Postmortem Toxicology and Redistribution Mechanisms
Summary
Postmortem toxicology examines the presence and concentrations of xenobiotics in biological specimens to determine cause and manner of death. A principal challenge is postmortem redistribution, a process by which drugs diffuse from reservoirs in solid organs into surrounding tissues and blood after death. Factors such as the physicochemical properties of the compound (lipophilicity, acid–base character, protein binding and volume of distribution), cadaveric changes (cell lysis, blood coagulation, hypostasis and putrefaction) and the length of the postmortem interval all influence measured concentrations. Sampling site and choice of biological matrix are critical: peripheral blood is preferred to minimise central redistribution, while alternative matrices such as vitreous humour, muscle or bone may offer greater stability. Analytical methods, typically involving chromatographic separation coupled with tandem mass spectrometry, must contend with matrix effects and evolving decomposition products. Understanding redistribution mechanisms underpins accurate interpretation of toxicological results, informs legal enquiries and guides best practice in forensic investigations worldwide.
Research from Nature Portfolio
Recent work has established robust gas chromatography–mass spectrometry protocols to elucidate the toxicokinetics and postmortem redistribution of difenidol hydrochloride in animal models. Time-course studies demonstrated that organ concentrations peak at intervals reflecting absorption and distribution, with highest levels in tissues proximal to the gastrointestinal tract. Subsequent decline and redistribution into central blood compartments were quantified, confirming marked postmortem shifts. Preservation experiments under varied temperature and additive conditions revealed the stability of difenidol in blood samples over several weeks, providing a validated framework for sample storage and interpretation in forensic casework.
Postmortem Toxicology and Redistribution Mechanisms publication trend
The graph below shows the total number of articles in postmortem toxicology and redistribution mechanisms across all publications each year (not limited to Nature Index journals).
Technical terms
Postmortem redistribution (PMR): Alteration in drug concentrations within tissues and blood after death due to passive diffusion and decomposition processes.
Toxicokinetics: The study of a substance’s absorption, distribution, metabolism and excretion in an organism.
Biological matrix: A body fluid or tissue (e.g. blood, vitreous humour, muscle) used for chemical analysis.
Volume of distribution: A pharmacokinetic parameter reflecting the extent to which a drug disperses into body compartments.
Liquid chromatography–tandem mass spectrometry (LC–MS/MS): An analytical technique combining liquid chromatography separation with mass spectrometric detection for precise quantification of compounds in complex samples.
References
- A Tissue Distribution Study of Propafenone in an Intentional Fatal Poisoning Case. International Journal of Molecular Sciences (2024).
- Forensic toxicokinetics of difenidol hydrochloride in vivo verified by practical lethal cases. Scientific Reports (2023).
- Vitreous humor analysis for the detection of xenobiotics in forensic toxicology: a review. Forensic Toxicology (2015).
- Postmortem redistribution of drugs: a literature review. Forensic Science, Medicine and Pathology (2023).
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