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Automated headspace solid-phase microextraction and capillary gas chromatography analysis of ethanol in postmortem
Bruno Spinosa De Martinis1, Carmen Cinira Santos Martin
1Department of Pathology, Faculty of Medicine of Ribeirão Preto, Center of Legal Medicine, University of São Paulo, Rua Tenente Catão Roxo 2418, Ribeirão Preto, São Paulo 14051-140, Brazil. martins@spider.usp.br
Forensic Science International
|August 15, 2002
Summary
This study introduces a new method for analyzing ethanol and volatile compounds in postmortem samples using headspace solid-phase microextraction (HS-SPME). The technique offers accurate and sensitive detection of alcohol in blood, urine, and vitreous humor.
Area of Science:
- Forensic Toxicology
- Analytical Chemistry
- Sample Preparation Techniques
Background:
- Solid-phase microextraction (SPME) is a solventless technique for sample preparation.
- Analysis of volatile compounds, including ethanol, is crucial in forensic toxicology.
- Limited literature exists on HS-SPME for alcohol analysis in postmortem vitreous humor, blood, and urine.
Purpose of the Study:
- To develop and validate a methodology for the analysis of ethanol and volatile compounds in postmortem specimens.
- To utilize automatic headspace solid-phase microextraction (HS-SPME) coupled with gas chromatography.
- To establish a sensitive and reliable method for forensic toxicological analysis.
Main Methods:
- Developed a methodology using automatic headspace solid-phase microextraction (HS-SPME).
- Employed capillary gas chromatography for separation and detection.
- Used standard solutions and postmortem samples (blood, urine, vitreous humor) with isobutanol as an internal standard.
Main Results:
- Optimized HS-SPME conditions ensured good separation of ethanol and isobutanol from potential interferents.
- Demonstrated good linearity for calibration curves across the concentration range of 0.001 to 1.0 g/dl.
- Achieved a low detection limit for ethanol in postmortem specimens, approximately 0.0001 g/dl.
Conclusions:
- The developed HS-SPME method is effective for analyzing ethanol and volatile compounds in postmortem samples.
- This technique provides a sensitive and reliable tool for forensic toxicology, particularly for alcohol analysis in vitreous humor.
- The methodology offers simultaneous sampling, extraction, pre-concentration, and introduction, simplifying the analysis process.