.707
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Inactivation of Cronobacter sakazakii in Powdered Infant Formula Using Ultraviolet (UV) Radiation
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Kim Min-Su
Park Eun-Jin
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Abstract
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Purpose: Powdered infant formula is often exposed to microbial contamination during drying, mixing and packaging, even if it is pasteurized. This study aimed to examine the efficacy of ultraviolet (UV) radiation inactivation of Cronobacter sakazakii causing meningitis in infants through contamination of powdered infant formula.
Methods: We applied UV radiation to powdered infant formula contaminated with C. sakazakii at thickness of 1, 3, and 5 mm for 5 min and 10 min and monitored inactivation of C. sakazakii by UV radiation. After stirring the contaminated powdered infant formula every 30 sec, we compared reduction of C. sakazakii between the rotation and non-rotation samples. We applied UV radiation to the contaminated powdered infant formula packaged using three types of polyethylene and low density polyethylene wrapping papers and evaluated the effects of individual packaging on reduction of C. sakazakii by UV radiation.
Results: As the thickness of powdered infant formula increased, inactivation of C. sakazakii by UV radiation declined. Reduction of C. sakazakii was significantly higher in the rotation sample than the non-rotation sample. Viable counts of C. sakazakii were reduced with increasing time of exposure to UV radiation, although statistical significance was not obtained. Particularly, sterilization of C. sakazakii by UV radiation was larger in LDPE paper than in PE paper.
Conclusion: This study suggests that microbial contamination by C. sakazakii in powdered infant formula can be reduced by UV radiation before and after packaging, thereby contributing to microbiological safety of powdered infant formula.
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KEYWORD
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powdered infant formula, Cronobacter sakazakii, Enterobacter sakazakii, ultraviolet radiation
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