Pyridine ionic liquid functionalized bimetallic MOF solid-phase extraction coupled with high performance liquid...

Area of Science:

• Analytical Chemistry
• Materials Science
• Food Chemistry

Background:

• Sunset yellow is a widely used synthetic food dye.
• Accurate quantification of food additives is crucial for consumer safety.
• Developing efficient extraction and analysis methods for food dyes is an ongoing challenge.

Purpose of the Study:

• To establish an effective method for the separation and analysis of sunset yellow.
• To develop a novel solid-phase extractant for enhanced analyte recovery.
• To validate the method's performance for real-world food sample analysis.

Main Methods:

• Synthesis and characterization of pyridine ionic liquid functionalized bimetallic MOF (Cu/Co-MOF@[PrPy][Br]) using FTIR, XRD, SEM, and TEM.
• Optimization of solid-phase extraction parameters including pH, extractant amount, extraction time, and eluent type.
• High-performance liquid chromatography (HPLC) for the separation and quantification of sunset yellow.

Main Results:

• The developed Cu/Co-MOF@[PrPy][Br] extractant demonstrated effective separation and analysis of sunset yellow.
• Optimal conditions yielded a linear range of 0.05-40.00 μg mL⁻¹, a detection limit of 0.02 μg mL⁻¹, and excellent linearity (R² = 0.9992).
• Successful application of the method for sunset yellow determination in soda, effervescent tablets, and jelly samples.

Conclusions:

• The pyridine ionic liquid functionalized bimetallic MOF solid-phase extractant coupled with HPLC provides a simple, effective, and sensitive method for sunset yellow analysis.
• The characterized Cu/Co-MOF@[PrPy][Br] material shows significant potential for the analysis of food additives.
• This validated method is suitable for routine quality control and safety assessment of food products containing sunset yellow.