Gamma Radiation Sensitivity of Enterobacter sakazakii in Dehydrated Powdered Infant Formula

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Abstract:

The observed Enterobacter sakazakii D 10-values for tryptic soy broth and dehydrated powdered infant formula were 0.27 ± 0.05 and 0.76 ± 0.08 kGy, respectively. A decrease of approximately 3 log in the dehydrated powdered infant formula was obtained by irradiation with 3.0 kGy or rehydration with hot water at 80°C. No recoverable bacteria were found in the powdered infant formula irradiated at 5.0 kGy and stored, either before or after rehydration. A radiation dose of up to 5.0 kGy had no marked effect on the sensory properties of the dehydrated powdered infant formula after rehydration and heating. Gamma radiation could potentially be used to inactivate E. sakazakii in dehydrated powdered infant formula; however, nutritional studies need to be conducted before the use of radiation can be recommended.

Document Type: Research Article

Affiliations: 1: Radiation Application Research Division, Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, P.O. Box 1266, Sinjeong-Dong, Jeongeup-Si, Jeonbuk-Do, 580-185, Republic of Korea 2: Department of Food and Nutrition, Chungnam National University, Gung-Dong 220, Yuseong, Daejeon 305-764, Republic of Korea

Publication date: June 1, 2006

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