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Drug analysis in fly larvae

Z Wilson1, S Hubbard, D J Pounder

  • 1Department of Forensic Medicine, University of Dundee, Scotland.

The American Journal of Forensic Medicine and Pathology
|June 1, 1993
PubMed
Summary
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Forensic entomology can detect drugs in blow fly larvae, even if absent in adult flies. Larvae metabolize and excrete drugs, impacting their presence in forensic investigations.

Area of Science:

  • Forensic Entomology
  • Toxicology
  • Analytical Chemistry

Background:

  • Human skeletal muscle from overdose cases is a potential substrate for forensic entomology.
  • Drug presence in post-mortem tissues can be influenced by larval feeding and metabolism.

Purpose of the Study:

  • To investigate the detection of specific drugs (amitriptyline, propoxyphene, acetaminophen) in Calliphora vicina larvae fed on drug-laden human skeletal muscle.
  • To determine drug concentrations in larvae, puparia, and imagos, and compare them to the food source.

Main Methods:

  • Rearing of Calliphora vicina larvae on human skeletal muscle containing co-proxamol and amitriptyline.
  • Transfer of larvae to drug-free or continued exposure to drug-laden muscle.
  • Analysis of drug concentrations in larvae, puparia, and imagos using analytical chemistry techniques.

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Main Results:

  • Amitriptyline and its metabolite nortriptyline were detected in larvae regardless of continuous drug exposure.
  • Propoxyphene was detected only in larvae continuously fed drug-laden muscle; acetaminophen was not detected.
  • Drug concentrations varied significantly between larvae and the food source, with lower ratios for propoxyphene.
  • No drugs or metabolites were found in puparia or adult flies (imagos).

Conclusions:

  • The absence of a drug in adult flies does not preclude its presence in the larval feeding source.
  • Calliphora vicina larvae possess mechanisms (malpighian tubules, nephrocytes) for efficient drug elimination.
  • Larval drug metabolism and excretion are critical factors in forensic toxicological analysis.