• Chemical structure of Sudan IV (Scarlet Red; C.I. Solvent Red 24), CAS 85-83-6 BS Grade — fat-soluble bis-azo naphthol dye (lysochrome), the di-(o-tolyl) homologue of Sudan III bearing two ortho-methyl groups. Used as a histological lysochrome for the intense red staining of triglycerides, lipids and lipoproteins in frozen sections, including en-face staining of lipid-rich arterial plaques. Supplied by NorrChemica with DDP shipping. CoA and SDS provided.
  • NorrChemica reference card for Sudan IV (CAS 85-83-6, C.I. Solvent Red 24, "Scarlet Red"): structure, ~520 nm absorption in ethyl acetate, red-orange oil-soluble colour, optical data, and its lipid-staining, colorant and food-adulteration uses.
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NorrChemica™

Sudan IV

CAS 85-83-6 BS Grade

Sudan IV | CAS 85-83-6 | BS Grade

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Technical Specifications

CAS Number 85-83-6
EC / EINECS Number 201-635-8
MDL Number MFCD00003893
RTECS Number QL5775000
SMILES CC1=CC=CC=C1N=NC2=CC(=C(C=C2)N=NC3=C(C=CC4=CC=CC=C43)O)C
InChI InChI=1S/C24H20N4O/c1-16-7-3-6-10-21(16)26-25-19-12-13-22(17(2)15-19)27-28-24-20-9-5-4-8-18(20)11-14-23(24)29/h3-15,29H,1-2H3
InChIKey RCTGMCJBQGBLKT-UHFFFAOYSA-N
PubChem CID 62330
Molecular Formula C₂₄H₂₀N₄O
Molecular Weight 380.44 g/mol
Melting Point 199 °C (dec.)
Solubility Soluble in chloroform. Sparingly, mildly soluble in: benzene, acetone, ethanol. Insoluble in: water
Purity BS Grade
Physical Form Dark red to purple or brown to dark brown powder
HS Code 3204.19
Shelf Life Retest period: 36 months from date of manufacture
Storage Conditions Room Temperature (Recommended in a cool and dark place, <15°C)

Product Description & Scientific Applications

Sudan IV, also known as Oil Red IV and Solvent Red 24, is a fat-soluble disazo (bis-azo) lysochrome closely related to Sudan III. Its structure carries two methyl groups on the azo-linked rings, in contrast to the unmethylated Sudan III.

Common Scientific Applications

  • Histological lipid staining: A lysochrome for the staining of lipids, triglycerides, and lipoproteins on frozen sections. Paraffin-embedded sections cannot be used, because the ethanol and xylene baths of standard processing remove tissue lipids.
  • Atherosclerosis plaque mapping: Sudan IV and Oil Red O have both been used for many years to quantify lesions, though Oil Red O gives a more intense red for easier detection of lesional lipids. In atherosclerosis research, Sudan IV is applied to en face preparations of the aorta, staining lipid-rich plaques red to give a macroscopic map of plaque burden — a readout standard in apoE/LDLR-deficient mice, where stained plaque area is quantified as a percentage of the whole aorta.
  • Oil-soluble industrial colorant: Used commercially to colour plastics, textiles, waxes, heating oil, grease, and acrylic emulsions.
  • Food-adulteration reference standard: Although Sudan dyes are banned as food colorants, Sudan IV is added illegally to foods such as palm oil, and it therefore serves as an analytical reference standard for chromatographic and immunoassay screening of Sudan dyes.

Shipping Destinations

  • EU & UK: Priority delivery, 2–5 business days.
  • United States (DDP): 3–7 business days, duties and taxes prepaid.
  • EFTA Countries (DDP): 3–7 business days, duties and taxes prepaid.
  • Worldwide: 7–14 business days, selected locations.

Safety Information

GHS Pictograms
GHS07 Harmful/Irritant
Signal Word Warning
Hazard Class None — not subject to transport regulations
Transport Category Not classified as dangerous goods for transport (ADR/IATA/IMDG)
H-Statements H317
P-Statements P261 - P272 - P280 - P302+P352 - P333+P313 - P362+P364 - P501
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