EU Compliant Routine Quantitative Dioxin and Dioxin-like compounds in food and feed by GC-MS/MS with the Advanced Ionization Source

Importance of the Topic

Dioxins (PCDDs, PCDFs) and dioxin-like PCBs are persistent organic pollutants with high toxicity that bioaccumulate in animal fat. Dietary intake accounts for over 90% of human exposure, making accurate monitoring in food and feed essential for regulatory compliance and public health protection.

Objectives and Study Overview

This study validates an EU-compliant GC-MS/MS method using the Thermo Scientific TSQ 9000 with Advanced Electron Ionization source. It aims to demonstrate compliance at one-fifth of maximum levels, assess method robustness over extended sequences, and evaluate inter-laboratory performance across sites in the UK, US, and China.

Methodology and Instrumentation

• Hardware: Thermo Scientific TSQ 9000 triple quadrupole GC-MS/MS with Advanced EI source; TRACE 1310 GC with large-volume PTV injector;
• MS Conditions: EI at 350 °C, timed SRM acquisition, Argon collision gas, unit mass resolution Q1/Q3;
• Sample Preparation: Hot extraction (Twisselmann or ASE) followed by automated three-column cleanup (acidic silica, alumina, carbon) on DEXTech Plus;
• Calibration: EN 1948 standard solutions covering five orders of magnitude for PCDD/Fs and PCBs; duplicate injections per level;
• Data Processing: Thermo Scientific Chromeleon CDS with preloaded acquisition, processing, and reporting templates.

Main Results and Discussion

• Chromatography: Achieved >25% valley between critical HxCDF isomers per EU criteria;
• LOQ: 10 fg to 160 fg on-column with stable retention times (±0.1 min), ion ratios within ±15%, and RF RSD <6%;
• Linearity: R² >0.996 across congeners;
• Accuracy: Strong correlation (r>0.99) with reference WHO-TEQ values for PCDD/Fs and dioxin-like PCBs in diverse food/feed matrices;
• Precision: Mixed-fat QC replicates showed RSD ~2.7% over 14 injections on two instruments;
• Robustness: 160-injection sequence over two weeks without maintenance, with consistent performance.

Benefits and Practical Applications

• Ready-to-use deployment guide and consumables for six months of continuous operation;
• Regulatory compliance for confirmatory dioxin/PCB testing in routine labs;
• Streamlined workflow with pre-loaded methods in Chromeleon CDS for rapid data review and reporting;
• High uptime and minimal downtime thanks to advanced ionization and user-exchangeable modules.

Future Trends and Applications

• Further integration of advanced ion sources and automation to enhance sensitivity and reduce maintenance;
• Expansion of validated workflows to emerging persistent and semi-volatile contaminants;
• Cloud-based method sharing and AI-driven diagnostics via online platforms (AppsLab library);
• Development of rapid extraction and miniaturized cleanup techniques for higher throughput.

Conclusion

The TSQ 9000 GC-MS/MS with Advanced Ionization Source offers a robust, sensitive, and user-friendly solution for routine quantification of dioxins and dioxin-like PCBs in food and feed, fully meeting EU requirements and delivering outstanding uptime and reproducibility.

Reference

• European Commission Regulation (2014) on maximum levels of PCDD/Fs and PCBs in food and feed
• EN 1948: European method for PCDD/F analysis
• Thermo Fisher Scientific Application Note: EU Compliant Routine Quantitative Dioxin and Dioxin-like compounds in food and feed by GC-MS/MS with the Advanced Ionization Source