Two fatal intoxication cases with imidacloprid: LC/MS analysis

Area of Science:

• Forensic Toxicology
• Analytical Chemistry
• Environmental Science

Background:

• Imidacloprid is a widely used nitromethylene insecticide known for its high efficacy and neurotoxic action.
• It functions by blocking postsynaptic nicotinergic acetylcholine receptors, similar to nicotine.
• Understanding its toxicological profile in fatal exposures is crucial for forensic investigations.

Observation:

• The study details two fatal cases involving imidacloprid exposure in adult males.
• A liquid chromatography-electrospray ionization mass spectrometry (LC/MS) method was developed and validated for quantifying imidacloprid and its metabolites.
• The method demonstrated good linearity, recovery (86%), and a low detection limit (0.002 microg/mL).

Findings:

• The validated LC/MS method was successfully applied to various post-mortem matrices, including blood, urine, stomach contents, lung, liver, and kidney.
• Quantitative imidacloprid concentrations were determined in blood samples from the two cases (12.5 and 2.05 microg/mL).
• This research provides the first reported post-mortem tissue distribution data for imidacloprid.

Implications:

• The validated analytical method aids in the accurate detection and quantification of imidacloprid in forensic toxicology.
• The findings contribute to understanding the toxicokinetics and distribution of imidacloprid in fatal poisoning cases.
• This research is vital for establishing cause of death and improving risk assessment for neonicotinoid insecticides.