Effect of desiccation, starvation, heat, and cold stresses on the thermal resistance of Enterobacter sakazakii in rehydrated infant milk formula

Shaker, R.R., Osaili, T.M., Al-Hasan, A.S.A., Ayyash, M.M. and Forsythe, S.J. ORCID: 0000-0002-6709-0712, 2008. Effect of desiccation, starvation, heat, and cold stresses on the thermal resistance of Enterobacter sakazakii in rehydrated infant milk formula. Journal of Food Science, 73 (7). ISSN 1750-3841

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Abstract

Enterobacter sakazakii has been implicated in outbreaks of meningitis, septicemia, and necrotizing enterocolitis in immunocompromised and premature neonates. In this study, the effect of desiccation stress, starvation stress, heat shock and cold shock on thermal inactivation of E. sakazakii in rehydrated infant milk formula was evaluated. Stressed cells were mixed with rehydrated infant milk formula at 52, 54, 56, and 58°C for various time periods. The D- and z-values were determined by using linear regression analysis. Z)-values for unstressed E. sakazakii at 52, 54, 56 and 58°C were 15.33, 4.53, 2.00 and 0.53 min, respectively. Desiccation and heat stress, but not starvation or cold stress, caused significant reduction in Z)-values. For example, D52 was 15.33 min for unstressed cells compared with 8.72 and 7.36 after desiccation and heat stress. Z-values of 53 desiccated, starved, heat shocked and cold shocked E. sakazakii were not significantly different from unstressed cells (4.22°C). The results of this study may be of use to regulatory agencies, infant milk producers and infant caregivers to design heating processes to eliminate E. sakazakii that may be present in infant milk formula.

Item Type: Journal article
Description: The definitive version is available at www3.interscience.wiley.com
The definitive version is available at www.blackwell-synergy.com
Publication Title: Journal of Food Science
Creators: Shaker, R.R., Osaili, T.M., Al-Hasan, A.S.A., Ayyash, M.M. and Forsythe, S.J.
Publisher: Institute of Food Technologists/Wiley-Blackwell
Date: 2008
Volume: 73
Number: 7
ISSN: 1750-3841
Identifiers:
NumberType
10.1111/j.1750-3841.2008.00880.xDOI
Rights: Copyright © 2008 John Wiley & Sons, Inc. All Rights Reserved.
© 2008 Institute of Food Technologists.
Divisions: Schools > School of Science and Technology
Depositing User: EPrints Services
Date Added: 09 Oct 2015 10:59
Last Modified: 09 Jun 2017 13:46
URI: http://irep.ntu.ac.uk/id/eprint/21181

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