Fast Determination of Acrylamide in Food Samples Using Accelerated Solvent Extraction Followed by Ion Chromatography with UV or MS Detection

Significance of the Topic

Objectives and Study Overview

Methodology

• Sample Preparation: 5 g of homogenized food loaded into ASE cells.
• Extraction Solvents: Pure water, water with 10 mM formic acid, and acetonitrile evaluated.
• ASE Conditions: 80 °C, 1500 psi, 5 min heat-up, three 4 min static cycles, 60% flush volume, 120 s nitrogen purge.
• Extract Handling: Filtration through a 0.22 μm nylon membrane; direct injection without additional cleanup.

Used Instrumentation

• Accelerated Solvent Extractor: Thermo Scientific Dionex ASE 100/200 with 33–34 mL extraction cells.
• Ion Chromatograph: Thermo Scientific Dionex DX-600 with GS50 gradient pump and AS50 autosampler.
• Analytical Column: Dionex IonPac ICE-AS1 (4 × 250 mm, 7.5 μm).
• Detectors: PDA-100 UV detector (202 nm) and Thermo Scientific MSQ single quadrupole mass spectrometer (ESI+).
• Software: Dionex Chromeleon 6.40 for system control and data acquisition.

Main Results and Discussion

• Extraction Efficiency: 95% recovery in the first cycle using 10 mM formic acid; an additional 8% recovered in a second cycle.
• Sensitivity and Linearity: Calibration from 0.01 to 10 mg/L with r2 ≥ 0.996; detection limits below 50 μg/kg in food matrices.
• Chromatographic Performance: Effective retention of acrylamide on ion-exclusion column, minimizing coextractable interferences.
• Sample Data: Potato chips contained 1.57 mg/kg by UV and 1.06 mg/kg by MS; crisp bread showed 0.08 mg/kg by MS; other samples ranged from non-detectable to 0.11 mg/kg.

Benefits and Practical Applications

• Speed: Complete extraction and analysis in under 20 minutes per sample.
• Automation: Minimal manual steps enable high-throughput screening.
• Versatility: Robust performance across diverse food types.
• Dual Detection: UV detection offers simplicity; MS detection provides enhanced specificity and confirmation.

Future Trends and Applications

• Extension to additional food contaminants and environmental analytes.
• Integration with tandem mass spectrometry (MS/MS) for improved selectivity and lower detection limits.
• Development of greener extraction solvents and miniaturized ASE formats.
• On-line monitoring in food processing for real-time quality control.

Conclusion

References

• Tareke E.; Ryberg P.; Karlsson P.; Eriksson S.; Tornqvist M. J. Agric. Food Chem. 2002, 50, 4998–5006.
• U.S. EPA Method 8032A; SW-846 Rev 1; 1996.
• BgVV Information Seminar on Acrylamide in Food; 2002.
• Richter B.E.; Jones B.A.; Ezzell J.L.; Porter N.L.; Avdalovic N.; Pohl C. Anal. Chem. 1996, 68, 1033.