Separation and Quantification of 13 Synthetic Dyes in Foods Using the ACQUITY UPLC H-Class System

Importance of the Topic

Color additives play a vital role in food quality and consumer appeal, but synthetic dyes can pose health risks and are strictly regulated. Rapid, comprehensive monitoring is essential to ensure compliance and protect public health.

Goals and Study Overview

The objective was to develop a fast, robust reversed-phase UPLC method for the simultaneous separation and quantification of 13 permitted and non-permitted synthetic dyes in food products, achieving analysis in under eight minutes.

Methodology and Instrumentation

• Instrumentation: Waters ACQUITY UPLC H-Class System with PDA detector
• Column: ACQUITY UPLC BEH C18 2.1×100 mm, 1.7 µm
• Mobile phase: Gradient of 30 mM ammonium acetate, methanol, and acetonitrile using quaternary pumping
• Detection: PDA acquisition at 400 nm (yellow dyes), 500 nm (orange/red), and 630 nm (green/blue); spectral library for compound confirmation

Main Results and Discussion

The method achieved baseline separation of all 13 dyes in less than eight minutes. Calibration curves over 2–40 µg/mL exhibited excellent linearity (r² > 0.999). Example calibration for P4R (500 nm) and Brilliant Black (630 nm) demonstrated high sensitivity and reproducibility.

Benefits and Practical Applications

• High-throughput analysis with single injection for multiple dyes
• Reduced solvent preparation due to quaternary mixer
• Improved laboratory productivity and cost efficiency
• Applicable for routine food safety and QA/QC monitoring

Future Trends and Opportunities

Advancements may include integration with mass spectrometry for structural confirmation, expansion of spectral libraries for emerging dyes, automated sample preparation, and application to complex food matrices to further enhance regulatory compliance and analytical accuracy.

Conclusion

This UPLC-PDA method offers a fast, reliable, and comprehensive solution for monitoring synthetic food dyes, supporting regulatory compliance and safeguarding consumer health.

Used Instrumentation

• Waters ACQUITY UPLC H-Class System with PDA detector
• ACQUITY UPLC BEH C18 2.1×100 mm, 1.7 µm column