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Release of tissue paraquat into formalin solution during fixation
1Department of Legal Medicine, College of Medicine, National Taiwan University, Taipei, Republic of China.
Journal of Forensic Sciences
|May 1, 1990
Summary
Paraquat can be released from formalin-fixed tissues into formalin solutions. Measuring paraquat in both tissues and formalin offers a more reliable assessment for forensic toxicology, especially when fresh samples are unavailable.
Area of Science:
- Forensic Toxicology
- Analytical Chemistry
- Pathology
Background:
- Formalin-fixed tissues and solutions are common in labs but rarely used for poison identification.
- Paraquat identification in forensic samples is crucial for intoxication cases.
Observation:
- Formaldehyde interferes with paraquat determination using the dithionite reagent.
- Paraquat can leach from fixed tissues into formalin solutions over time.
Findings:
- A novel method using ion-pair column chromatography and derivative spectrophotometry successfully eliminated formaldehyde interference.
- Paraquat was detected in formalin solutions from fixed organs in suspected intoxication cases.
- Paraquat levels in formalin increased with longer storage times.
Implications:
- Combined analysis of paraquat in formalin-fixed tissues and solutions provides a more accurate measure of total postmortem paraquat.
- This method enhances paraquat detection in forensic toxicology, particularly when fresh tissues are absent.