Forensic Ethanol Analysis in Biological Samples
Summary
Ethanol analysis in biological samples underpins forensic investigations from impaired-driving cases to postmortem examinations. Accurate quantification and source attribution—distinguishing antemortem ingestion from postmortem microbial formation—depend on robust sampling protocols, appropriate choice of matrices such as blood, vitreous humour, cerebrospinal fluid or insect larvae, and advanced analytical techniques. Headspace gas chromatography with flame ionisation or mass spectrometric detection remains the gold standard for determining blood alcohol concentration, while liquid chromatography–mass spectrometry enables the detection of non-volatile biomarkers such as ethyl glucuronide and ethyl sulfate, extending detection windows and strengthening evidentiary weight. Investigations of congener alcohols and higher alcohol modelling have improved interpretation of microbial neoformation, and the integration of novel matrices and biomarkers is enhancing reliability in degraded or decomposed specimens. Consensus guidelines on sample collection, storage, and validation criteria support the harmonisation of forensic protocols worldwide, ensuring that results withstand legal scrutiny and inform judicial outcomes.
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Research from all publishers
Recent studies have advanced understanding of microbial ethanol production and biomarker analysis in challenging forensic contexts. A 2024 investigation into bacterial and fungal culture models applied mathematical frameworks to estimate postmortem ethanol by correlating higher alcohol profiles with microbial activity, demonstrating the utility of distinct species-specific models in routine autopsy blood analysis. Complementary work has validated an ultra high-performance liquid chromatography–high resolution mass spectrometry method for detecting ethyl glucuronide in insect larvae recovered from decomposed remains, offering an alternative matrix when traditional fluids are unavailable. Additionally, assessments of cerebrospinal fluid collected from the spinal canal have confirmed strong correlation with blood ethanol levels, establishing cerebrospinal fluid as a reliable substitute matrix in cases where putrefaction limits blood sample integrity.
Forensic Ethanol Analysis in Biological Samples publication trend
The graph below shows the total number of articles in forensic ethanol analysis in biological samples across all publications each year (not limited to Nature Index journals).
Technical terms
Headspace gas chromatography (HS-GC): Analytical technique separating volatile compounds by sampling the gas phase above a liquid or solid sample, often coupled with flame ionisation or mass spectrometric detection.
Ethyl glucuronide (EtG): A non-volatile phase II metabolic biomarker of ethanol consumption detectable in biological matrices beyond the alcohol elimination window.
Putrefactive neoformation: Microbial generation of endogenous ethanol and higher alcohols in decomposing tissue, complicating interpretation of postmortem blood alcohol concentration.
Cerebrospinal fluid (CSF): Sterile fluid in the spinal canal used as an alternative biological matrix for toxicological analysis when blood quality is compromised.
References
- Ethanol and Higher Alcohols’ Production in Fungal and Bacterial Laboratory Cultures and Significance for Forensic Samples. Microorganisms (2024).
- Validation of a new method for the detection of Ethyl glucuronide in larvae of Lucilia sericata as a marker of ante-mortem alcohol consumption. Heliyon (2023).
- Assessing the applicability of cerebrospinal fluid collected from the spinal cord for the determination of ethyl alcohol in post-mortem toxicology. Forensic Science, Medicine and Pathology (2022).
- Validation of a Headspace Gas Chromatography with Flame Ionization Detection Method to Quantify Blood Alcohol Concentration (BAC) for Forensic Practice. Chemosensors (2024).
- Guidelines for Collection of Biological Samples for Clinical and Forensic Toxicological Analysis. Forensic Sciences Research (2016).
- Modeling Postmortem Ethanol Production/Insights into the Origin of Higher Alcohols. Molecules (2022).
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