Abstract
In postmortem examinations, the drug analysis of hair is effective for revealing drug-use history. Additionally, a method to estimate the day of death using hair was previously developed by analyzing a single hair strand segmented at 0.4-mm intervals (micro-segmental hair analysis). However, for drowned bodies, drugs in the hair may be washed out due to soaking in water for extended periods. To evaluate the possibility of measuring drug distribution in the hair of drowned bodies, drug stability in hair samples soaked in various aqueous solutions was examined. First, reference hair strands of drug users containing specific drugs consistently along the hair shaft were prepared. The participants ingested 4 hay-fever medicines (fexofenadine, epinastine, cetirizine, and loratadine) every day for approximately 4 months before hair collection. Each reference strand was divided into regions, and each region was soaked in different solutions containing various solutes for extended periods up to approximately 2 months. In solutions without divalent ions (Ca2+ and Mg2+), the drug content in the hair decreased up to approximately 5 % with increasing salt concentration and soaking time. However, the decreased drug content was negligible in solutions containing divalent ions, implying that the divalent ions prevented drugs contained in hair from washing out. As natural river and sea waters contain divalent ions, the drugs in hair were hardly washed out even when the hair was soaked for 2 months. Thus, it was concluded that drug-distribution measurements using micro-segmental analysis can also be applied to the hairs of drowned bodies.
Highlights
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Drug stabilities in hair soaked in various aqueous solutions were examined.
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Drug concentrations in hair decreased depending on solutes and soaking time.
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Divalent ions, such as Ca2+ and Mg2+, prevent drugs from being washed out.
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River and sea waters hardly affected the drug contents in hair.
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Micro-segmental analysis is effective even for hair of drowned bodies.
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Abbreviations
- FX:
-
Fexofenadine
- EN:
-
Epinastine
- CT:
-
Cetirizine
- CP :
-
Chlorpheniramine
- DLR:
-
Desloratadine
- EDTA:
-
Ethylenediamine-N,N,N′,N′-tetraacetic acid
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This work was supported by JSPS KAKENHI grant number 19K10700.
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Conceptualization: Kenji Kuwayama, Hajime Miyaguchi, Tatsuyuki Kanamori, Kenji Tsujikawa, Tadashi Yamamuro, Hiroki Segawa, Yuki Okada, Yuko T. Iwata; methodology: Kenji Kuwayama, Hajime Miyaguchi; formal analysis and investigation: Kenji Kuwayama; writing — original draft preparation: Kenji Kuwayama; writing — review and editing: Kenji Kuwayama, Yuko T. Iwata; supervision: Yuko T. Iwata.
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Kuwayama, K., Miyaguchi, H., Kanamori, T. et al. Possibility of drug-distribution measurement in the hair of drowned bodies: evaluation of drug stability in water-soaked hair using micro-segmental analysis. Int J Legal Med 137, 89–98 (2023). https://doi.org/10.1007/s00414-022-02900-3
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DOI: https://doi.org/10.1007/s00414-022-02900-3