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Related Experiment Videos

Experimental studies on postmortem diffusion of ethanol-d6 using rats

T Takayasu1, T Ohshima, N Tanaka

  • 1Department of Legal Medicine, Kanazawa University School of Medicine, Japan.

Forensic Science International
|December 29, 1995
PubMed
Summary

Postmortem ethanol diffusion into tissues varies with temperature and time. Careful assessment of ethanol concentration in autopsy cases is crucial, considering stomach alcohol content.

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Area of Science:

  • Forensic Toxicology
  • Postmortem Biochemistry

Background:

  • Ethanol distribution in postmortem samples is critical for forensic investigations.
  • Understanding diffusion dynamics aids in interpreting blood alcohol content (BAC) in deceased individuals.

Purpose of the Study:

  • To investigate postmortem ethanol diffusion from the stomach into various tissues and body fluids.
  • To evaluate the influence of temperature and time on ethanol distribution after death.

Main Methods:

  • Deuterium-labeled ethanol-d6 was instilled into the stomach of rat carcasses immediately after death.
  • Carcasses were stored at 5°C or 30°C for 12-72 hours.
  • Heart blood, abdominal fluid, and tissues were analyzed using headspace gas chromatography-mass spectrometry.

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Main Results:

  • Ethanol-d6 diffused into neighboring abdominal organs, with peak concentrations varying by temperature and time.
  • Skeletal muscle showed delayed ethanol detection, and brain/thoracic organs suggested diffusion from the upper digestive tract.
  • Postmortem ethanol production at 30°C after 24 hours was comparable to previous studies.

Conclusions:

  • Postmortem ethanol diffusion is significantly influenced by temperature and postmortem interval.
  • The origin of ethanol in certain tissues (brain, thoracic cavity) may be external diffusion, not solely postmortem production.
  • Accurate interpretation of ethanol levels in forensic cases requires careful consideration of stomach contents and environmental factors.