Analysis of furan and alkylfurans in food commodities using headspace SPME arrow and GC-MS

Importance of the Topic

Furan and its alkylated derivatives form during thermal processing of foods and are classified as potential carcinogens. Their volatility and ubiquitous presence in common commodities such as baby formula and coffee demand robust analytical methods to ensure consumer safety and compliance with regulatory limits.

Objectives and Study Overview

The study aimed to develop and optimize a headspace solid-phase microextraction (HS-SPME) arrow coupled with gas chromatography-mass spectrometry (GC-MS) workflow for sensitive quantitation of furan and five alkylfurans in infant formula and instant coffee. Key tasks included evaluating sample preparation, extraction parameters, and instrumental performance.

Methodology and Instrumentation

Sample Preparation

• Baby formula or coffee (0.5 g) was mixed with a defined volume of 30 % NaCl solution in headspace vials.
• Deuterated internal standards were spiked at known levels.
• Incubation at 50 °C with agitation (250 rpm) for 10 minutes preceded extraction.
• HS-SPME arrow (Carbon Wide Range coating) was exposed to vial headspace for 10 minutes.

Instrumental Analysis

• GC-MS system: Agilent 7890B GC coupled to 5977B MSD.
• Column: Rxi-624Sil MS, 30 m × 0.25 mm, 1.40 µm.
• Injection: split mode (1:10 for formula, 1:100 for coffee), desorption at 280 °C for 1 minute.
• Oven program: 35 °C (3 min), ramp to 75 °C at 8 °C/min, then to 200 °C at 25 °C/min.
• Detection: Electron ionization (70 eV), selected ion monitoring for targeted analytes and deuterated standards.

Main Results and Discussion

Comparison of extraction techniques demonstrated that the HS-SPME arrow provided highest peak areas and signal-to-noise ratios versus traditional fiber SPME and static headspace. Extraction at 50 °C for 10 minutes balanced sensitivity across the volatile series. Calibration in saline matrix exhibited good linearity across low (1.25–150 ng/vial) and high (25–8000 ng/vial) ranges. Recovery studies in baby formula showed accuracies of 87–113 % with RSDs below 4 %. In coffee, recoveries ranged from 83–125 % with RSDs under 11 %. A slight positive bias at high coffee spike level suggests further investigation into matrix handling.

Advantages and Practical Applications

• Enhanced sensitivity and reproducibility for trace volatile analysis.
• Robust SPME arrow format reduces fiber fragility and maintenance.
• Adaptable to routine quality control in food safety laboratories.

Future Trends and Potential Applications

Advances may include novel sorbent coatings for broader volatility ranges, automated sample-to-data workflows, and extension to emerging matrices such as plant-based products. Integration with high-resolution MS could further refine compound identification and quantitation.

Conclusion

The optimized HS-SPME arrow GC-MS method delivers reliable quantitation of furan and alkylfurans in complex food matrices with strong analytical performance. Continued refinement will address minor biases and expand applicability to diverse food safety challenges.

Reference

• Pawliszyn J. Handbook of Solid Phase Microextraction. Chemical Industry Press, Beijing 2009.
• Frank N, Dubois M, Huertas Pérez JF. Detection of Furan and five Alkylfurans, including 2-Pentylfuran, in various Food Matrices. J Chromatogr A. 2020;1622:461119.