congo red


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congo red

[′käŋ·gō ′red]
(organic chemistry)
C32H22N6Na2O6S2 An azo dye, sodium diphenyldiazo-bis-α-naphthylamine sulfonate, used as a biological stain and as an acid-base indicator; it is red in alkaline solution and blue in acid solution.
References in periodicals archive ?
60-63) Congo red and thioflavins T and S stain amyloid but not the fibrils in fibrillary glomerulopathy.
11] But Bayer was soon rescued by the "discovery" of their own direct dye, actually only a minor chemical alteration of Congo red.
Nikon light excitation filters UV2A (330-380 nm) and B2A (450-490 nm) were used for observing the Calcofluor and Congo Red stains, respectively.
A 101 kilodalton heme- binding protein associated with congo red binding and virulence of Shigella flexenari and enteroinvasive Eschrichia coli strains.
According to ASTM 21152-67, an improved congo red method is used to rapidly measure the color performance of PVC.
The material stains negative for PAS, Congo red, and silver stains but exhibits immunoreactivity with anti-type-III collagen antibody.
The diagnosis of amyloidosis requires tissue biopsy, with Congo red immunohistochemical staining showing a pink or red colour under normal light and the classical apple-green birefringence under polarized light (Fig.
Evaluation often includes investigation of serum and urine for monoclonal light chains and a bone marrow biopsy as well as Congo red staining of an involved tissue or random abdominal fat or rectal biopsy.
It was also learnt that that the Congo Red Dot Test could be used as a marker for assessing misfolded proteins.
isolated from fresh water and to compare antibiotic resistance, plasmid profile, and phenotypic virulent strains by Congo red binding and production of hemolysin.
The colorimetric assay is quantitative and relies on an extractable colored ion-pair complex of oseltamivir with Congo red or bromochlorophenol blue.