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The detection of cotinine in hydrolyzed meconium samples
D Dempsey1, C Moore, D Deitermann
1San Francisco Bay Area Regional Poison Control Center, CA, USA.
Forensic Science International
|August 28, 1999
Summary
Hydrolyzing meconium samples significantly improves the detection of cotinine, a marker for tobacco exposure in newborns. This enhanced method is crucial for accurately identifying prenatal smoke exposure in at-risk infants.
Area of Science:
- Toxicology
- Neonatal Screening
- Analytical Chemistry
Background:
- Meconium analysis is challenging for determining newborn tobacco exposure.
- Cotinine may form bonds with proteins, requiring hydrolysis for accurate detection.
- Newborns in the study were at risk due to suspected prenatal substance abuse.
Purpose of the Study:
- To evaluate the necessity of meconium hydrolysis for cotinine detection.
- To compare cotinine detection rates with and without meconium hydrolysis.
- To validate a micro-plate enzyme immunoassay (EIA) for meconium cotinine screening.
Main Methods:
- Analyzed 102 meconium samples using routine non-hydrolysis extraction.
- Performed hydrolysis on separate aliquots followed by identical extraction.
- Utilized a specific cotinine micro-plate enzyme immunoassay (EIA) for comparison.
Main Results:
- Non-hydrolyzed samples showed 33% cotinine positivity.
- Hydrolyzed samples demonstrated a significantly higher positivity rate of 79%.
- Common drugs of abuse did not interfere with the cotinine analysis.
Conclusions:
- Meconium hydrolysis is essential for accurate 'free' cotinine detection.
- Micro-plate EIA after hydrolysis offers a reliable method for newborn cotinine screening.
- This method aids in identifying prenatal tobacco exposure in at-risk neonates.