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Updated: Jul 20, 2026
ELIME (Enzyme Linked Immuno Magnetic Electrochemical) Method for Mycotoxin Detection
Published on: October 23, 2009
Detection of Enterobacter sakazakii in dried infant milk formula by cationic-magnetic-bead capture
N R Mullane1, J Murray, D Drudy
1Centre for Food Safety, School of Agriculture, Food Science and Veterinary Medicine, University College Dublin, Belfield, Dublin 4, Ireland.
Abstract:
Enterobacter sakazakii has been associated with life-threatening infections in premature low-birth-weight infants. Contaminated infant milk formula (IMF) has been implicated in cases of E. sakazakii meningitis. Quick and sensitive methods to detect low-level contamination sporadically present in IMF preparations would positively contribute towards risk reduction across the infant formula food chain. Here we report on the development of a simple method, combining charged separation and growth on selective agar, to detect E. sakazakii in IMF. This protocol can reliably detect 1 to 5 CFU of E. sakazakii in 500 g of IMF in less than 24 h.
Insights
A new method detects low levels of Enterobacter sakazakii contamination in infant milk formula (IMF) within 24 hours. This rapid detection helps reduce the risk of serious infections in vulnerable infants.
Area of Science:
- Microbiology
- Food Safety
- Clinical Microbiology
Background:
- Enterobacter sakazakii causes severe infections, particularly in premature infants.
- Contaminated infant milk formula (IMF) is a known source of E. sakazakii outbreaks.
- Existing detection methods may not be sensitive enough for low-level, sporadic contamination.
Purpose of the Study:
- To develop a rapid and sensitive method for detecting Enterobacter sakazakii in IMF.
- To enhance food safety within the infant formula supply chain.
- To mitigate the risk of life-threatening infections in infants.
Main Methods:
- Combined charged separation with selective agar growth for bacterial isolation.
- Developed a protocol for detecting low levels of E. sakazakii in IMF.
- Validated the method's speed and sensitivity.
Main Results:
- The developed method reliably detects 1 to 5 CFU of E. sakazakii per 500 g of IMF.
- Detection is achieved in less than 24 hours.
- The protocol is simple and effective for IMF analysis.
Conclusions:
- A novel, rapid, and sensitive method for E. sakazakii detection in IMF has been established.
- This method significantly contributes to reducing contamination risks in infant formula.
- The protocol supports enhanced safety measures in the infant formula food chain.
