Yellow 6 lake is a synthetic yellow colorant approved for use in food, drugs, and cosmetics [1]. It is a precipitated form of FD&C Yellow No. 6 (also known as sunset yellow FCF) [2]. This lake pigment is created by adsorbing the soluble dye FD&C Yellow No. 6 onto a substrate, typically alumina hydrate, and then drying and milling it [3]. The resulting insoluble powder is used to impart a yellow hue [4].
What is FD&C Yellow No. 6 and how is it different from Yellow 6 lake?
FD&C Yellow No. 6, or sunset yellow FCF, is a water-soluble azo dye [2]. It is widely used as a colorant in various products. Yellow 6 lake is derived from FD&C Yellow No. 6. The "lake" designation signifies that the soluble dye has been rendered insoluble by combining it with a substratum, such as alumina hydrate. This process makes the colorant suitable for applications where solubility is not desired, such as in tablet coatings or oil-based products [3][4].
Where can Yellow 6 lake be found?
Yellow 6 lake is utilized in a range of products. In the food industry, it can be found in candies, baked goods, beverages, and cereals [4]. In pharmaceuticals, it is used as a colorant for tablets and capsules [2]. Its application extends to cosmetics, where it may be used in makeup products [1].
Are there any safety concerns or regulations regarding Yellow 6 lake?
The use of Yellow 6 lake, like other synthetic colorants, is subject to regulation by bodies such as the U.S. Food and Drug Administration (FDA) [1]. The FDA has established specifications for its purity and permissible uses [3]. While generally recognized as safe when used within approved limits, some individuals may experience adverse reactions, such as allergic responses or hypersensitivity, particularly in children [5]. Concerns have been raised in some studies linking certain synthetic food colorings, including those derived from sunset yellow, to hyperactivity in children, though regulatory bodies have generally found the evidence to be insufficient to warrant bans [6].
What are the chemical properties of Yellow 6 lake?
Yellow 6 lake is an organic compound with a chemical formula based on its parent dye, FD&C Yellow No. 6 (C16H10N2Na2O7S2) [2]. As a lake pigment, it is characterized by its insolubility in water and oil, which is a result of its adsorption onto an inert inorganic substrate like alumina [3][4]. This insolubility is key to its use in applications where bleeding or dissolving is not desirable.
How is Yellow 6 lake manufactured?
The manufacturing process for Yellow 6 lake involves the chemical synthesis of FD&C Yellow No. 6, followed by a laking process [3]. In the laking process, the soluble FD&C Yellow No. 6 is treated with a precipitating agent, often a calcium or aluminum salt, and adsorbed onto a substrate such as alumina hydrate. This results in an insoluble pigment that is then filtered, washed, dried, and milled to a fine powder [4].
What are the alternatives to Yellow 6 lake?
Alternatives to Yellow 6 lake include other synthetic colorants or natural colorants [7]. Other synthetic yellow dyes and lakes are available, each with different chemical properties and regulatory approvals. Natural yellow colorants derived from sources like turmeric (curcumin), annatto, or saffron can also be used, offering a different profile of stability, hue, and cost [8]. The choice of alternative often depends on the specific application requirements, regulatory considerations, and consumer preferences for natural ingredients.
What is the regulatory status of Yellow 6 lake in different regions?
The regulatory status of Yellow 6 lake can vary by region. In the United States, it is approved by the FDA for use in food, drugs, and cosmetics [1]. In the European Union, it is listed as E110 (Sunset Yellow FCF) and its use is permitted, but with labeling requirements and restrictions in certain food categories [9]. Other countries have their own food additive regulations that may permit or restrict its use.
What are the main applications of Yellow 6 lake in the pharmaceutical industry?
In the pharmaceutical industry, Yellow 6 lake serves as a colorant primarily for solid dosage forms, such as tablets and capsules [2]. It is used to provide a distinct yellow color, which can aid in product identification, differentiation between different strengths or formulations, and aesthetic appeal [4]. Its insolubility is advantageous in preventing dye migration within the tablet or capsule.
Sources:
[1] https://www.fda.gov/
[2] https://www.drugpatentwatch.com/
[3] https://www.fda.gov/food/food-ingredients-packaging/fdc-approved-color-additives-table
[4] https://www.sciencedirect.com/topics/food-science/yellow-6-lake
[5] https://pubmed.ncbi.nlm.nih.gov/19878892/
[6] https://www.efsa.europa.eu/en/efsajournal/pub/3270
[7] https://www.sciencedirect.com/topics/food-science/natural-colorants
[8] https://www.sciencedirect.com/topics/food-science/curcumin
[9] https://www.foodstandards.gov.au/food-standards-code/Pages/default.aspx