Soviet Medical Encyclopedia

Indophenols

Chemistry & Physics

Also known as: Indophenol Blue, Indophenol White, Indophenol Synthesis

Historical document, translated for reference. It reflects medical knowledge of the 1920s–30s and is not medical advice.

Summary

Indophenols are dyes produced by the simultaneous oxidation of p-diamines and phenols. They resemble indigo in dyeing properties and are sold as Indophenol Blue N (C6H5)2N2 in a blue paste or brown powder, insoluble in water but soluble in alcohol with a blue color.

Encyclopedia entry (1928–1936)

Indophenols, dyes obtained by the simultaneous oxidation of p-diamines and phenols. They are similar in dyeing properties to indigo. In sale is found Indophenol Blue N (C6H5)2N2 in the form of a blue paste or brown powder, insoluble in water but soluble

Indophenols: figure 1 from the 1928–1936 encyclopedia article

Figure 1.

in alcohol with a blue color. When reducing substances are added to a suspension of Indophenol Blue in alkalized NaOH water, the dye turns into a leuko-derivative (Indophenol White) and passes into solution. A solution of Indophenol Blue in 70° alcohol dyes fats (Herxheimer). In microtechnique, the synthesis of Indophenol Blue (Ehrlich, Winkler, Schultze) from o-naphthol and dimethyl-p-phenylenediamine in the presence of air oxygen and oxidizing enzymes has important significance.

Cite this page

“Indophenols.” Soviet Medical Encyclopedia. English translation of Bolshaya Meditsinskaya Entsiklopediya, 1st ed. (Moscow, 1928–1936), ed. N. A. Semashko. https://sovietmedicalencyclopedia.pages.dev/article/indophenols/