Congo Red

Congo Red

Synonyms Cotton Red; Benzo Congo Red; Direct Red 28; C.I. 22120; Sodium Diphenyldiazo-bis(alpha-NAPH-Thylaminesulfonate); Congo Red 4B; Cosmos Red; Direct Red R; Direct Red Y; Cotton Red B; Cotton Red C

CAS Number: 573-58-0 Molecular Formula: C32H22N6Na2O6S2 Molecular Weight: 696.664 g/mol

Beilstein Registry Number: 3894858 EC Number: 209-358-4 MDL Number: MFCD00004028

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SKU 02105099-CF
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Description

Product Description

Congo Red

Application Notes

In biochemistry and histology, congo red is used to stain microscopic preparates, especially as a cytoplasm and erythrocyte stain. It is used for the visual detection of amyloid in muscle and nerve fresh frozen sections in patients who have amyloidosis. Apple-green birefringence of Congo red stained preparates under polarized light is indicative for the presence of amyloid fibrils. Additionally, congo red is used in microbiological epidemiology to rapidly identify the presence of virulent serotype 2a Shigella flexneri, where the dye binds the bacterium's unique lipopolysaccharide (LPS) structure.

Usage Statement

Research Use Only (RUO). Unless otherwise stated in our catalog or other company documentation accompanying the product(s), our products are intended for research use only and are not to be used for any other purpose, which includes but is not limited to, unauthorized commercial uses, in vitro diagnostic uses, ex vivo or in vivo therapeutic uses or any type of consumption or application to humans or animals.

Key Applications

Detection of amyloid||Indicator in testing for free hydrochloric acid in gastric contents

Specifications
SKU 02105099-CF
Alternate Names Cotton Red; Benzo Congo Red; Direct Red 28; C.I. 22120; Sodium Diphenyldiazo-bis(alpha-NAPH-Thylaminesulfonate); Congo Red 4B; Cosmos Red; Direct Red R; Direct Red Y; Cotton Red B; Cotton Red C
Application Notes In biochemistry and histology, congo red is used to stain microscopic preparates, especially as a cytoplasm and erythrocyte stain. It is used for the visual detection of amyloid in muscle and nerve fresh frozen sections in patients who have amyloidosis. Apple-green birefringence of Congo red stained preparates under polarized light is indicative for the presence of amyloid fibrils. Additionally, congo red is used in microbiological epidemiology to rapidly identify the presence of virulent serotype 2a Shigella flexneri, where the dye binds the bacterium's unique lipopolysaccharide (LPS) structure.
Beilstein Registry Number 3894858
Color Index 22120
EC Number 209-358-4
Format powder
Hazard Statements H350-H361d
Applications Detection of amyloid||Indicator in testing for free hydrochloric acid in gastric contents
MDL # MFCD00004028
Melting Point >360 deg C
Molecular Formula C32H22N6Na2O6S2
Molecular Weight 696.664 g/mol
Personal Protective Equipment Eyeshields, full-face particle respirator, Gloves, respirator cartridge, respirator filter
pH SOLN HAVE PH OF 8-9.5
Physical Appearance Red Powder
Product Families Description Congo Red
Product Overview Congo Red
RTECS Number QK1400000
Safety Symbol GHS08
Solubility Sol in <a class="pubchem-internal-link CID-702" href="https://pubchem.ncbi.nlm.nih.gov/compound/ethanol">ethanol</a>; very slightly sol in <a class="pubchem-internal-link CID-180" href="https://pubchem.ncbi.nlm.nih.gov/compound/acetone">acetone</a>; practically insol in ether
Storage and Handling Store at Room Temperature(15-30 °C).
Usage Statement Research Use Only (RUO). Unless otherwise stated in our catalog or other company documentation accompanying the product(s), our products are intended for research use only and are not to be used for any other purpose, which includes but is not limited to, unauthorized commercial uses, in vitro diagnostic uses, ex vivo or in vivo therapeutic uses or any type of consumption or application to humans or animals.
UV Visible Absorbance λ max (water): 497 ± 3nm