Congo red , Indicator level , 573-58-0

Synonym(s):
Congo Red;Direct Red 28;Direct Red R;Direct Red Y;3,3?-[(1,1?-Biphenyl)-4,4?-diylbis(azo)]bis(4-amino-1-naphthalenesulfonic Acid) 2Na

CAS NO.：573-58-0

Empirical Formula: C32H22N6Na2O6S2

Molecular Weight: 696.66

MDL number: MFCD00004028

EINECS: 209-358-4

PRODUCT Properties

• Melting point: >360 °C (lit.)
• Density: 0.995 g/mL at 25 °C
• vapor pressure: <1 Pa
• storage temp.: Store at +5°C to +30°C.
• solubility: H2O: soluble10mg/mL
• form: Powder/Solid
• Colour Index: 22120
• pka: 4.1(at 25℃)
• color: Red Brown
• PH Range: 3(blue)-5.2(red)
• Odor: Odorless
• PH: 6.7 (10g/l, H2O, 20℃)
• Water Solubility: soluble
• λmax: 497nm, 488nm, 595nm
• Merck: 14,2498
• BRN: 3894858
• Stability: Stable. Incompatible with strong oxidizing agents.
• Biological Applications: Detecting bacteria,protein folding disorders; treating dermatological disorders,neurodegenerative diseases,Alzheimer’s disease
• Major Application: Waveguides, optical sensors, display devices, inks, fertilizer, pesticides, carbohydrates, treatment of pathogen infections, age-related macular degeneration
• CAS DataBase Reference: 573-58-0(CAS DataBase Reference)
• EPA Substance Registry System: Congo Red (573-58-0)

Description and Uses

C.I. Direct red 28(Congo Red) is an odorless,brownish-red powder. Molecular weight =698.72. Meltingpoint =359℃. Soluble in water; solubility =25 g/L at25℃.

Dye, medicine (diagnostic aid), indicator, biological stain.

Safety

• Symbol(GHS): GHS08
• Signal word: Danger
• Hazard statements: H350-H361d
• Precautionary statements: P201-P202-P280-P308+P313-P405-P501
• Hazard Codes: T,Xi
• Risk Statements: 45-63-36
• Safety Statements: 53-45-37/39-26
• WGK Germany: 3
• RTECS: QK1400000
• TSCA: Yes
• HS Code: 29215900
• Hazardous Substances Data: 573-58-0(Hazardous Substances Data)
• Toxicity: LD50 i.v. in rats: 190 mg/kg (Richardson, Dillon)