Overview
Tartrazine is one of the most widely used synthetic food colorants, first patented in 1884 and approved for food use in the US since 1916. As an azo dye (containing -N=N- groups), it produces a bright lemon-yellow hue that remains stable under most processing conditions. Its high tinctorial strength allows effective coloring at low concentrations (typically 0.001-0.1% in finished products). The dye is manufactured through a multi-step synthesis involving sulfonation and diazotization reactions. Industrial production must meet strict purity standards, with limits on subsidiary colors and uncombined intermediates. Major global producers are located in China, India, and Europe.
Physical and Chemical Properties
Tartrazine exhibits excellent water solubility due to its polar sulfonate groups, forming clear yellow solutions. The color intensity remains stable across a broad pH range (3-9), making it suitable for acidic beverages and neutral baked goods alike. Unlike some natural colorants, it demonstrates remarkable resistance to heat (stable up to 105°C) and light exposure. Chemically, the compound is classified as a trisodium salt with three ionic groups that influence its behavior in solution. Its absorption maximum occurs at 428 nm in water, producing the characteristic yellow shade. The dye shows minimal interactions with most food components but may precipitate in the presence of certain cations like calcium if not properly formulated.
Main Applications
In the food industry, tartrazine colors products ranging from soft drinks and sports beverages to candies, ice cream, and processed snacks. It's particularly valued in lemon-flavored products where its hue matches consumer expectations. Pharmaceutical applications include coating tablets and coloring medicinal syrups for easy identification. The cosmetic industry utilizes tartrazine in products like shampoos, soaps, and bath products where a bright yellow color is desired. Industrial uses extend to paper coloring and textile dyeing, though these represent smaller market segments. When combined with blue dyes like Brilliant Blue FCF, it creates various green shades for product differentiation.
Safety and Storage
While tartrazine is generally recognized as safe (GRAS) by the FDA, some individuals experience hypersensitivity reactions including urticaria and asthma. The EU requires warning labels ("may have an adverse effect on activity and attention in children") on products containing this dye. Proper storage involves keeping containers tightly sealed in cool, dry conditions away from strong oxidizing agents. Bulk quantities should be protected from moisture absorption and contamination. Industrial users should implement dust control measures during handling, as the fine powder can become airborne. Shelf life typically exceeds 24 months when stored correctly, with minimal degradation over time.
B2B Procurement Guide
Industrial buyers should specify whether they require food-grade (FCC/JP/EP standards), cosmetic-grade, or technical-grade material. Key procurement considerations include batch-to-batch consistency, certification of analysis documentation, and supplier compliance with relevant regulations (FDA, EU, JECFA specifications). For large-scale purchases (500kg+), negotiate pricing based on purity (typically 85-95%) and packaging options (25kg fiber drums vs. bulk bags). Verify the supplier's quality control processes for heavy metal content (lead <10 ppm, arsenic <3 ppm) and subsidiary dyes. Some manufacturers offer custom blends with other colorants for specific application needs.
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