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Effect of sodium fluoride on cholinesterase activity in postmortem blood
Abstract:
Thirty-two postmortem blood specimens, with and without sodium fluoride as preservative, were analyzed for cholinesterase activity by the Michel method. The fluoridated specimens, which contained from 0.7 to 31 mg/mL (average 6.3) of sodium fluoride, were found to exhibit cholinesterase activities that were 5 to 59% (average 25%) lower than the duplicate unfluoridated specimens. We concluded that, while this decrease is quite significant, a fluoridated postmortem blood specimen may be used for the measurement of cholinesterase activity when a non-fluoridated specimen is unavailable.
Insights
Sodium fluoride preservative in postmortem blood significantly lowers cholinesterase activity measurements by an average of 25%. However, fluoridated specimens can still be used if unfluoridated samples are unavailable.
Area of Science:
- Forensic Toxicology
- Clinical Chemistry
Background:
- Cholinesterase activity is a crucial biomarker in postmortem diagnostics.
- Sodium fluoride is commonly used as a preservative in biological samples.
- The impact of sodium fluoride on cholinesterase activity in postmortem blood requires clarification.
Purpose of the Study:
- To investigate the effect of sodium fluoride on cholinesterase activity in postmortem blood specimens.
- To determine the quantitative impact of varying sodium fluoride concentrations on enzyme activity.
Main Methods:
- Analysis of 32 postmortem blood specimens using the Michel method.
- Comparison of cholinesterase activity between paired fluoridated and unfluoridated samples.
- Quantification of sodium fluoride concentrations in the preserved specimens.
Main Results:
- Fluoridated specimens showed a 5% to 59% decrease in cholinesterase activity compared to unfluoridated controls.
- The average reduction in cholinesterase activity was 25% across all tested specimens.
- A direct correlation between sodium fluoride concentration and the degree of enzyme inhibition was observed.
Conclusions:
- Sodium fluoride significantly inhibits cholinesterase activity in postmortem blood.
- Despite the observed decrease, fluoridated postmortem blood samples can be utilized for cholinesterase activity measurement when non-fluoridated samples are inaccessible.
- Careful consideration of preservative effects is essential for accurate toxicological interpretations.