Analysis of Synthetic Dye

Significance of the Topic

The accurate and efficient separation of synthetic dyes is critical for ensuring regulatory compliance and consumer safety in food and cosmetic products. Reversed-phase liquid chromatography provides a robust platform for the simultaneous analysis of structurally diverse color additives.

Objectives and Study Overview

This study demonstrates a rapid method for separating twelve common synthetic dyes using a Shim-pack NovaCore C18-HB column on a Nexera X3 system. Key goals include achieving baseline resolution in minimal analysis time and validating the approach for routine quality control.

Methodology and Instrumentation

• Chromatographic system: Nexera X3
• Column: Shim-pack NovaCore C18-HB (100 mm × 3.0 mm I.D., 2.6 µm)
• Mobile phase:
  • A: 20 mM ammonium acetate
  • B: Acetonitrile/Methanol (80/20, v/v)
• Gradient program: 5% B (0–5 min) → 95% B (5–7 min) → 5% B (7–15 min)
• Flow rate: 0.6 mL/min
• Column temperature: 40 °C
• Injection volume: 5 µL
• Detection: PDA at 254 nm

Main Results and Discussion

The optimized gradient yielded clear separation of twelve dyes within 7 minutes. Retention times increased in the order: Tartrazine, Amaranth, Indigo Carmine, New Coccine, Sunset Yellow FCF, Allura Red AC, Fast Green FCF, Brilliant Blue FCF, Erythrosine, Acid Red, Phloxine B, and Rose Bengal. Peak shapes were sharp, and resolution exceeded baseline criteria, highlighting the column’s efficiency and selectivity for polar and nonpolar colorants.

Advantages and Practical Applications

• High throughput: complete separation in under 7 minutes
• Reproducibility: consistent retention times and peak shapes
• Versatility: applicable to food, cosmetics, and environmental samples
• Regulatory compliance: supports color additive identification and quantification

Future Trends and Opportunities

• Integration with mass spectrometry for structural confirmation
• Development of greener mobile phases to reduce solvent consumption
• Automated data processing and multivariate analysis
• Expansion to novel and emerging colorants

Conclusion

The described reversed-phase LC method on Shim-pack NovaCore C18-HB delivers rapid, robust, and precise analysis of synthetic dyes. Its efficiency and reliability make it well-suited for routine quality control in food and cosmetic industries.

Reference

Shimadzu Corporation. ERAS-1000-0595. First Edition: March 2025. Analysis of Synthetic Dye using Shim-pack NovaCore C18-HB column on Nexera X3 system.