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Related Experiment Videos

In vitro reaction of barbiturates with formaldehyde.

P M Gannett1, J R Daft, D James

  • 1West Virginia University, School of Pharmacy, Basic Pharmaceutical Sciences, Morgantown 26506, USA. pgannett@hsc.wvu.edu

Journal of Analytical Toxicology
|September 12, 2001
PubMed
Summary

Barbiturate decomposition after death, especially post-embalming, can lead to false negatives in forensic analysis. Analyzing for parent drugs or decomposition products like 2-phenylbutyric acid can improve accuracy.

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Area of Science:

  • Forensic Toxicology
  • Analytical Chemistry
  • Pharmacology

Background:

  • Barbiturates are commonly prescribed medications with a narrow therapeutic index, increasing the risk of fatal overdose.
  • Accurate detection of barbiturates is crucial in forensic investigations involving suspected suicides or homicides.

Purpose of the Study:

  • To investigate the stability of representative barbiturates under post-mortem and embalming conditions.
  • To identify potential decomposition products and assess their impact on analytical results.

Main Methods:

  • Studied the decomposition of phenobarbital, pentobarbital, and secobarbital in aqueous solutions.
  • Simulated post-mortem and embalming conditions, including varying pH and the presence of formaldehyde.
  • Identified decomposition products using analytical techniques.

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Main Results:

  • Phenobarbital demonstrated slow decomposition in water (pH 3.5-9.5), with accelerated rates at higher pH and in the presence of formaldehyde (5-20%).
  • 2-phenylbutyric acid was identified as the primary decomposition product of phenobarbital.
  • Pentobarbital decomposed significantly slower than phenobarbital, while secobarbital showed no detectable decomposition.

Conclusions:

  • Certain barbiturates, particularly phenobarbital, can decompose in vivo after death and during embalming, potentially causing false-negative results in toxicological analyses.
  • Analyzing for both the parent barbiturate and its predicted decomposition products can mitigate the risk of false negatives in forensic casework.