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Congo red contains –NH 2 and –SO 3 functional groups The color of CR changes from red to blue in the presence of inorganic acids The change of color is due to the resonance between charged canonical structures ( Finar 1986 ) The red color is stable in the pH range of 5–10 ( Özcan and Özcan 2004 ) Figure 1 Molecular structure of CR.
Congo red definition of Congo red by Medical dictionary
Congo Red is an indicator dye that is blueviolet at pH 30 and red at pH 50 It contains a 33′ (biphenyl44’diyldidiazene21diyl)bis (4aminonaphthalene1sulfonate) It derives from a 33′ (biphenyl44’diyldidiazene21diyl)bis (4aminonaphthalene1sulfonic acid).
Adsorption of an anionic dye (Congo red) from aqueous
ChEBI An indicator dye that is blueviolet at pH 30 and red at pH 50 Biochem/physiol Actions Congo red is a benzidinebased anionic diazo dye It is a histological dye which binds to many amyloid proteins and is used for the quantification of amyloid βpeptide aggregation.
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Congo red is an organic compound the sodium salt of 33′ ( [11′biphenyl]44′diyl)bis (4aminonaphthalene1sulfonic acid) It is an azo dye Congo red is watersoluble yielding a red colloid al solution its solubility is greater in organic solvents.
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Instructions Remove one Congo Red test paper from the vial being careful not to touch the strip anywhere other than where you grasp it with your fingertips Dip the strip into the solution to be tested for 12 seconds and remove The Congo Red indicator remains blue below pH 30 then gradually turns to a brilliant red above pH 52 What you get.
