What is the formula of Congo red?
C32H22N6Na2O6S2Congo red / Formula
What is Congo red stain used for?
Staining with Congo Red (CR) is a qualitative method used for the identification of amyloids in vitro and in tissue sections.
Who discovered Congo red?
Paul Bottinger
1 Chemistry of direct dyes. Congo Red, the first direct dye, was discovered in 1883 by Paul Bottinger, who was working as a dye chemist for the Friedrich Bayer Company in Ebersfeld, Germany (Garg and Nigam, 1981; Linke, 2006).
What color does Congo red turn in acid?
blue
The sponge had been saturated with congo red, an acid–base indicator which turns blue at a pH <3. and red at a pH >5.
Why is it called Congo red?
Conclusions: The Congo red stain was named “Congo” for marketing purposes by a German textile dyestuff company in 1885, reflecting geopolitical current events of that time.
What is the azo?
This medication is used to relieve symptoms caused by irritation of the urinary tract such as pain, burning, and the feeling of needing to urinate urgently or frequently. This drug does not treat the cause of the urinary irritation, but it can help relieve the symptoms while other treatments take effect.
What type of dye is Congo red?
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 is an indicator dye that is blue-violet at pH 3.0 and red at pH 5.0.
What is Congo red made 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.
What is the odor of Congo red?
No odor
Appearance Red-brown liquid. Molecular weight 696.68. Odor No odor. Specific Gravity 1.00 g/mL @ 20°C.
Is Congo red toxic?
Congo Red is an azo dye, it is toxic to many organisms and is a suspected carcinogen and mutagen. To give it its full name it is the disodium salt of 3,3′-(1E,1’E)-biphenyl-4,4′-diylbis(diazene-2,1-diyl)bis(4-aminonaphthalene-1-sulfonate). It is a benzidine-based anionic disazo dye.
What is azo good for?
Is azo safe?
You should not use AZO Urinary Pain Relief if you are allergic to it, or if you have kidney disease. To make sure AZO Urinary Pain Relief is safe for you, tell your doctor if you have: liver disease; diabetes; or.