Extraction, derivatization, and analysis of vegetable oils from fire debris

Area of Science:

• Forensic Science
• Analytical Chemistry
• Fire Investigation

Background:

• Vegetable oils can self-heat and ignite, posing a risk in fire investigations.
• Traditional fire debris analysis methods are insufficient for detecting vegetable oils.
• A standardized protocol is needed for forensic casework involving suspected vegetable oil fires.

Purpose of the Study:

• To develop and optimize a protocol for extracting and analyzing vegetable oils from fire debris.
• To compare derivatization methods for converting fatty acids to fatty acid methyl esters (FAMEs).
• To evaluate different gas chromatography (GC) conditions for FAMEs separation and analysis.

Main Methods:

• Extraction of vegetable oils from various fire debris matrices.
• Comparison of three derivatization techniques to form fatty acid methyl esters (FAMEs).
• Optimization of gas chromatography (GC) columns and temperature programs for FAMEs analysis.

Main Results:

• An effective protocol for vegetable oil extraction and derivatization was established.
• Optimal GC conditions were identified for the separation and detection of FAMEs.
• The protocol demonstrated efficacy with both pure and burned vegetable oils on common debris materials.

Conclusions:

• The developed protocol provides a reliable method for identifying vegetable oils in fire debris.
• This research lays the groundwork for further studies on vegetable oils in forensic fire investigations.
• The findings will aid fire investigators in analyzing complex fire scenes involving suspected spontaneous combustion.