Abnormally High Blood Acetaldehyde Concentrations Suggest Potential Postmortem Ethanol Generation

Area of Science:

• Forensic Toxicology
• Postmortem Chemistry
• Biomarker Discovery

Background:

• Ethanol abuse is a global issue, necessitating accurate determination of its origin in deceased individuals.
• Differentiating antemortem ethanol ingestion from postmortem generation is critical for forensic investigations and cause of death rulings.
• Putrefaction can lead to the endogenous synthesis of ethanol, complicating toxicological findings.

Purpose of the Study:

• To identify reliable biomarkers for distinguishing antemortem ethanol ingestion from postmortem ethanol formation in corpses.
• To evaluate the sensitivity of acetaldehyde and n-propanol as indicators of postmortem ethanol generation.
• To confirm existing biomarkers for antemortem ethanol ingestion.

Main Methods:

• Prospective statistical analysis of authentic forensic case samples.
• In vitro simulation experiments to replicate postmortem conditions.
• Measurement of ethanol, acetaldehyde, n-propanol, ethyl glucuronide, and ethyl sulfate concentrations in blood.

Main Results:

• Ethyl glucuronide and ethyl sulfate are confirmed as reliable biomarkers for antemortem ethanol ingestion.
• A blood acetaldehyde concentration exceeding 0.014 g/dL is proposed as a rational indicator of postmortem ethanol generation.
• Acetaldehyde demonstrates higher sensitivity than n-propanol for detecting postmortem ethanol formation.

Conclusions:

• Acetaldehyde is a more sensitive marker than n-propanol for identifying postmortem ethanol formation.
• The threshold of 0.014 g/dL for blood acetaldehyde can aid in suspecting postmortem ethanol generation.
• Accurate differentiation of ethanol sources improves the reliability of forensic death investigations.