Rapid identification of color additives, using the C18 cartridge: collaborative study

Area of Science:

• Food Science
• Analytical Chemistry
• Regulatory Science

Background:

• FD&C color additives are crucial for food product appeal.
• Accurate identification and quantification of these additives are essential for regulatory compliance and consumer safety.
• Previous methods may have limitations in scope or efficiency.

Purpose of the Study:

• To collaboratively study and validate a method for separating and identifying permitted FD&C color additives (Red Nos. 3 and 40; Blue Nos. 1 and 2; Yellow Nos. 5 and 6; Green No. 3) and the banned FD&C Red No. 2 in foods.
• To assess the method's applicability across diverse food matrices and dye mixtures.
• To establish a reliable analytical procedure for food safety and regulatory purposes.

Main Methods:

• A collaborative study involving nine laboratories.
• Utilized a commercial C18 cartridge for sample preparation.
• Employed spectrophotometry and thin-layer chromatography for separation and identification.
• Analyzed five commercial food products and two specific dye mixtures.

Main Results:

• Eight of nine collaborating laboratories successfully identified all target FD&C color additives with minimal difficulty.
• The method demonstrated effectiveness in analyzing both commercial food products and complex dye mixtures.
• Accurate identification of permitted and banned FD&C colors was achieved.

Conclusions:

• The developed method is reliable and effective for the separation and identification of FD&C color additives in foods.
• The method's successful validation in a collaborative study supports its adoption for routine analysis.
• The method has been officially adopted as first action, indicating its readiness for regulatory use.