Products Azo dyes are available as pure substances in specialized trade. The first representatives were synthesized in the 19th century. Today, they are among the most important dyes worldwide. Structure and properties Azo dyes contain the following general structural element and chromophore, which is called an azo group or azo bridge. R1 and R2 are … Azo Dyes
Products Azorubin is available in powder form at specialty stores. Structure and properties Azorubin (C20H12N2Na2O7S2, Mr = 502.4 g/mol) belongs to the azo dyes. It is a naphthalenesulfonic acid. Azorubine is produced synthetically (artificially) and exists as a sodium salt and reddish-brown crystalline powder that is soluble in water. Azorubin is structurally closely related to … Azorubin
Products Tartrazine is available as a powder in specialized stores. Structure and properties Tartrazine (C16H9N4Na3O9S2, Mr = 534.4 g/mol) belongs to the azo dyes. It is a benzenesulfonic acid and a pyrazolone derivative present as a sodium salt. Tartrazine is an orange powder that is highly soluble in water. It is produced synthetically (artificially). It … Tartrazine
Which dyes are used? Coloring agents that are also used as food additives (E-numbers) are usually used for medicines. Which colorants are permitted depends on the legislation of the relevant countries. For Switzerland, the specifications published in the Medicines Approval Ordinance (AMZV), in Pharmacopoea Helvetica and in the Additives Ordinance apply. The following list shows … Dyes in Medicines