New device for direct extraction of volatiles in solid samples using SPME.

Area of Science:

• Food Chemistry
• Analytical Chemistry
• Material Science

Background:

• Solid-phase microextraction (SPME) is a common technique for volatile compound analysis.
• Traditional SPME methods often require extensive sample preparation, especially for solid matrices.
• Direct extraction of volatiles from solid food matrices remains a challenge.

Purpose of the Study:

• To design and evaluate a new device for direct volatile extraction from solid food materials using SPME.
• To compare the volatile profiles obtained with the new device against headspace SPME (HS SPME).
• To assess the efficiency and potential contaminants associated with the direct extraction method.

Main Methods:

• Development of a protective device for SPME fibers to enable direct insertion into solid food samples.
• Analysis of volatile compounds in dry-cured ham and canned liver sausage using the new device.
• Comparison of results with conventional headspace SPME (HS SPME) analysis.
• Identification of key volatile compounds, including lipid oxidation and Strecker degradation products, and terpenes.

Main Results:

• The new device successfully extracted volatiles from solid food matrices (dry-cured ham, canned liver sausage) without prior sample preparation.
• Volatile profiles obtained by direct extraction were highly similar to those from HS SPME.
• Key quality marker compounds were effectively extracted using the direct method.
• The direct extraction method avoided the co-extraction of laboratory contaminants, unlike HS SPME which showed solvent peaks.

Conclusions:

• The developed device offers a simplified approach for extracting volatiles from solid materials via SPME.
• This method has potential for routine analysis, reducing sample preparation time and avoiding laboratory contaminants.
• While effective, the direct sampling procedure exhibited higher coefficients of variation compared to HS SPME.