Purity of standardized textile dye allergens: a thin layer chromatography study

Area of Science:

• Analytical Chemistry
• Dermatology
• Textile Science

Background:

• Textile dyes are widely used in the clothing industry.
• Some textile dyes can cause allergic reactions in individuals.
• Accurate identification of dye composition is crucial for allergy diagnosis.

Purpose of the Study:

• To analyze the purity of standard textile dyes.
• To compare the purity of dyes with identical Colour Index numbers or registration codes.
• To assess the relevance of standard textile dye allergens for patch testing.

Main Methods:

• Thin layer chromatography (TLC) was employed for dye analysis.
• Twelve standard textile dyes were analyzed.
• Comparative study with chemically similar dyes sharing the same Colour Index or registration code.

Main Results:

• Disperse Yellow 3, Disperse Orange 1, Disperse Orange 3, and Disperse Orange 13 appeared pure in the tested solvent system.
• Other analyzed textile dyes showed impurities under the same chromatographic conditions.
• Standard textile dye allergens demonstrated similarity to dyes commonly found in apparel.

Conclusions:

• The purity of textile dyes can vary, even among those with the same identification codes.
• Impurities in textile dyes may be relevant for allergic contact dermatitis.
• Standard textile dyes could be valuable in patch testing, but differences from actual textile exposures should be considered.