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Congo red solid and in water solution Congo red is an organic compound, the sodium salt of 3,3′- ( [1,1′-biphenyl]-4,4′-diyl)bis (4-aminonaphthalene-1-sulfonic acid). It is an azo dye. Congo red is water-soluble, yielding a red colloidal solution; its solubility is greater in organic solvents. The use of Congo red in the textile industry has long been abandoned, primarily because of its ...
The Congo Red stain is a vital histological tool widely used in pathology and biomedical research, primarily for detecting amyloid deposits in tissue samples. Known for its unique ability to exhibit apple-green birefringence under polarized light, Congo Red stain plays a crucial role in diagnosing diseases such as amyloidosis and Alzheimer's disease. Beyond amyloid detection, it is also ...
Congo red, first of the synthetic dyestuffs of the direct type, that is, not requiring application of a mordant (a substance such as tannin or alum used to fix the colour to cotton fibres). Introduced in 1884, Congo red belongs to a group of azo dyes derived from benzidine. Congo red was formerly used to dye cotton but has been superseded by dyes more resistant to light and to washing. It is ...
Staining with Congo Red (CR) is a qualitative method used for the identification of amyloids in vitro and in tissue sections. However, the drawbacks and artefacts obtained when using this dye can be found both in vitro and in vivo. Analysis of ...
Congo Red is the sodium salt of benzidinediazo-bis-1-naphthylamine-4-sulfonic acid; a diazo dye that is red in alkaline solution and blue in acid solution and used especially as an indicator and as a biological stain.
Congo red stain is the gold standard for the demonstration of amyloid in tissue sections Used to evaluate the presence and extent of amyloidosis in different organs Common diseases for Congo red stain include primary amyloidosis, amyloid light chain (AL) seen in plasma cell dyscrasias, amyloid A (AA) associated with inflammatory conditions
Congo Red had been around since the 1880s, and is a story by itself. Bayer wasn't interested when their chemist Paul Böttiger discovered the compound, so he patented it himself and sold it to rival AGFA.
Congo red remains the preferred method in many laboratories due to its balance of specificity, accessibility, and birefringence-based confirmation. Relevance In Diagnostic Pathology Congo red staining plays a crucial role in diagnosing amyloidosis, as identifying and characterizing amyloid deposits directly impacts clinical decision-making.
Congo red also shows a fluorescent activity when bound to amyloid fibrils, which tends to be used as a sensitive diagnosis tool for amyloidosis, instead of the traditional histological birefringence test. Diagnostic use In biochemistry and histology, congo red is used to stain microscopic preparates, especially as a cytoplasm and erythrocyte stain.
"Congo red" is not the name of a famous African explorer, but a dye that dates to 1883. It was synthesized by P. Böttiger as a textile dye, but it subsequently became more important as a pH indicator. It colors aqueous solutions blue below pH 3.0 and becomes red above pH 5.0. Recently, I. A ...