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Related Concept Videos

Enhanced Elimination of Poison01:26

Enhanced Elimination of Poison

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Poison can be effectively removed from the gastrointestinal (GI) tract through various decontamination procedures.
Antidotes serve a crucial role in counteracting the effects of poison by inhibiting enzymes responsible for producing harmful drug metabolites. In some cases, these toxic metabolites can be neutralized by endogenous cosubstrates, which are maintained at specific concentrations to prevent interaction with cellular macromolecules and subsequent cell death.
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When toxic substances penetrate the human body, they disseminate to various tissues, undergoing metabolic changes. This process yields reactive metabolites that may covalently bind with specific target molecules, resulting in toxicity.
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Related Experiment Video

Updated: Dec 29, 2025

Multi-step Preparation Technique to Recover Multiple Metabolite Compound Classes for In-depth and Informative Metabolomic Analysis
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Method Consolidation to Improve Scope and Efficiency in Postmortem Toxicology.

Jirair Gevorkyan1, Megan Wong1, Sue Pearring1

  • 1Office of the Chief Medical Examiner, Forensic Laboratory Division, San Francisco, CA, USA.

Journal of Analytical Toxicology
|February 6, 2020
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Summary

A new liquid chromatography tandem mass spectrometry (LC-MS/MS) method enhances toxicology testing efficiency by consolidating multiple assays into one. This approach improves sensitivity, reduces sample volume, and significantly cuts down on staff time for drug abuse quantitation.

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Area of Science:

  • Forensic Toxicology
  • Analytical Chemistry
  • Mass Spectrometry

Background:

  • Traditional postmortem toxicology relied on gas chromatography-mass spectrometry (GC-MS), requiring multiple assays that were time-consuming and sample-intensive.
  • High prevalence of polypharmacy cases in modern toxicology strained existing GC-MS workflows, leading to productivity and turnaround time issues.
  • Legacy methods often lacked the sensitivity and scope to detect all relevant substances, potentially missing critical findings.

Purpose of the Study:

  • To develop and validate a consolidated, efficient, and sensitive analytical method for drug abuse quantitation in postmortem toxicology.
  • To improve toxicology testing efficiency by reducing sample volume, staff time, and resource utilization.
  • To enhance the comprehensive nature of toxicology testing for improved cause of death determinations.

Main Methods:

  • Consolidated seven legacy GC-MS methods into a single liquid chromatography-tandem mass spectrometry (LC-MS/MS) assay.
  • Utilized rapid acetonitrile protein crash extraction and in-vial filtration for sample preparation with approximately 100 μL of blood or urine.
  • Developed a validated LC-MS/MS method incorporating 55 analytes and automated data processing with customized acceptability criteria.

Main Results:

  • The new LC-MS/MS method demonstrated higher sensitivity and specificity compared to previous GC-MS assays, potentially identifying 41% more positive results.
  • Analyzed 1,389 samples (858 blood, 531 urine), with 11% of results falling outside the scope of prior analytical methods.
  • Reduced sample volume to 0.1 mL, decreased active staff time per case from over 30 hours to significantly less, and incorporated 10 additional analytes.

Conclusions:

  • The developed LC-MS/MS method offers a more comprehensive, efficient, and resource-sparing approach to postmortem drug abuse testing.
  • This streamlined method significantly improves throughput and quality assurance in toxicology laboratories.
  • The enhanced analytical capability better supports accurate cause of death investigations in complex cases.