Ehrlich diazo reaction

Ehrlich diazo reaction
a reaction of a pure pink or red color resulting from the action of diazotized sulfanilic acid and ammonia upon certain aromatic substances, e.g., urobilinogen, found in the urine in some conditions. This reaction has diagnostic value in hepatic disease, typhoid fever, and measles and prognostic value in tuberculosis.

Medical dictionary. 2011.

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  • diazo reaction — n a reaction in which a diazo compound is made or used specif a reaction in various diseases (as typhoid fever) consisting of a red discoloration of the urine on addition of diazobenzenesulfonic acid * * * Ehrlich diazo r …   Medical dictionary

  • Ehrlich test — Ehrlich diazo reaction; see under reaction …   Medical dictionary

  • EHRLICH, PAUL — (1854–1915), German chemist, pioneer of modern histology, immunology, and chemotherapy; Nobel Prize winner. Ehrlich was born in Strehlen near Breslau. He studied at German universities and began his scientific work in 1878 in Berlin University as …   Encyclopedia of Judaism

  • reaction — 1. The response of a muscle or other living tissue or organism to a stimulus. 2. The color change effected in litmus and certain other organic pigments by contact with substances such as acids or alkalies; also the property that such substances… …   Medical dictionary

  • egg yellow reaction — the appearance of a yellow foam in an Ehrlich diazo reaction before the addition of ammonia, thought to indicate acute pneumonia …   Medical dictionary

  • Ehrlich — Paul, German bacteriologist, immunologist, and Nobel laureate, 1854–1915. See Ehrlichia, E. anemia, E. inner body, E. phenomenon, E. postulate, E. diazo reagent, E. theory, E. Türk line. See entries under stain; reaction …   Medical dictionary

  • diazobenzenesulfonic acid — di·azo·ben·zene·sul·fon·ic acid or chiefly Brit di·azo·ben·zene·sul·phon·ic acid .dī .az (.)ō .ben .zēn .səl .fän ik n a white or reddish crystalline acid derivative C6H4N2O3S of sulfanilic acid that is used as the reagent in the diazo reaction * …   Medical dictionary

  • sulfanilic acid — sul·fa·nil·ic acid or chiefly Brit sul·pha·nil·ic acid .səl fə .nil ik n a crystalline acid C6H7NO3S obtained from aniline and used esp. in making dyes and as a reagent * * * sul·fa·nil·ic ac·id (sul″fə nilґik) a white crystalline… …   Medical dictionary

  • Reagent — A substance used to produce a chemical reaction to detect, measure, produce, etc. other substances. * * * Any substance added to a solution of another substance to participate in a chemical reaction. [Mod. L. reagens] amino acid r. a r. used in… …   Medical dictionary

  • test — 1. To prove; to try a substance; to determine the chemical nature of a substance by means of reagents. 2. A method of examination, as to determine the presence or absence of a definite disease or of some substance in any of the fluids, tissues,… …   Medical dictionary

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