A comprehensive screen for volatile organic compounds in biological fluids.

Area of Science:

• Analytical Chemistry
• Forensic Science
• Biochemistry

Background:

• Volatile organic compounds (VOCs) in biological fluids are crucial biomarkers.
• Existing methods for VOC analysis can be time-consuming or lack comprehensive detection.
• A need exists for efficient and accurate screening of VOCs in biological samples.

Purpose of the Study:

• To develop and validate an expanded headspace gas chromatographic (GC) method for VOC analysis in biological fluids.
• To enhance the speed, sensitivity, and scope of VOC detection compared to previous methods.
• To assess the utility of the improved method in routine forensic casework.

Main Methods:

• Headspace gas chromatography (GC) utilizing DB-1 and DB-WAX columns with split injection.
• Analysis of over 40 common volatile organic compounds.
• Development of a control mixture for qualitative and semiquantitative assessment.
• Comparison with elution on a specialty DB-624 phase.

Main Results:

• Successful separation and identification of more than 40 VOCs in a single 20-minute run.
• Detection of commonly encountered VOCs at levels below 4 mg%.
• The method demonstrated ease of quantitation and suitability for routine use.
• The expanded screen proved advantageous in forensic casework within its first year.

Conclusions:

• The modified headspace GC method provides a rapid, sensitive, and comprehensive approach for VOC screening in biological fluids.
• This technique is well-suited for routine forensic applications, offering significant improvements over older methods.
• The method facilitates both qualitative and quantitative analysis of volatile compounds.