Trisodium 2-(4-Sulphophenylazo)-1,8-dihydroxynaphthalene-3,6-disulphonate (SPADNS) ≥80%, Sigma-Aldrich®

Supplier: SIGMA-ALDRICH MICROSCOPY

Synonyms: SPADNS, 2-(4-Sulphophenylazo)chromotropic acid trisodium salt, 4,5-Dihydroxy-3-(4-sulphophenylazo)-2,7-naphthalenedisulphonic acidtrisodium salt, 1,8-Dihydroxy-2-(4-sulphophenylazo)naphthalene-3,6-disulphonic acidtrisodium salt, Sulphanilic acid azochromotrope, 2-(p-sulphophenylazo)-1,8-Dihydroxy-3,6-Naphthalenedisulphonic acidtrisodium salt, Trisodium 1,8-Dihydroxy-2-(4-sulphophenylazo)naphthalene-3,6-disulphonate

M-Clarity™ quality level = MQ200

S9256-10G S9256-25G S9256-50G
S9256-10GEA 52.4 GBP
S9256-10G S9256-25G S9256-50G
Trisodium 2-(4-Sulphophenylazo)-1,8-dihydroxynaphthalene-3,6-disulphonate (SPADNS) ≥80%, Sigma-Aldrich®
Trisodium 2-(4-Sulphophenylazo)-1,8-dihydroxynaphthalene-3,6-disulphonate (SPADNS)

Sulfanilic acid azochromotrop. ≥80%

Formula: C₁₆H₁₂N₂O₁₁S₃
MW: 570,40 g/mol
Storage Temperature: Room Temperature
MDL Number: MFCD00003952
CAS Number: 23647-14-5
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Specification Test Results

Appearance (Form) Powder
Infrared spectrum Conforms to Structure
Carbon 26.0 - 35.0 %
Nitrogen 3.6 - 5.9 %
E1% ≥470
pH 7.0
Lambda Max 505 - 510 nm
Purity (HPLC) ≥80.0 %
Solubility (Colour) Red
Solubility (Turbidity)
50 mg plus 5 mL, H2O
Clear to Very Slightly Hazy

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