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Congo red

   Also found in: Medical, Wikipedia 0.04 sec.
Congo red
n.
A brownish-red powder, C32H22N6Na2O6S2, used in medicine and as a dye, indicator, and biological stain.
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.congo red - a red-brown azo dye especially as a chemical pH indicator (congo red is red in basic and blue in acidic solutions)
solution - a homogeneous mixture of two or more substances; frequently (but not necessarily) a liquid solution; "he used a solution of peroxide and water"
acid-base indicator - an indicator that changes color on going from acidic to basic solutions
azo dye - any dye containing one or more azo groups


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16-18) Identification of amyloid is based on three criteria: (1) Congo red binding and green birefringence under polarized light, (19) (2) a fibril structure on electro microscopy, (20) and (3) confirmation of the characteristic cross beta-pleated sheet on x-ray crystallography and infrared spectroscopy.
Amyloid tumor of the larynx associated with plasma cell infiltration: ... by Maier, Wolfgang / Ear, Nose and Throat Journal
Sections stained with Congo red dye demonstrated the characteristic yellow and apple-green birefringence, and the lesion had the beta-pleated sheet structure and antiparallel conformation by low-angle x-ray diffraction, typical of amyloidosis.
Amyloidosis of the larynx by Hawkshaw, Mary / Ear, Nose and Throat Journal
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