Tropaeolin
Historical document, translated for reference. It reflects medical knowledge of the 1920s–30s and is not medical advice.
Summary
Tropaeolin refers to a series of acid azo dyes used in histological staining and for detecting blood impurities in biological samples. These water-soluble compounds produce yellow-orange background staining and have applications in both histological techniques and clinical diagnostics.
Encyclopedia entry (1928–1936)
Tropaeolin, a series of acid azo dyes: T. O and T. Y, derivatives of oxyazobenzene, T. 00 - derivative of phenylamidoazobenzene, T. 000 No. 1 and No. 2 - derivatives of anilazonaphthol, T. D - derivative of azobenzene. All T. are soluble in water and wine alcohol, with T. 000 being the most easily soluble. Tropaeolins stain as a background dye in yellow-orange color and are used, for example, in cartilage staining according to Wolters with methyl violet (chondrion masses are blue, the ground substance is yellow-orange). T. is also used to detect impurities of blood in feces, gastric juice, and vomit.
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“Tropaeolin.” Soviet Medical Encyclopedia. English translation of Bolshaya Meditsinskaya Entsiklopediya, 1st ed. (Moscow, 1928–1936), ed. N. A. Semashko. https://sovietmedicalencyclopedia.pages.dev/article/tropaeolin/